Transcript N.A. Sales Training Telcom Overview - ESET-Wiki

Littelfuse Training 2014
General Port Protection
Application Guides
1
AC / DC Power Applications
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
2
Block Diagram of Power Supply - AC Input and DC Output
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
3
Circuit Protection of AC Input
Design Notes:
Protection Application: Products that are directly connected to the AC mains
(120 to 250VACrms) will be exposed to severe surge transients (lightning, load
switching, etc.) and short circuit/overload conditions. Because of this, robust
protection devices should be selected.
Solution Description: Fuse: A cartridge or leaded fuse (Pico, 5x20mm, 2AG,
3AG, TE5/TR5) can be used for short circuit and overload current conditions. For
AC protection, the typical solutions would be 250V-rated 3AG/3AB fuses like the
325/326 series or the 5x20 fuses like the ceramic 215/216. For ratings that are
15A, 16A or 20A, LF now have a smaller footprint 5x20 solution in the 215 series
as an option to the 6x32 footprints of 326/325 series. For customers that are
used to using the TR/TE platform or in need of a smaller pitch, you could
consider the latest TE400 but its interrupt rating is 130A@250Vac only.
Radial MOV,
TVS Diode
OVP: For surge protection, an MOV or TVS Diode should be used. The MOV or
TVS Diode should be selected based on the expected severity (energy, voltage
and peak pulse current) of the transient surge. The specific family can be
determined after the surge severity is understood.
Regulatory Issues: Standards will vary depending on the product to be
protected. Examples include:
MOV Options:
CIII, Ultra MOV, LA Series
• IEC 61000-4-5
SMD TVS Diode Options:
P4SMA,SMAJ,P6SMB, SMBJ,SMC,SMD, SMF 200W,
and SDxxC
• UL1414
• UL1449
Unique Features: Does not apply.
Application Warnings: When selecting the fuse, be sure to consider the
expected temperature in the area around the fuse, as well as the in-rush
currents. Failure to take these factors into account may result in premature or
nuisance tripping of the fuse.
Axial Leaded TVS:
P4/6/1.5KE, 3KP~30KP, AK1~15
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
4
Circuit Protection of DC Output
Design Notes:
Protection Application: The DC output of the power supply
will experience less severe transient surges than the AC
input. For this reason, circuits where added protection is
desired, TVS diodes can be used. There will typically be
multiple DC circuits, including +3.3V, -5V, +5V, -12V and
+12VDC.
Solution Description: As shown at the left, a TVS diode can
be used to provide additional transient protection on each
DC output of the power supply. This will minimize the
transient stress on the power components on the respective
DC power buses.
See
Below
Companion Solutions: Does not apply.
Regulatory Issues: Standards will vary depending on the
product to be protected. Examples include:
SMD TVS Diode Options:
• IEC 61000-4-5
P4SMA,SMAJ,P6SMB, SMBJ,SMC,SMD, SMF 200W,
and SDxx
• UL1414
Axial Leaded TVS:
• UL1449
Unique Features: Does not apply.
P4/6/1.5KE, 3KP~30KP, AK1~15
Application Warnings: Does not apply.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
5
Circuit Protection of DC Input
Design Notes:
Cartridge Fuse:
477 or 505 Series
See Below
Protection Application: For customers that are using a PFC which changes
AC to DC directly in some of the high DC power supply circuits.
Solution Description: You would need to consider the 400Vdc 5x20 477
series. For customers that require a significantly higher DC interrupt-rating in
industrial or UPS applications. The small footprint 6x32 505 series , with a
breaking capacity of 10kA to 30kA@500Vdc for ratings from 16A to 30A,
would come in handy as well. The 477 and 505, being 5x20 and 6x32, are
smaller footprint options for DC protection.
sgs
Companion Solutions: NA
Regulatory Issues: Standards will vary depending on the product to be
protected. Examples include:
IEC 61000-4-5
UL1414
UL1449
MOV Options:
CIII, Ultra MOV, LA Series
Unique Features: The small footprint 6x32 505 series , with a breaking
capacity of 10kA to 30kA@500Vdc for ratings from 16A to 30A, would come
in handy. The 477 and 505, being 5x20 and 6x32, are smaller footprint
SMD TVS Diode Options:
P4SMA,SMAJ,P6SMB, SMBJ,SMC,SMD, and SMF
200W,
options for DC protection.
Axial Leaded TVS:
P4/6/1.5KE, 3KP~30KP, AK1~15
Application Warnings: When selecting the fuse, be sure to consider the
expected temperature in the area around the fuse, as well as the in-rush
currents. Failure to take these factors into account may result in premature
or nuisance tripping of the fuse.
Road Map Products to be Watching for: None
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
6
Circuit Protection of DC Input
Design Notes:
Protection Application: For portable devices that include an external AC
adapter, a DC voltage (typically in the range of 3.3VDC to 5VDC) will be
supplied to the unit. The electrical threats include ESD, low-level lightning
surges, and overcurrent conditions (short circuit or overload).
Solution Description: As shown at the left, a fuse or PTC can be used for
short circuit and overload current conditions. For surge and ESD protection,
a discrete diode can be used.
Companion Solutions: Other solutions exist in the SPA portfolio such as the
SP1007 Series 0402 and 0201 TVS Diodes.
Regulatory Issues: For ESD, the IEC 61000-4-2 will be the most appropriate
standard, and for lightning immunity the IEC 61000-4-5 may be consulted.
Unique Features: The SP1003 has ultra-low leakage of 100nA.
The SP1005 is 0201 form factor and capable of 10A of lightning-induced
surge (tP=8/20µs). The SDxx Series can handle up to 30A of lightninginduced surge (tP=8/20µs).
SMD TVS Diode Array Options:
SP1003-01ETG (0402)
SP1005-01ETG (0402)
SP1005-01WTG (0201)
SDxx-01FTG (0805)
Application Warnings: None
Road Map Products to be Watching for: N/A
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
7
Low Speed Applications
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
8
Circuit Protection of Keypads and Buttons
Design Notes:
Protection Application: The keypads and various buttons found on a cell phone
can be an entry way for ESD. These circuits are low-voltage DC switches,
typically less than 5VDC.
Solution Description: The examples shown at the left contain four lines for
demonstration purposes. The actual number will vary by application. In the top
example, discrete diodes are used to provide board layout flexibility. In the
bottom example, a single diode array is used to reduce part count.
Companion Solutions: Other solutions within the LF portfolio exist in addition to
these recommendations. For example, diode arrays with different channel
counts (2-5 lines) can be used to match the actual conditions of the cell phone.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard that
applies for these circuits. It supplies a test method for verifying that the end
product is not susceptible to ESD events.
Unique Features: SP1005 is 0201 form factor
Road Map Products to be Watching for: None
Potential Solutions
Ordering Number
ESD Level
I/O Capacitance @ VR=2.5V
Channels
VRWM
Packaging
SP1001-04XTG
±15kV
8pF
4
6V
SOT553
SP1001-04JTG
±15kV
8pF
4
6V
SC70-5
SP1011-04UTG
±15kV
7pF
4
6V
µDFN-6
SP1003-01ETG
±25kV
17pF
1
5V
SOD882
SP1005-01WTG
±30kV
23pF
1
6V
0201 Flipchip
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
9
Circuit Protection of Keypads and Switches
Design Notes:
Protection Application: The keypads and various
buttons found various applications can be an entry
way for ESD. These circuits are low-voltage DC
switches, typically less than 5VDC.
V5.5MLA0402 Multilayer Varistor (200pF)
Solution Description: The examples shown at the
left contain four lines for demonstration purposes.
The actual number will vary by application. In this
example, discrete multilayer varistors are used to
provide board layout flexibility.
Companion Solutions: Other solutions within the LF
portfolio exist in addition to these recommendations.
For example, MLV arrays (4 lines) can be used to
reduce part count and save board space.
Regulatory Issues: The IEC 61000-4-2 will be the
most appropriate standard that applies for these
circuits. It supplies a test method for verifying that
the end product is not susceptible to ESD events.
V5.5MLA0402
Unique Features: Does not apply.
Application Warnings: Does not apply.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
10
Circuit Protection of Audio Lines
Design Notes:
Protection Application: For the audio lines, the typical signal has maximum
value of 5.5 Vp-p, and has a maximum frequency less than 30kHz. At this
frequency, the capacitance of the suppressor does not need to be taken into
account. The electrical threat is ESD.
Solution Description: As shown at the left, silicon protection arrays or
discrete diodes can be used for layout flexibility. Bi-directional devices are
shown due to the analog nature of the audio signals. However, if the
negative signal does not exceed -0.3V, a unidirectional device may be used.
This usually occurs when the analog signal is biased “above” ground or 0V.
Companion Solutions: Several unidirectional arrays exist if applicable.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard
that applies for this port. It supplies a test method for verifying that the end
product is not susceptible to ESD events.
Unique Features: 0201 form factor, symmetrical BDV
Road Map Products to be Watching for: None
Potential Solutions
Ordering Number
ESD Level
I/O Capacitance @ VR=2.5V
Channels
VRW
Packaging
M
SP1002-02JTG
±8kV
5pF
2
6V
SC70-5
SP1005-01WTG
±30kV
23pF
1
6V
0201 Flipchip
SP1007-01WTG
±8kV
3.5pF
1
6V
0201 Flipchip
SP1004-04VTG
±8kV
5pF
4
6V
SOT953
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
11
Circuit Protection of Video Lines
Design Notes:
Protection Application: The video signals used in S-video and Composite video
formats vary between 0.5 and 2.0Vp-p, with a maximum frequency of 5MHz. At this
frequency, the capacitance of the suppressor needs to be taken into account. The
signal lines to be protected from ESD include Luminance and Chrominance for Svideo, and the single conductor for Composite video.
Solution Description: As shown at the left, bi-directional diodes can be used to
provide ESD protection to the video lines.
Companion Solutions: Other solutions within the LF portfolio exist in addition to
these recommendations. For example, if the board space usage needs to be
minimized, 0201 diodes can be used (SP1005 or SP1007).
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard that
applies for this port.
Application Warnings: The F-type connector shown at the left is specifically for set
top box-to-monitor video circuits. If the F-type connector is for CATV or Satellite
inputs, then lightning surges become a concern and MLVs cannot be used. In this
case, GDTs are required. See the page on CATV and Satellite inputs for more
details.
Unique Features: The SP1012-05WTG offers 5 channels in an 0402 sized package
Potential Solutions
Ordering Number
ESD Level
I/O Capacitance @ VR=2.5V
Channels
VRWM
Packaging
SP1002-02JTG
±8kV
5pF
2
6V
SC70-5
SP1004-04VTG
±8kV
5pF
4
6V
SOT953
SP1012-05WTG
±15kV
6.5pF
5
6V
Flipchip
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
12
Circuit Protection of Video Lines
V9MLA0402 / V5.5MLA0201 multilayer varistor
Design Notes:
Protection Application: The video signals used in S-video and Composite video
formats vary between 0.5 and 2.0Vp-p, with a maximum frequency of 5MHz. At this
frequency, the capacitance of the suppressor needs to be taken into account. The
signal lines to be protected from ESD include Luminance and Chrominance for Svideo, and the single conductor for Composite video.
Solution Description: As shown at the left, discrete multilayer varistors are
recommended for protection. Due to the analog nature of the video signals, unipolar TVS diode arrays are not recommended as the may clip the negative part of
the video signal.
Companion Solutions: Other solutions within the LF MLV portfolio exist in addition
to these recommendations. For example, if the manufacturing process cannot
handle 0402-size components, devices with the same characteristics can be found
in 0603-size components.
V9MLA0402 / V5.5MLA0201
multilayer varistor
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard that
applies for this port. It supplies a test method for verifying that the end product is
not susceptible to ESD events.
Unique Features: Does not apply.
Application Warnings: The F-type connector shown at the left is specifically for set
top box-to-monitor video circuits. If the F-type connector is for CATV or Satellite
inputs, then lightning surges become a concern and MLVs cannot be used. In this
case, GDTs are required. See the page on CATV and Satellite inputs for more
details.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
13
Circuit Protection of a Battery Pack
Design Notes:
Protection Application: The power bus of the battery pack should be protected against an
overcurrent runaway condition of the Li-ion cell, as well as from ESD. The control line
(e.g. SMBus, I2C, etc.) may also need to be protected against ESD. These are all low
voltage (<6VDC) circuits.
Solution Description: As shown at the left (top), discrete TVS diodes can be used for
layout flexibility with respect to ESD protection. An alternative (left, bottom) is to use a
single diode array to save part count. In both cases, the overcurrent solution can be a
strap (or SMD) resettable PTC, or an SMD chip fuse.
Companion Solutions: Other solutions exist in the SPA portfolio such as the SP100301ETG (0402, SOD882) and SDxx (0805, SOD323)
Regulatory Issues: With respect to safety of the battery pack, the following standards
supply test methods: UL 1642, UL 2054, IEC 61960, IEC 62133. With respect to ESD,
the IEC 61000-4-2 supplies a test method for verifying that the end product is not
susceptible to ESD events.
Unique Features: SP1005 is 0201 form factor and capable of 10A of surge (tP=8/20µs)
Application Warnings: Care should be taken during the PTC and fuse selection process
to ensure the proper performance of the overcurrent device. The key consideration is the
expected temperature of the battery pack as this will affect the trip point and trip time of
the overcurrent protector.
Potential Solutions
Ordering Number
ESD Level
I/O Capacitance @ VR=2.5V
Channels
VRW
Packaging
M
SP1003-01ETG
±25kV
17pF
1
5V
SOD882
SP1005-01WTG
±30kV
23pF
1
6V
0201 Flipchip
SP0503BAHTG
±30kV
30pF
3
5.5V
SOT143
SD05-01FTG
±30kV
300pF
1
5.0V
SOD323
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
14
Data Ports and High-Speed
Applications/Interfaces
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
15
Circuit Protection of a USB 1.1 Port
Design Notes:
Protection Application: The data signals used in a USB 1.1 port vary between
0V to +0.48V, with a maximum data rate of 12Mbps. At this data rate, the
capacitance of the suppressor needs to be taken into account. The signal
lines to be protected from ESD include D+ and D-. The 5VDC power bus
should be protected against ESD and overcurrent events.
Solution Description: As shown at the left, a discrete diode is used on the
power bus for ESD protection, and a PTC is used for resettable overcurrent
protection. For the data lines, a two-channel silicon protection array can be
used for board layout flexibility.
Companion Solutions: Other solutions within the LF portfolio exist in addition
to these recommendations. For example, if the operating current on the
power bus is higher or lower, an appropriately rated PTC can be chosen.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard
that applies for this port.
Potential Solutions
Ordering Number
ESD Level
I/O Capacitance @ VR=2.5V
Channels
VRWM
Packaging
SP1001-02JTG
±15kV
8pF
2
6V
SC70-3
SP1001-02XTG
±15kV
8pF
2
6V
SOT553
SP1003-01ETG
±30kV
17pF
1
5V
SOD882
SP0502BAJTG
±30kV
30pF
2
5.5V
SC70-3
SP0502BAHTG
±30kV
30pF
2
5.5V
SOT23-3
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
16
Circuit Protection of a USB 1.1 Port
Design Notes:
Protection Application: The data signals used in a USB 1.1 port vary between
-0.5V to +0.5V, with a maximum data rate of 12Mbps. At this data rate, the
capacitance of the suppressor needs to be taken into account. The signal
lines to be protected from ESD include D+ and D-. The 5VDC power bus
should be protected against ESD and overcurrent events.
Solution Description: As shown at the left, a multilayer varistor is used on the
power bus for ESD protect, and a PTC is used for resettable overcurrent
protection. For the data lines, discrete multilayer varistors can be used for
board layout flexibility, or to reduce part count, a single Diode array can be
used.
Companion Solutions: Other solutions within the LF portfolio exist in addition
to these recommendations. For example, if the operating current on the
power bus is higher or lower, an appropriately rated PTC can be chosen.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard
that applies for this port. It supplies a test method for verifying that the end
product is not susceptible to ESD events.
Unique Features: Does not apply.
Application Warnings: Does not apply.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
17
Circuit Protection of a USB 2.0 Port
Design Notes:
Protection Application: The data signals used in a USB 2.0 port vary between 0V to
+0.48V, with a maximum data rate of 480Mbps. At this data rate, the capacitance of
the suppressor needs to be minimized. The signal lines to be protected from ESD
include D+ and D-. The 5VDC power bus should be protected against ESD and
overcurrent events.
Solution Description: As shown at the left, a PTC is used for resettable overcurrent
protection while the data lines and power bus are protected from ESD with a twochannel diode array (1pF).
Companion Solutions: Other solutions within the LF portfolio exist in addition to
these recommendations. For example, if the operating current on the power bus is
higher or lower, an appropriately rated PTC can be chosen.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard that
applies for this port. It supplies a test method for verifying that the end product is not
susceptible to ESD events.
Unique Features: The SP3014-02UTG has the lowest dynamic resistance in the
industry today for market leading protection of state of the art IC geometries.
Potential Solutions
Ordering Number
ESD Level
I/O Capacitance @ VR=1.65V
Channels
VRWM
Packaging
SP3014-02UTG
±15kV
1.0pF
2
5V
uDFN-6
SP3003-02XTG
±8kV
0.65pF
2
6V
SOT553
SP0504SHTG
±12kV
0.85pF
4
6V
SOT23-6
SP3030-01ETG
±20kV
0.5pF
1
5V
SOD882
SP1003-01ETG
±30kV
17pF
1
5V
SOD882
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
18
Circuit Protection of a USB 2.0 Port
Design Notes:
Protection Application: The data signals used in a USB 2.0 port vary between
-0.5V to +0.5V, with a maximum data rate of 480Mbps. At this data rate, the
capacitance of the suppressor needs to be minimized. The signal lines to be
protected from ESD include D+ and D-. The 5VDC power bus should be
protected against ESD and overcurrent events.
Solution Description: As shown at the left, a multilayer varistor is used on the
power bus for ESD protect, and a PTC is used for resettable overcurrent
protection. For the data lines, discrete PulseGuard® suppressors can be used
for board layout flexibility, or to reduce part count, a single PulseGuard array
can be used.
Companion Solutions: Other solutions within the LF portfolio exist in addition
to these recommendations. For example, if the operating current on the
power bus is higher or lower, an appropriately rated PTC can be chosen.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard
that applies for this port. It supplies a test method for verifying that the end
product is not susceptible to ESD events.
Unique Features: Does not apply.
Application Warnings: Does not apply.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
19
Circuit Protection of a USB 3.0 Port
Design Notes:
Protection Application: USB3.0 adds two new data pair to the legacy D± pair
namely SSTX+, SSTX-, SSRX+, and SSRX-. These new super-speed lines
will operate at a maximum data rate of 5Gbps while the old D± will operate at
a maximum of 480Mbps. At these data rates, the capacitance needs to be
minimized. The signal lines need to be protected from ESD, and the 5VDC
power bus should be protected against ESD and overcurrent events.
Solution Description: As shown at the upper left, a PTC is used for resettable
overcurrent protection while the super-speed data lines are protected with an
ultra-low capacitance diode array. Furthermore, another diode array is used
for ESD protection of D± as well as the power bus.
Companion Solutions: Other solutions within the LF portfolio exist such a fully
integrated six channel protection array (lower left) to further minimize part
count and simplify the board design.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard
that applies for this port.
Road Map Products to be Watching for:
SP3015 Series: Ultra-Low Capacitance (0.3pF) Diode Array
Potential Solutions
Ordering Number
ESD Level
I/O Capacitance @ VR=1.65V
Channels
VRWM
Packaging
SP0524PUTG
±12kV
0.5pF
4
5V
µDFN-10
SP3014-02UTG
±15kV
1.0pF
2
5V
uDFN-6
SP3012-06UTG
±12kV
0.5pF
6
5V
µDFN-14
SP3030-01ETG
±20kV
0.5pF
1
5V
SOD882
SP3022-01xTG
±20kV
0.35pF
1
5V
SOD882 & 0201 Flipchip
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
20
Circuit Protection of a USB 3.0 Port
USB 3.0 Port
1206L150
V5.5MLA0201 /
V5.5MLA0402
Design Notes:
VBUS
Protection Application: USB3.0 adds two new data pair to the legacy D+/Dpair namely SSTX+, SSTX-, SSRX+, and SSRX-. These new super-speed
lines will operate at a maximum data rate of 5Gbps while the old D+/D- will
operate at a maximum of 480Mbps. At these data rates, the capacitance of
the suppressor needs to be minimized. The signal lines need to be protected
from ESD, and the 5VDC power bus should be protected against ESD and
overcurrent events.
D+
DSSDX+
SSDX SSRX+
SSRX -
(6) PGB1010402 /
PGB1010603
Signal
Ground
Solution Description: As shown at the upper left, a PTC is used for resettable
overcurrent protection while the super-speed data lines are protected with
PulseGuard polymer ESD suppressors.
Shield
Ground
USB 3.0 Port
1206L150
V5.5MLA0201 /
V5.5MLA0402
Companion Solutions: Other solutions within the LF portfolio exist such as
0201 PGBs for space constrained applications.
VBUS
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard
that applies for this port. It supplies a test method for verifying that the end
product is not susceptible to ESD events.
D+
DSSDX+
SSDX -
Unique Features: Does not apply.
SSRX+
SSRX -
Application Warnings: Does not apply.
(3) PGB102ST23
Signal
Ground
Shield
Ground
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
21
Circuit Protection of a HDMI Port
Design Notes:
Protection Application: The data signals used in High Definition
Multimedia Interface ports vary between approximately 2.5V and 3.5V,
and have a data rate up to 3,400Mbps. The signal lines to be protected
from ESD include D0±, D1±, D2±, CLK±.
Solution Description: Due to the extremely high rate of data transfer,
the capacitance of the ESD suppressor must be minimized. As shown
at the left, two ultra-low capacitance (0.5pF) silicon protection arrays
can be used.
Companion Solutions: Alternatively, combinations of single channel,
dual channel, and even six channel devices could be used as needed.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate
standard that applies for this port. It supplies a test method for verifying
that the end product is not susceptible to ESD events.
Unique Features: Ultra-low capacitance, flat over DC bias
Potential Solutions
Ordering Number
ESD Level
I/O Capacitance @ VR=1.65V
Channels
VRWM
Packaging
SP0524PUTG
±12kV
0.5pF
4
5V
µDFN-10
SP3014-02UTG
±15kV
1.0pF
2
5V
uDFN-6
SP3012-06UTG
±12kV
0.5pF
6
5V
µDFN-14
SP3030-01ETG
±20kV
0.5pF
1
5V
SOD882
SP3022-01xTG
±20kV
0.35pF
1
5V
SOD882 & 0201 Flipchip
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
22
Circuit Protection of a HDMI Port
Design Notes:
Protection Application: The data signals used in High Definition
Multimedia Interface ports vary between approximately 2.5V and 3.5V,
and have a data rate of 1,600Mbps. The signal lines to be protected
from ESD include R+, R-, G+, G-, B+, B-, Cl+ and Cl-.
PGB1010603 / PGB1010402
Solution Description: Due to the extremely high rate of data transfer,
the capacitance of the ESD suppressor must be minimized. As shown
at the left, discrete PulseGuard® suppressors can be used for board
layout flexibility, or to reduce part count, array versions can be used.
Companion Solutions: Does not apply.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate
standard that applies for this port. It supplies a test method for verifying
that the end product is not susceptible to ESD events.
Unique Features: The PulseGuard solution has the industry’s lowest
capacitance value. This feature ensures that it will maintain the signal
integrity of high-speed data ports.
Application Warnings: Does not apply.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
23
Circuit Protection of DisplayPort
Design Notes:
Protection Application: Each port has a main link which contains 4
differential pairs or lanes (i.e. ML0±, ML1±, ML2±, and ML3±). The total
throughput is 10.8Gbps or 2.7Gbps per lane, and the clock signal is
embedded in the lanes and does not exist separately as in HDMI
There is also an auxiliary channel (AUX±), hot plug detect (HPD), and
power pin (PWR).
Solution Description: Due to the high rate of data transfer, the
capacitance of the ESD suppressor must be minimized. As shown at the
left, two ultra-low capacitance (0.5pF) silicon protection arrays can be
used.
Companion Solutions: Alternatively, combinations of single channel, dual
channel, and even six channel devices could be used as needed.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate
standard that applies for this port. It supplies a test method for verifying
that the end product is not susceptible to ESD events.
Unique Features: Ultra-low capacitance, flat over DC bias
Potential Solutions
Ordering Number
ESD Level
I/O Capacitance @ VR=1.65V
Channels
VRWM
Packaging
SP0524PUTG
±12kV
0.5pF
4
5V
µDFN-10
SP3014-02UTG
±15kV
1.0pF
2
5V
uDFN-6
SP3012-06UTG
±12kV
0.5pF
6
5V
µDFN-14
SP3030-01ETG
±20kV
0.5pF
1
5V
SOD882
SP3022-01xTG
±20kV
0.35pF
1
5V
SOD882 & 0201 Flipchip
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
24
Circuit Protection of a 1394 Port
Design Notes:
Protection Application: IEEE 1394 uses a low-voltage differential signaling system
operating between 1.20V to 2.00V, with a maximum data rate of 400 Mbps (1394a)
to 1,600 Mbps (1394b). At these data rates, the capacitance of the suppressor
needs to be minimized. The signal lines to be protected against ESD include TPA±,
and TPB±. The 30VDC power bus should be protected against ESD and
overcurrent events.
Solution Description: As shown at the left, a multilayer varistor is used on the
power bus for ESD protection, and a PTC is used for resettable overcurrent
protection. For the data lines, SP3003-04 protection array can be used.
Companion Solutions: Other solutions within the LF portfolio exist in addition to
these recommendations. For example, leaded PTCs can be substituted for the SMD
versions and several other options exist in the TVS Diode Array portfolio.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard that
applies for this port. It supplies a test method for verifying that the end product is
not susceptible to ESD events.
Application Warnings: It is recommended that only resettable protection devices
like PTCs be used on hot-plug ports like 1394.
Potential Solutions
Ordering Number
ESD Level
I/O Capacitance @ VR=1.65V
Channels
VRWM
Packaging
SP3003-04ATG
±8kV
0.65pF
4
6V
MSOP-10
SP0524PUTG
±12kV
0.5pF
4
5V
µDFN-10
SP3014-02UTG
±15kV
1.0pF
2
5V
uDFN-6
SP3030-01ETG
±20kV
0.5pF
1
5V
SOD882
SP3022-01xTG
±20kV
0.35pF
1
5V
SOD882 & 0201 Flipchip
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
25
Circuit Protection of a 1394 Port
Design Notes:
Protection Application: IEEE 1394 uses a low-voltage differential signaling system
operating between 1.20V to 2.00V, with a maximum data rate of 400 Mbps (1394a) to
1,600 Mbps (1394b). At these data rates, the capacitance of the suppressor needs to
be minimized. The signal lines to be protected against ESD include TPA+, TPA-, TPB+
and TPB-. The 30VDC power bus should be protected against ESD and overcurrent
events.
Solution Description: As shown at the left, a multilayer varistor is used on the power
bus for ESD protection, and a PTC is used for resettable overcurrent protection. For the
data lines, discrete PulseGuard® suppressors can be used for board layout flexibility, or
to reduce part count, a single PulseGuard array can be used.
Companion Solutions: Other solutions within the LF portfolio exist in addition to these
recommendations. For example, leaded PTCs can be substituted for the SMD versions,
or a TVS diode can be substituted for the MLV.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard that
applies for this port. It supplies a test method for verifying that the end product is not
susceptible to ESD events.
Unique Features: Does not apply.
Application Warnings: It is recommended that only resettable protection devices like
PTCs be used on hot-plug ports like 1394.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
26
Circuit Protection of a eSATA Port
Design Notes:
Protection Application: eSATA is a subset of the SATA protocol that uses 2
differential pairs for communication. Four lines need to be protected per port (i.e.
TX± and RX±), and currently eSATA is capable of running raw data rates of
1.5Gbps (Gen 1) and 3.0Gbps (Gen 2)
Solution Description: As shown at the left, a SP0524P TVS Diode Array an be used
for ESD protection as that’s the mostly likely threat.
Companion Solutions: Other solutions within the LF portfolio exist in addition to
these recommendations. For example, several other options exist in the TVS Diode
Array portfolio and some are included below.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard that
applies for this port. It supplies a test method for verifying that the end product is
not susceptible to ESD events.
Application Warnings: Does not apply.
Potential Solutions
Ordering Number
ESD Level
I/O Capacitance @ VR=1.65V
Channels
VRWM
Packaging
SP0524PUTG
±12kV
0.5pF
4
5V
µDFN-10
SP3014-02UTG
±15kV
1.0pF
2
5V
uDFN-6
SP3030-01ETG
±20kV
0.5pF
1
5V
SOD882
SP3022-01xTG
±20kV
0.35pF
1
5V
SOD882 & 0201 Flipchip
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
27
Circuit Protection of a CATV/Satellite Input
Design Notes:
Protection Application: The broadcast signals carried by the CATV and Satellite
inputs operate in the radio frequency range. The frequencies extend up to 1,000
MHz for CATV and 2,500 MHz for Satellite. Due to the high frequency nature of
these signals, the capacitance of the suppressor must be taken into account to avoid
signal attenuation. The electrical threats will be lightning surges and ESD.
Solution Description: As shown at the left, a single gas discharge tube is used to
protect the input signal line. The specific part number is determined by matching the
surge’s peak pulse current value to that of the appropriate GDT.
Typical GDT used for CATV: 145V/150V/230V.
Regulatory Issues: Since this input is susceptible to lightning transients, standards
such as UL 1449 and IEC 61000-4-5 should be consulted for test conditions.
Typically, the 8x20s waveform is used.
Unique Features: Because of GDT’s low self-capacitance of typ. 0.5 to 1 pF, GDT
does not disturb the system even at high frequencies. It is recommended to ground
either the shielding or conductor.
Application Warnings: PulseGuard® suppressors also have very low capacitance
values, but should not be used on this input line. The PulseGuard devices are not
robust enough to protect against lightning transients; they are specifically designed
for ESD protection.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
28
Circuit Protection of an Antenna
Design Notes:
Protection Application: The majority of real-time data signals
carried by antennas operate at radio frequency levels. As an
example, Bluetooth operates at 2.4GHz. Due to the high frequency
nature of these signals, the capacitance of the suppressor must be
taken into account to avoid signal attenuation. The electrical threat
will be ESD.
Solution Description: Most all applications will require the ultra-low
capacitance of a PulseGuard® suppressor (and higher standoff
voltage) to protect the antenna element but some lower voltage
applications like Bluetooth, will only require a 5V standoff.
Companion Solutions: For FM antennas in smart phones, mobile
phones, or MP3 players the SP1007 Series SPA could be used
(shown to the left) and for Bluetooth antennas the SP3022 Series
can be used.
Regulatory Issues: The IEC 61000-4-2 will be the most
appropriate standard that applies for this circuit. It supplies a test
method for verifying that the end product is not susceptible to ESD
events.
Unique Features: 0201 form factor, symmetrical BDV
Potential Solutions
Ordering Number
ESD Level
I/O Capacitance @ VR=2.5V
Channels
VRWM
Packaging
SP1007-01WTG
±8kV
3.5pF
1
6V
0201 (Flipchip)
SP3022-01xTG
±20kV
0.35pF
1
5V
SOD882 & 0201 Flipchip
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
29
Circuit Protection of an Antenna
Design Notes:
Protection Application: The real-time data signals carried by the
antenna operate at radio frequency levels. As an example,
Bluetooth operates at 2.4 GHz. Due to the high frequency nature of
these signals, the capacitance of the suppressor must be taken
into account to avoid signal attenuation. The electrical threat will
be ESD.
Solution Description: As shown at the left, a single PulseGuard®
suppressor is used to protect the antenna element.
Companion Solutions: For space-constrained applications, an
0402 or 0201 version is currently available.
PGB1010402 /
PGB1010603
Regulatory Issues: The IEC 61000-4-2 will be the most
appropriate standard that applies for this circuit. It supplies a test
method for verifying that the end product is not susceptible to ESD
events.
Unique Features: Does not apply.
Application Warnings: Does not apply.
Road Map Products to be Watching for: Does not apply
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
30
Circuit Protection of an LCD Module
Design Notes:
SP6002-04
Protection Application: For typical LCD modules, the data transfer rate is less than 20
Mbps, so protection devices with capacitance values less than 40 pF can be used. The
electrical threat is ESD and potentially EMI (Electromagnetic Interference).
Solution Description: As shown at the top left, a multi-channel EMI Filter can be sued for
ESD protection and filtering of frequencies in the cellular band (800-3000MHz).
SP6002-06
Companion Solutions: Other solutions within the Silicon Protection Array portfolio exist.
For example, if EMI is not a concern, then any multi-channel silicon protection array can
be used or ESD protection (bottom left). Furthermore, if data transfers (e.g. MDDI) take
place at high speeds (>1,000 Mbps), then a silicon protection array with low capacitance
should be used to maintain signal integrity (i.e. SP300x).
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate
standard that applies for this port.
Unique Features: SP600x Series integrate between 20-40 components into a single pkg
Potential Solutions
Ordering Number
ESD Level
Line Capacitance @ VR=2.5V
Channels
VRWM
Packaging
SP6002-04UTG-1
±30kV
30pF
4
5V
µDFN-8
SP6002-06UTG-1
±30kV
30pF
6
5V
µDFN-12
SP6003-04UTG-1
±12kV
14pF
4
5V
µDFN-8
SP6003-06UTG-1
±12kV
14pF
6
5V
µDFN-12
SP1001-04XTG
±15kV
8pF
4
5V
SOT553
SP1001-04JTG
±15kV
8pF
4
5V
SC70-5
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
31
Circuit Protection of a Touchscreen
Design Notes:
Protection Application: There are many different types of touchscreens (i.e. resistive,
capacitive, optical, etc) and each may require unique protection schemes. The electrical
threat is ESD the majority of the time.
Solution Description: As shown at the left, a multi-channel array can be used for ESD
protection.
Companion Solutions: Other solutions within the Silicon Protection Array portfolio exist
such as the SP1011-04UTG and the SP1012-05WTG which has the densest form factor
in the market today.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate
standard that applies for this port.
Unique Features: The SP1012 integrates 5 channels of protection in a 0402 sized
footprint for space constrained applications found in consumer prodcuts.
Potential Solutions
Ordering Number
ESD Level
Line Capacitance @ VR=2.5V
Channels
VRWM
Packaging
SP3002-04UTG
±12kV
0.85pF
4
6V
µDFN-6
SP1012-05WTG
±15kV
6.5pF
5
6V
Flipchip
SP3030-01ETG
±20kV
0.5pF
1
5V
SOD882
SP3022-01xTG
±20kV
0.35pF
1
5V
SOD882 & 0201 Flipchip
SP1011-04UTG
±15kV
7pF
4
6V
µDFN-6
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
32
Circuit Protection of a Sensor Input
Design Notes:
Protection Application: The sensor input provides an interface between
the patient and the measurement circuits. The electrical threat will be
ESD.
Solution Description: As shown at the left, a single TVS diode is used to
protect the sensor input.
Companion Solutions: The SP1005 and SP1007 Series could also be
used if a smaller form factor is needed.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate
standard that applies for this circuit. It supplies a test method for verifying
that the end product is not susceptible to ESD events.
Unique Features: The SP1003 has ultra-low leakage of 100nA.
Application Warnings: None
Road Map Products to be Watching for: None
Potential Solutions
Ordering Number
Surge
(tP=8/20µs)
ESD Level
I/O Capacitance @ VR=2.5V
Channels
VRWM
Packaging
SP1003-01ETG
7A
±25kV
17pF
1
5V
SOD882
SP1005-01WTG
10A
±30kV
23pF
1
6V
0201 Flipchip
SP1005-01ETG
8A
±30kV
23pF
1
6V
SOD882
SP1007-01WTG
2A
±8kV
3.5pF
1
6V
0201 Flipchip
SP1007-01ETG
2A
±8kV
3.5pF
1
6V
SOD882
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
33
Circuit Protection of a RS-232 Port
Design Notes:
Protection Application: The signals used in an RS-232 port can vary
between ±24V (MAX), but typically the signal swing is limited to ±12V with a
maximum data rate of 256kbps. Since this is a low-speed system, the
capacitance of the suppressor is not a concern. The signal lines to be
protected from ESD include RD, TD, RTS, CTS and sometimes DSR and
DTR as well.
Solution Description: As shown at the left, a SM15 diode array can be used
for signal swings of 15V, but for higher voltage implementations the SM24
or SM36 can be considered.
Companion Solutions: Other solutions within the LF portfolio exist in
addition to these recommendations. For example, if the signal swing is only
between +5V and GND most any SPA would be acceptable (example 2x
SP0503BAHTG).
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate
standard that applies for this port. It supplies a test method for verifying that
the end product is not susceptible to ESD events.
Potential Solutions
Ordering
Number
Surge
(tP=8/20µs)
ESD Level
I/O
Capacitance
Channels
VRWM
Packaging
SM15-02HTG
17A
±30kV
75pF
1
15V
SOT23-3
SM24-02HTG
7A
±30kV
65pF
1
24V
SOT23-3
SP724AHTG
3A
±8kV
3pF
4
20V
SOT23-6
SP725ABTG
14A
±8kV
5pF
4
30V
SOIC-8
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
34
Circuit Protection of a RS-232 Port
Design Notes:
Protection Application: The RS-232 standard (also known as RS-232-C)
allows signals up to -±24, but many applications will only drive to +5 volts
and ground. The maximum data rate is 20kbps. Since this is a low-speed
system, the capacitance of the suppress is not a concern. The signal lines
to be protected from ESD and lightning induced surges for inter-building
type applications include RD (receive data), TD (transmit data), RTS
(Request To Send), CTS (Clear To Send), DSR (Data Set Ready) and
DTR (Data Terminal Ready). This interface is also known as a V.24 or V.28
port.
Solution Description: As shown at the left, the Q12A/SAMC SIDACtor
devices can be used for intra-building applications while the Q22C/SCMC
would be used for high exposure environment applications.
Companion Solutions: Other solutions within the LF portfolio exist in
addition to these recommendations. For example, if the signal voltages will
be limited in the range from -5V to +5V, then an MLV with a lower operating
voltage can be chosen.
Potential Solutions
Regulatory Issues: The IEC 61000-4-5 for outdoor applications will be the
most appropriate standard that applies for this port. It supplies a test
method for verifying that the end product is not susceptible to lightning
induced surge events.GR-1089 and ITU K.20 or K.21 may also apply.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
35
Circuit Protection of a RS-485 Port
Design Notes:
Protection Application: The maximum bus voltage for a RS-485 link is
+12V and -7 V with a maximum data rate of 10 Mbps. Since this is a
relatively low-speed system, the protection load capacitance is not a
relative concern. The signal lines to be protected from the three threats
identified below are the A & B signal lines.
Solution Description: As shown at the bottom left, three discrete
SIDACtor devices (P0300Q22L) in either QFN packages or DO-214
packages can be used for a minimum PCB footprint solution when surge
is the primary threat. The SM712-02HTG shown at the upper left was
designed specifically for RS-485 consisting of 2 channels with a 12V and
7V standoff voltage in the positive and negative direction, respectively,
and should be used when ESD and low level surge is the primary threat.
Regulatory Issues: The IEC 61000-4-2 (ESD Immunity), 4-4 (EFT
Immunity), & 4-5 (surge immunity) are the three most common standards
that a RS-485 interface must withstand.
Unique Features: SIDACtor crowbarring technology.
Companion Solutions: P0300Q12AL, P0300SAL
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
36
Circuit Protection of a CAN/LIN Bus
Design Notes:
Protection Application: Most applications involve two wires (i.e. CANH and
CANL) and depending on cable length, data rates can vary from 10kbps1Mbps The common mode voltage can differ in the particular application
from -2V to 7V or up to -12V to 12V. The latter case is shown to the left
where we assume the full signal swing is 24V.
Solution Description: The SM24CANA and SM24CANB can withstand up
to 24V in either direction (i.e. bidirectional) and should be used for ESD
and low level surge suppression.
Regulatory Issues: The IEC 61000-4-2 (ESD Immunity), 4-4 (EFT
Immunity), & 4-5 (surge immunity) are the most common standards that
will apply and both products are AEC-Q101 qualified for automotive
applications.
Unique Features: Does not apply.
Companion Solutions: Discrete options like the SDxx and SDxxC Series
can be considered as alternatives and are also AEC-Q101 qualified.
Potential Solutions
Ordering Number
Surge
(tP=8/20µs)
ESD Level
I/O
Capacitance
Channels
VRWM
Packaging
SM24CANA-02HTG
3A
±24kV
11pF
2
24V
SOT23-3
SM24CANB-02HTG
10A
±30kV
30pF
2
24V
SOT23-3
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
37
Circuit Protection of a SIM or µSIM Socket
Design Notes:
Protection Application: The SIM (Subscriber Identification Module) card
has 3 data lines that are medium-speed and low-voltage. Given the low
speed of the signals, the capacitance is not a major concern.
Solution Description: The SP1011 and SP1012 are ideal form factors for
this socket measuring 1.25x1mm and 0.94x0.6mm, respectively.
Regulatory Issues: The IEC 61000-4-2 (ESD Immunity) is the main focus
as the biggest threat is ESD from the removal and replacing of SIM cards.
Unique Features: Does not apply.
Companion Solutions: Other solutions and form factors in the TVS Diode
Array portfolio exist.
Potential Solutions
Ordering Number
ESD Level
Line Capacitance @ VR=2.5V
Channels
VRWM
Packaging
SP1011-04UTG
±15kV
7pF
4
6V
µDFN-6
SP1012-05WTG
±15kV
6.5pF
5
6V
Flipchip
SP3022-01xTG
±20kV
0.35pF
1
5V
SOD882 & 0201 Flipchip
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
38
Telecommunication
Applications/Interfaces
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
39
Central Office (CO) Block Diagram
Overview Notes:
Central Office (CO) : This connects the Public Switched
Telephone Network (PSTN) to the customer through a SLIC
function. This CO also connects the customer to the internet
via the VDSL2/ADSL2 transceiver unit. This CO Site could be
a Remote Terminal (RT) located in a neighborhood or it could
be a building location up to 18,000 feet away. The further a
customer is from this CO function, the lower the xDSL rate will
be. LF has solutions targeted for the SLIC, Transceiver Units
and the splitter at this CO location. A CO will also contain
T1/E1/J1 trunks, which LF presents solutions for also.
Remote Site = Customer Premises Equipment (CPE): The
customer premises in this diagram shows the Plain Old
Telephone Service (POTS), better known as voice services,
along with xDSL services. A splitter function will also be
located at the CP site. LF has solutions for the POTS
interface, the splitter, and the xDSL transceiver unit.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
40
POTS Circuit Protection
Design Notes:
P3100 and TeleLink fuse
Protection Application: POTS interfaces such as telephones, fax
machines, and 56k modems need protection from lightning induced
surges.
Solution Description: Generally this interface will require the P3100
or P3500 due to battery voltage and ringing signals. In some
applications, lower threshold devices may be appropriate.
Companion Solutions: The “A” rated version may be used if a PPTC
is placed out front instead of the TeleLink fuse. These solutions are
available in QFN, DO-214, and TO-92 packages.
Regulatory Issues: The most typical requirement for POTS type
interfaces is TIA-968-B and CS03, which is the Canadian version of
TIA-968. This was formerly known as FCC Part 68. The ITU K.21
Recommendation would be applicable for non- N.A. applications
while the YD/T 1082 would apply for Mainland China. Verizon
requirements for CPE are more robust for this interface so a “C”
rated solution is required. Many of these applications will also be UL
listed for safety so UL 60950-1 will apply for N.A.
Potential Solutions
Road Map Products to be Watching for: Does not apply
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
41
POTS Circuit Protection
P3100Sx and P0640Sx
This could be an analog modem interface, telephone interface, or a fax machine interface application.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
42
ADSL2/VDSL2 Circuit Protection
Inter-building (per GR-1089) Protection Scheme
Design Notes:
SDP3100Q38CB and TeleLink PPTC
Protection Application: The VDSL2/ADSL2 broadband signals can
extend up to a 30 MHz bandwidth; therefore, capacitance loading is
very important in these applications. VDSL2 can have signals as high
as 29 volts p-p that are superimposed on battery voltage and ringing
voltage for a combination POTS/DSL service line. Therefore, a high
threshold SIDACtor device is typically selected..
Solution Description: The SDP3100Q38CB is a biased solution that
does NOT interfere with the DSL signaling scheme and avoids the
inter-modulation distortion issues for most solid-state solutions
offered in this slot. A low off-state resistance PPTC can be used
preceding it for ITU K.20 and K.21 Recommendations..
Regulatory Issues: These xDSL ports and protection scheme should
comply with the Inter-building requirements of GR-1089 for N.A.
applications. Internationally, the application should comply with ITU
K.20 or K.21 Recommendation and in Mainland China with YD/T 993
or YD/T 950 or YD/T 1082. The UL/IEC/EN 60950-1 standards will
generally demand the need for the TeleLink or PTC.
Potential Solutions
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
43
ADSL2/VDSL2 Circuit Protection
Intra-building (per GR-1089) Protection Scheme
Design Notes:
Protection Application: The VDSL2/ADSL2 broadband signals can
extend up to a 30 MHz bandwidth; therefore, capacitance loading is
very important in these applications. VDSL2 can have signals as high
as 29 volts p-p that are superimposed on battery voltage and ringing
voltage for a combination POTS/DSL service line. Therefore, a high
threshold SIDACtor device is typically selected..
Solution Description: The SDP3100Q38CB is a biased solution that
does NOT interfere with the DSL signaling scheme and avoids the
inter-modulation distortion issues for most solid-state solutions
offered in this slot. A low off-state resistance PPTC can be used
preceding it for ITU K.20 and K.21 Recommendations..
Regulatory Issues: These xDSL ports and protection scheme should
comply with the Intra-building requirements of GR-1089 for N.A.
applications. Internationally, the application should comply with ITU
K.20 or K.21 Recommendation and in Mainland China with YD/T 993
or YD/T 950 or YD/T 1082. The UL/IEC/EN 60950-1 standards will
generally demand the need for the TeleLink or PTC.
Potential Solutions
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
44
DSL Splitter Circuit Protection
P3100Q12B/SB, P0300SA/Q12A and TeleLink Fuse
Design Notes:
Protection Application: This circuit provides a high pass filter design
for the CPE side of an ADSL application. It provides isolation
between the voice channel of the POTS line and the data channel
intended for the ADSL modem.
Solution Description: The P3100Q38B is a non-biased solution but is
compatible with many lower rate DSL services or DSL services with
very short reach requirements. A low off-state resistance PPTC can
be used preceding it for ITU K.20 and K.21 Recommendations..
Regulatory Issues: These xDSL splitters should comply with the Intrabuilding or the Inter-building requirements of GR-1089 for N.A.
applications. Internationally, the application should comply with ITU
K.20 or K.21 Recommendation and in Mainland China with YD/T 993
or YD/T 950 or YD/T 1082. The UL/IEC/EN 60950-1 standards will
generally demand the need for the TeleLink or PTC.
Potential Solutions
Ordering Number
VS @ 100V/us
(VMAX)
VRDM @ IDRM=5uA
(VMIN)
P0300SCLRP
40
25
P0300SAMCLRP
40
25
P3100SBLRP
350
275
P3500SBLRP
400
320
P0300Q12BLRP
40
25
P0300Q12ALRP
40
25
P3100Q12BLRP
350
275
P3500Q12BLRP
400
320
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
45
SLIC/FXO/FXS VoIP Overview
Overview Notes:
VoIP: A VoIP (voice over IP) application will utilize a SLIC
function to provide the analog interface to the telephone, an
Ethernet port for data and/or digitized voice connections to
specialized data phones, and an FXO (Foreign eXchange
Office) port to interface with the Public Switched Telephone
Network (PSTN) In CPE, the FXS circuit is located in the
gateway.
This specific block diagram includes the FXO port, which
provides lifeline support, call congestion handling (if the packet
network via the Ethernet port is not available), and remote
VoIP dialing (i.e. receiving calls through the analog PSTN port
and forwarding them to the VoIP network). Not all VoIP
applications will contain an FXO port. Some rely solely on the
packet network connection via the Ethernet port.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
46
SLIC Circuit Protection
Design Notes:
Protection Application: The SLIC chipset provides the dial tone, battery
voltage, ringing voltages, and other interfacing functions between the end
user and the telcom network. Many variants of SLIC chipsets are offered in
the market place. .
P0721DF-1E and 600R150 PPTC
Solution Description: This is a fixed voltage protector that does NOT require
an additional capacitor as the programmable protectors require. The surge
rating of this device is lower than the programmable devices; therefore, it is
generally used with a leading PTC device and is intended mainly for intrabuilding applications.
Companion Solutions:.Pxxx1DF-1, Pxxx1UAL/UCL, Pxxx1Q22CL,
Pxxx1CA2L, Pxxx1SAL/SCL,
Regulatory Issues: These SLIC ports should comply with the Intra-building or
the Inter-building requirements of GR-1089 for N.A. applications.
Internationally, the application should comply with ITU K.20 or K.21
Recommendation and in Mainland China with YD/T 993 or YD/T 950 or YD/T
1082. The UL/IEC/EN 60950-1 standards will generally demand the need for
the TeleLink or PTC.
Potential Solutions
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
47
SLIC Circuit Protection
Design Notes:
B1101UCL and TeleLink Fuse
Protection Application: The SLIC chipset provides the dial tone, battery voltage,
ringing voltages, and other interfacing functions between the end user and the
telcom network. Many variants of SLIC chipsets are offered in the market place. .
Solution Description: This dual-channel ProSLIC chipset is a self-ringing SLIC,
which means it internally generates the ringing signal. The OVP solution shown
will track with the reference voltage of this self-ringing SLIC. This solution also
includes the integrated diode for positive surge protection.
Companion Solutions: B1101UC4 (one package instead of two packages as
shown to the left), 600R150 PPTC, Regular TeleLink fuse, B1xxCAL/CCL..
Regulatory Issues: These SLIC ports should comply with the Intra-building or the
Inter-building requirements of GR-1089 for N.A. applications. Internationally, the
application should comply with ITU K.20 or K.21 Recommendation and in
Mainland China with YD/T 993 or YD/T 950 or YD/T 1082. The UL/IEC/EN
60950-1 standards will generally demand the need for the TeleLink or PTC.
Potential Solutions
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
48
SLIC Circuit Protection
B1101UC4L and Enhanced TeleLink Fuse
Design Notes:
Protection Application: The SLIC chipset provides the dial tone, battery voltage,
ringing voltages, and other interfacing functions between the end user and the
telcom network. Many variants of SLIC chipsets are offered in the market place. .
Solution Description: This is a two chipset self-ringing SLIC. The OVP solution
shown will track with the reference voltage of this self-ringing SLIC. A single
protection package for two SLIC chipsets results in a lower cost since only one
reference capacitor is required. This solution also includes the integrated diode.
Companion Solutions: B1101UC (two packages instead of a single package
solution as shown to the left, which may offer more PCB layout options),
600R150 PPTC, Regular TeleLink fuse, B1xxxCAL/CCL(but extra diode needed).
Regulatory Issues: These SLIC ports should comply with the Intra-building or the
Inter-building requirements of GR-1089 for N.A. applications. Internationally, the
application should comply with ITU K.20 or K.21 Recommendation and in
Mainland China with YD/T 993 or YD/T 950 or YD/T 1082. The UL/IEC/EN
60950-1 standards will generally demand the need for the TeleLink or PTC.
Potential Solutions
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
49
SLIC LCAS Circuit Protection
P0641SAL, A1220UAL and TeleLink Fuse
Design Notes:
Protection Application: The SLIC chipset provides the dial tone, battery voltage,
ringing voltages, and other interfacing functions between the end user and the
telcom network. The LCAS provides the ringing signal so that a self-ringing SLIC
is not required.
Solution Description: This is a fixed voltage protector that does NOT require an
additional capacitor as the programmable protectors require. It also includes an
asymmetrical SIDACtor device to protect the LCAS relay (.different turn on
voltages tip to ground then ring to ground).
Companion Solutions:.Pxxx1DF-1E, Pxxx1DF-1, Pxxx1UAL/UCL, Pxxx1Q22CL,
Pxxx1CA2L, Pxxx1SCL, 600R150.
Regulatory Issues: These SLIC ports should comply with the Intra-building or the
Inter-building requirements of GR-1089 for N.A. applications. Internationally, the
application should comply with ITU K.20 or K.21 Recommendation and in
Mainland China with YD/T 993 or YD/T 950 or YD/T 1082. The UL/IEC/EN
60950-1 standards will generally demand the need for the TeleLink or PTC.
Potential Solutions
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
50
DS-1 Overview
Overview Notes:
DS-1: The DS-1 interface is known as a T1 trunk
line in N.A., as a J1 trunk line in Japan, and as an
E1 trunk line in the remaining parts of the globe.
This is a four-wire system with a TX pair and a RX
pair used for data rates up to 1.544 Mbps for nonE1 and 2.058 Mbps for E1 and J1 trunk lines. The
signaling voltage is typically 2.4 volts to 3.6 volts
but due to imbalances in the line, signal reflections
can occur, which could cause the signals to be as
high as 12 volts. This sets the minimum threshold
for the protection devices. However, for systems
that are repeatered (regenerator term is actually
the correct term), phantom powering is used. This
is normally ± 130 volts; therefore, the minimum
turn-on for OVP needs to be much higher.
Furthermore, TIA-968-A (soon to be TIA-968-B)
requires an insulation barrier, so any OVP
connected longitudinally (common mode) must
have a stand-off voltage greater than 169 volts.
The P1800 series fits this perfectly.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
51
DS1 (T1/E1/J1) Trunk Circuit Protection
P0080Q12AL, P3206UCL and the TeleLink Fuse
Design Notes:
Protection Application: A DS1 port has several nomenclatures
used in the telcom industry. The T1 trunk is a 1.544 Mbps
baseband connection used in North America, while the E1 is a
2.0 Mbps connection used in the rest of the world except for
Japan, where the term is J1. The data signal is very low but
IF a regenerator system is used, then higher threshold surge
suppression is required.
Solution Description: The line side of this port will require a
robust solution while the chip-side can implement lower surge
rated protection. The TeleLink fuse is compatible with this
baseband signaling scheme and is necessary for the
application to comply with power fault conditions.
P1800SDL and the PPTC
Companion Solutions:.A2106UCL, P2106UCL, P1800Q22CL,
P0640Q22CL, 600R150, P1800SDL
Regulatory Issues: N.A. ports will typically need to comply
with GR-1089 (Issue 6), TIA-968-B in some cases, and UL
60950-1. European and other non-Mainland China
installations will need to comply with ITU K.20 and IEC 609501. Mainland China installations will need to comply with YD/T
1082 or YD/T 950. ports Some customers may ask for
compliance to he IEC 61000-4-5.
P1800Q22C, SP03-6 and the PPTC
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
52
DS3 (T3/E3/J3) Trunk Circuit Protection
Design Notes:
P0642SAL and Fuse
Protection Application: The signals used in an DS3 application are low but the
data rate is 45 Mbps. Therefore a low capacitance protection solution is needed
for these applications
.
Solution Description: A DS3 interface is typically an intra-building application, so
the “A” rated device will suffice. The entire list of “A” devices shown in the
possible solutions below are also available in a “B” rating for more robust surge
requirements.
Regulatory Issues: For intra-building applications, the GR-1089 intra-building
requirements, ITU K.20 or K.21 Basic Recommendations apply. . From a safety
perspective, UL/EN/IEC 60950-1 would apply.
Potential Solutions
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
53
DS3/DS4/DS5 (Tx/Ex/Jx) Trunk Circuit Protection
Design Notes:
LC03 (x2), SP3051, and the TeleLink Fuse
Protection Application: T-carrier infers NA and South KR while Ecarrier infers Europe and J-carrier for Japan.
DS2 = T2 (6Mbps), E2 (8Mbps), J2 (6Mbps)
DS3 = T3 (44Mbps), E3 (34Mbps), J3 (32Mbps)
DS4 = T4 (274Mbps), E4 (139Mbps), J4 (97Mbps)
DS5 = T5 (400Mbps), E5 (565Mbps), J5 (565Mbps)
The data rates go up with each successive version and hence the
importance of using lower capacitance solutions.
Solution Description: The line side of this port will require a
robust solution while the chip-side can implement lower surge
rated protection. The key is to use lower capacitance devices like
the LC03 and SP3051 TVS Diode Arrays. The TeleLink fuse is
compatible with this baseband signaling scheme and is
necessary for the application to comply with power fault
conditions.
Potential Solutions
Ordering
Number
Surge
(tP=8/20µs)
ESD
Level
I/O
Capacitance
Lines
VRWM
Packaging
LC03-3.3BTG
150A
±30kV
4.5pF
2
3.3V
SOIC-8
SP3051-04HTG
20A
±30kV
3.5pF
4
6V
SOT23-6
SP2504NUTG
20A
±30kV
2pF
4
2.5V
uDFN-10
SP3304NUTG
20A
±30kV
2pF
4
3.3V
uDFN-10
PROTECT
CONTROL
SENSE
Companion Solutions: Many other solutions/combinations exist
in the diode array portfolio, and SIDACtor devices can be used on
the line side for outdoor applications where a 500A surge
immunity is required.
Regulatory Issues: N.A. ports will typically need to comply with
GR-1089 (Issue 6), TIA-968-B in some cases, and UL 60950-1.
European and other non-Mainland China installations will need to
comply with ITU K.20 and IEC 60950-1. Mainland China
installations will need to comply with YD/T 1082 or YD/T 950.
ports Some customers may ask for compliance to he IEC 610004-5.
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
54
HDSL Overview
Overview Notes:
HDSL: A High-bit Digital Subscriber Line (HDSL)
transceiver is a common replacement for T1 trunk
lines because the HDSL needs ONLY two lines to
accomplish what T1 trunks do over four lines. It is
a 1.544 Mbps baseband connection used in North
America with less crosstalk issues for nearby
bundled cables. The data signal is very low but IF
a regenerator system is used, then higher
threshold surge suppression is required.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
55
HDSL Trunk Circuit Protection
P2300Q22 and the TeleLink Fuse
Design Notes:
Protection Application: A HDSL trunk is a 1.544 Mbps baseband connection used
in North America. The data signal is very low but the power for the repeaters can
be as high as ±190 volts. IF a regenerator system is used, then higher threshold
surge suppression is required.
Solution Description: The line side of this port will require a robust solution while
the chip-side can implement lower surge rated protection. The TeleLink fuse is
compatible with this baseband signaling scheme and is necessary for the
application to comply with power fault conditions.
Regulatory Issues: N.A. ports will typically need to comply with GR-1089 (Issue 6
soon to be released), TIA-968-B in some cases, and UL 60950-1.
Potential Solutions
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
56
Cell Site Block Diagram
Potential Solutions
oAK6 or AK10 Series
o DC Power to radio heads
oSEP series
o Protection of xDSL or T/E/J Carrier
oP1800’s
o Protection of xDSL, T/E/J Carrier, POTS
oGDTs
o Protection of xDSL, POTS
o Diode Arrays
o Ethernet, T/E/J Carrier
Or Ethernet
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
57
Ethernet Applications
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
58
Ethernet (10/100/1000BaseT) Overview
Overview Notes:
10Base-T
Ethernet: Ethernet is a Local Area Network (LAN) that was standardized as
IEEE 802.3. There are four dominant forms in the marketplace today with more
on the horizon. These are 10Base-T, 100Base-T, 1000Base-T, and 10GBase-T
(Base stands for Baseband signaling, T stands for twisted pair, 10 = 10 Mbps,
100 = 100 Mbps, 100 = 1000 Mbps, 10G = 10Gbps). All the standards use UTP
(Unshielded Twisted Pair) wiring or cabling such as CAT5, CAT5e, CAT6, and
CAT7. Ethernet connections are typically made with a RJ45 type connector,
which is also known as the IEC 60603-7 8P8C modular connector.
The main difference between the four forms of Ethernet is the speed (see table
at right). In general, the signaling scheme became more complex to achieve the
higher data rates. Figure 2 shows the differences in eye diagrams between a
100Base-T and 1000Base-T signal. The 10Base-T eye diagram was omitted
since it is a simpler, two-level signal. With this basic understanding of Ethernet
we will now move into an introduction of Power-over-Ethernet which can be
used in conjunction with any of the aforementioned standards.
Data Rate
10 Mbps
Symbol Rate
20Mbaud with 0.5bits/baud
2 pairs out of the 4 available are used
(1 for transmit and 1 for receive)
Differential (i.e. 2 levels)
4B5B NRZ Manchester (four bits are scrambled and sent as a 5 bit
sequence)
CAT3 or higher up to 100M
Data Pairs
Signaling
Encoding
Cabling
100Base-T (also known as Fast Ethernet)
Data Rate
100 Mbps
Symbol Rate
125Mbaud with 0.8bits/baud
2 pairs out of the 4 available are used (one pair for transmit and one
pair for receive)
Differential with MLT-3 (Multi Level Transition)
4B5B NRZ Manchester (four bits are scrambled and sent as a 5 bit
sequence)
CAT5 or higher up to 100M
Data Pairs
Signaling
Encoding
Cabling
1000Base-T
100Base-TX
1000Base-Tx
Data Rate
1000 Mbps
Symbol Rate
125Mbaud with 2bits/baud
Data Pairs
4 pairs (full duplex) each pair carries 250 Mbps
Signaling
Differential PAM-5 (Pulse Amplitude Modulation five-level) signaling
Encoding
8B/10B
Cabling
Preferably CAT5e or higher up to 100M
10GBase-T (10GbE)
Data Rate
10 Gbps
Symbol Rate
800M symbols/s
Data Pairs
Encoding
4 pairs (full duplex)
Differential PAM-16 (Pulse Amplitude Modulation sixteen-level)
signaling with CRC-8
DSQ128 (yields 3.5 bits per symbol)
Cabling
Preferably CAT6 up to 55M or CAT6A/7 up to 100M
Signaling
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
59
Power-over-Ethernet (PoE) Overview
Overview Notes:
PoE is a powering technique used over the existing Ethernet wiring
link. IEEE standard 802.3af specifies the technical requirements so
that systems are compatible with one another. The IEEE 802.3at
specification provides the guidelines for PoE+, which is a higher
power level than the original PoE. Both of these specifications allow
the Ethernet wiring to carry both data and DC power. This removes
the need for a local ac power port for each individual Ethernet
interface. PoE can also provide a continuous power source thus
supporting life-line capabilities for IP enabled telephones such as may
be seen in EFM (Ethernet in the First Mile) or IEEE 802.3ah or Active
Ethernet applications. This is also known as Ethernet to the Home
(ETTH). Life-line in this case meaning that the telephone is not
dependent on a local power supply, so that it functions during local
power outages. EFM needs this capability in order to provide life-line
service to residential locations so PoE is an ideal implementation for
EFM applications.
Here are two major advantages for PoE:
--Ethernet devices are not required to be placed next to wall outlets
and reduces the need for “wall-warts”
--Power cables are no longer required to be laid out for the network
This power can be inserted from (1) an endpoint PSE or (2) a midspan PSE. The legacy Ethernet systems most likely use a mid-span
PSE method. For new installations, the endpoint PSE is the most
economical and easiest installation choice. Power can be provided in
one of two ways over CAT5e, CAT6, or CAT7 cable:
Mode A
Mode A power is applied over the “active” data pair found in 10BaseT or
100BaseTX interfaces. In these type systems, two pair are used for data
delivery (RJ-45 pins: 1-2 and 3-6) and two pair are unused (pairs 4-5 and 7-8).
This is shown in Figure 3 below. PoE uses the “phantom powering” technique
so that a single pair carries a zero DC volt potential difference. The two center
tap connections provide access to the DC power and the DC voltage across
any single pair (i.e. 1-2 or 3-6) remains at zero volts. This scheme helps to
prevent accidental shock hazards when single pairs are handled.
Mode B
Mode B power is applied over the unused pair (pairs 4-5 and 7-8) for 10BaseT
and 100BaseT interfaces. This is shown in Figure 4 below. For 1000BaseT
and 10GbE applications, all wire pairs are used for data transfer, therefore
there are no “spare pairs” available. So a 1000BaseT and 10GbE system may
use either Mode A or Mode B power but the 4-5 and 7-8 pair would be center
tap connected instead of directly connected. Mode B can be used with any
Ethernet application as can Mode A. The PD end must be compatible with
both Mode A and Mode B since its final application is not known. The PSE
defines the Mode type, therefore it provides power in a single mode only; it
cannot provide power in both Mode A and Mode B simultaneously.
Over the same pair used for data signaling in 10BaseT and 100BaseT
systems, or over the unused pair in 10BaseT and 100BaseT systems.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
60
Circuit Protection of an Ethernet Port
ESD Only (Short LAN Connections)
Design Notes:
Protection Application: The data signals used in an Ethernet port vary between
1.0V (1000Base-T and 100Base-TX) to 2.5V (10Base-T), with maximum data
rates of 1000Mbps, 100Mbps and 10Mbps, respectively. At these data rates, the
capacitance of the suppressor needs to be taken into account. The signal lines to
be protected from ESD include Tx± and Rx±.
SP0504SHTG
Solution Description: As shown at the left, a diode array can be used to protect
the data lines of the Ethernet port from ESD.
Companion Solutions: Other solutions within the LF portfolio exist such as other
potential four channel silicon protection arrays (listed below). Alternatively, if the
design engineer knows that no additional capacitance can be added to the
system, the PulseGuard® suppressor family can be consulted.
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard that
applies for this port.
Application Warnings: The protection scheme is only for Ethernet ports that
connect to a LAN and will only be exposed to ESD. If the Ethernet network will
include access to the outside of the building, then more stringent standards apply
to take into account lightning surges. Please see the following slides.
Potential Solutions
Note: For 1GbE (1000Base-Tx)
the protection scheme should
replicated for the other 4 lines.
Ordering Number
ESD Level
I/O Capacitance @ VR=1.65V
Lines
VRWM
Packaging
SP0504SHTG
±12kV
0.85pF
4
6V
SOT23-6
SP3002-04JTG
±12kV
0.85pF
4
6V
SC70-6
SP3004-04XTG
±12kV
0.85pF
4
6V
SOT563
SRV05-4HTG
±20kV
2.0pF
4
6V
SOT23-6
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
61
Circuit Protection of an Ethernet Port
ESD, EFT, and Low Level Lightning (Indoor Short Haul)
Design Notes:
Protection Application: The data signals used in an Ethernet port vary between
1.0V (1000Base-T and 100Base-TX) to 2.5V (10Base-T), with maximum data
rates of 1000Mbps, 100Mbps and 10Mbps, respectively. At these data rates, the
capacitance of the suppressor needs to be taken into account. The signal lines to
be protected from ESD include Tx± and Rx±.
SRV05-4HTG
Solution Description: As shown at the left, a diode array can be used to protect
the data lines of the Ethernet port from ESD, EFT, and low level surges due to
short wiring.
Companion Solutions: Other solutions within the LF portfolio exist such as other
potential four channel silicon protection arrays (listed below).
Regulatory Issues: The IEC 61000-4-2 will be the most appropriate standard that
applies for this port.
Application Warnings: The protection scheme is only for Ethernet ports that
connect to a LAN and will only be exposed to ESD, EFT, and low level surges. If
the Ethernet network will include access to the outside of the building, then more
stringent standards apply to take into account lightning surges. Please see the
following slides.
Potential Solutions
Note: For 1GbE (1000Base-Tx)
the protection scheme should
replicated for the other 4 lines.
Ordering
Number
Surge
(tP=8/20µs)
ESD
Level
I/O
Capacitance
Lines
VRWM
Packaging
SRV05-4HTG
10A
±20kV
2pF
4
6V
SOT23-6
SP3051-04HTG
20A
±30kV
3.5pF
4
6V
SOT23-6
SP2504NUTG
20A
±30kV
2pF
4
2.5V
uDFN-10
SP3304NUTG
20A
±30kV
2pF
4
3.3V
uDFN-10
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
62
Circuit Protection of an Ethernet Port
Lightning, ESD, EFT, CDE, Power Fault (Indoor Long-Haul)
Design Notes:
Protection Application: The data signals used in an Ethernet port vary
between 1.0V (1000Base-T and 100Base-TX) to 2.5V (10Base-T), with
maximum data rates of 1000Mbps, 100Mbps and 10Mbps, respectively. At
these data rates, the capacitance of the suppressor needs to be taken into
account. The signal lines to be protected from lightning include Tx± and Rx±.
LC03-xBTG, SP3051-04HTG, Telelink Fuse
Solution Description: As shown at the left, Telelink fuses are used for overcurrent protection for each data line. The LC03x diode array can be used for
primary protection of the Ethernet port from lightning per the GR-1089 intrabuilding standard (100A, 2/10µs). Additionally, the SP3051, a low
capacitance diode array, is used for secondary protection to suppress any letthrough energy that gets coupled through the transformer.
Companion Solutions: Other solutions within the LF portfolio exist in addition
to these recommendations. For example, if PoE or PoE+ is being used, the
SEP Series (shown on the following slide) could be in place of the LC03.
Regulatory Issues: Many standards could apply depending upon the end
equipment usage such as GR-1089 or the IEC61000-4-5. Please consult
Littelfuse for additional application support.
Potential Solutions
Note: For 1GbE (1000Base-Tx)
the protection scheme should
replicated for the other 4 lines.
Ordering
Number
Surge
(tP=8/20µs)
ESD
Level
I/O
Capacitance
Lines
VRWM
Packaging
LC03-3.3BTG
150A
±30kV
4.5pF
2
3.3V
SOIC-8
SP03-6BTG
150A
±30kV
8pF
2
6V
SOIC-8
SP3051-04HTG
20A
±30kV
3.5pF
4
6V
SOT23-6
SP2504NUTG
20A
±30kV
2pF
4
2.5V
uDFN-10
SP3304NUTG
20A
±30kV
2pF
4
3.3V
uDFN-10
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
63
Circuit Protection of an Ethernet Port
Lightning, ESD, EFT, CDE, Power Fault (Outdoor Long-Haul)
Design Notes:
SEP0640Q38CB, SP3304NUTG, Telelink Fuse
Protection Application: The data signals used in an Ethernet port vary
between 1.0V (1000Base-T and 100Base-TX) to 2.5V (10Base-T), with
maximum data rates of 1000Mbps, 100Mbps and 10Mbps, respectively. At
these data rates, the capacitance of the suppressor needs to be taken into
account. The signal lines to be protected from lightning include Tx± and
Rx±.
Solution Description: As shown at the left, Telelink fuses are used for overcurrent protection for each data line, and the SEP series SIDACtor can be
used for primary protection from lightning per the GR-1089 inter-building
standard (500A, 2/10µs). The SEP064 has a working or standoff voltage of
58V allowing it be used in PoE and PoE+ applications. Last, a low
capacitance diode array is used for secondary protection to suppress any
let-through energy. A 3.3V device is shown but there also 2.5 or even 5V
options to match the PHY.
Companion Solutions: Other solutions within the LF portfolio exist in addition
to these recommendations such as the SEP008 series. This lower voltage
option can lower the clamping voltages in applications that do not need the
higher standoff voltage due to PoE and PoE+ applications.
Regulatory Issues: Many standards could apply depending upon the end
equipment usage such as GR-1089 or the IEC61000-4-5. Please consult
Littelfuse for application support.
Note: For 1GbE (1000Base-Tx)
the protection scheme should
replicated for the other 4 lines.
Potential Solutions
Ordering Number
Surge (tP=2/10µs)
I/O Capacitance @ VR=0V
Lines
VRWM
Packaging
SEP0640Q38CB
500A
See datasheet
2
58V
QFN (5x6mm)
SEP0080Q38CB
500A
See datasheet
2
6V
QFN (5x6mm)
SP3304NUTG
20A
2pF
4
3.3V
uDFN-10
SP2504NUTG
20A
2pF
4
2.5V
uDFN-10
PROTECT
SP3051-04HTG
CONTROL
20A SENSE
Confidential
and Proprietary 4to Littelfuse.6VLittelfuse, Inc.6V
© 2014
3.5pF
64
Circuit Protection of an Ethernet Port
Lightning, ESD, EFT, CDE, Power Fault (General or Basic Protection)
Design Notes:
Protection Application: The data signals used in an Ethernet port vary between 1.0V
(1000Base-T and 100Base-TX) to 2.5V (10Base-T), with maximum data rates of
1000Mbps, 100Mbps and 10Mbps, respectively. At these data rates, the
capacitance of the suppressor needs to be taken into account. The signal lines to be
protected from lightning include Tx± and Rx±.
SLVU2.8-4BTG
Solution Description: As shown at the left, the customer may decide to forego
primary protection and depend on the transformer to act as a “buffer” to the incoming
surge. For lightning protection, a low capacitance diode array is used on the
secondary side to suppress any let-through energy that gets coupled through the
transformer. This solution would need to be verified during testing since various
transformers will allow different amounts of energy to be coupled through to the PHY.
Also note, that the SLVU2.8-4BTG will only protect against differential surge events
or transients. The other devices listed below would protect against differential and
common mode events assuming the GND pin is connected to PHY GND.
Companion Solutions: Other solutions within the LF portfolio exist some of which are
shown below.
Regulatory Issues: Many standards could apply depending upon the end equipment
usage such as GR-1089 or the IEC61000-4-5. Please consult Littelfuse for
application support.
Note: For 1GbE (1000Base-Tx)
the protection scheme should
replicated for the other 4 lines.
Potential Solutions
Ordering Number
Surge (tP=8/20µs)
I/O Capacitance @ VR=0V
Channels
VRWM
Packaging
SLVU2.8-4BTG
40A
4.0pF
4
2.8V
SOIC-8
SP4060-08ATG
20A
4.4pF
8
2.5V
MSOP-10
SP4065-08ATG
20A
4.4pF
8
3.3V
MSOP-10
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
65
Circuit Protection of Power-over-Ethernet (PoE)
Design Notes:
SEP0640Q38CB and TeleLink Fuse
Protection Application: Power over Ethernet (PoE) requires
additional protection for the power supply. PoE can be supplied
via Mode A (signal pair 2 & 3) or Mode B (signal pair 1 & 4).
Since the Powered Device (PD) must be capable of accepting
either Mode, a protection solution for both modes is the most
cost effective solution.
Solution Description: The SEP0640Q38CB is used in a very
unique manner for the PoE protection. Pins 2 & 7 must be
connected together via PCB layout for this implementation. In
this very specific case, the biasing pins are NOT used for
biasing purposes but rather for connections to the Power supply
leads being protected. The TeleLink is used to comply with UL
60950-1 safety requirements.
Regulatory Issues: Depending on where this Ethernet port is
located (Base Station Site, CP, CO, etc) the applicable
standards can range from IEEE 802.3 at/af, GR-1089, IEC
61000-4-2, 4-4, 4-5, ITU K.20 or K.21 and the Mainland China
Specifications YD/T 950, YD/T 1082, or YD/T 993EC 61000-4-2
will be the most appropriate standard that applies for this port.
From a safety perspective, UL/EN/IEC 60950-1 would apply.
Potential Solutions
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
66
Circuit Protection of Power-over-Ethernet (PoE)
Powered Device End (PD) and at the Power Supply End (PSE)
Design Notes:
Protection Application: Power over Ethernet (PoE) requires
additional protection for the power supply. PoE can be supplied
via Mode A (signal pair 2 & 3) or Mode B (signal pair 1 & 4).
Since the Powered Device (PD) must be capable of accepting
either Mode, a protection solution for both modes is the most
cost effective solution. This top solution shows a diode bridge
combined with the SMAJ58A as one solution choice.
Solution Description: The SMAJ58A is used in the typical
manner for power supply protection i. The TeleLink should be
added so the application complies with UL 60950-1 safety
requirements. Both the PD and PSE end should include
protection.
Regulatory Issues: Depending on where this Ethernet port is
located (Base Station Site, CP, CO, etc) the applicable
standards can range from IEEE 802.3 at/af, GR-1089, IEC
61000-4-2, 4-4, 4-5, ITU K.20 or K.21 and the Mainland China
Specifications YD/T 950, YD/T 1082, or YD/T 993EC 61000-4-2
will be the most appropriate standard that applies for this port.
From a safety perspective, UL/EN/IEC 60950-1 would apply.
Potential Solutions
SMAJ/SMBJ/SMCJ/SMDJ family
with standoff greater than PoE
voltage level that is typically 48V,
but could be higher.
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
67
Common Thyristor Applications
PROTECT
CONTROL
SENSE
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
68
Gas Igniters using Sidacs and High Energy Sidacs
Design Notes:
Sidac for Gas Igniter Circuit
Application: Sidac devices are used as switch on device
for Igniter Circuits. Operation Note: The resistor is
usually chosen to achieve spark
at interval of 100 – 250 mili second, or 4 to 10Hz.
Solution Description: For a voltage exceeding the Sidac
breakover voltage point, the Sidac switches on through a
negative resistance region to a low on-state voltage.
Conduction continues until the current is interrupted or
drops below the minimum holding current of the device.
K2400G is commonly used for Gas Grills, Stove Range
Top, and Fire Place Starter applications.
K2400GH
Companion Solutions: K2400GH is new Sidac for high
energy ignition systems where firing capacitor is 2 to 3µF
instead of 1.2µF
Multi-Spark Gap Outputs for Stove Range Top
Regulatory Issues: N/A
Unique Features: Circuit Initiated by push button switch.
Potential Solutions
Ordering Number
Mains
Input
K2400G
Application Warnings: N/A.
Firing Capacitance
Spark
Outputs
Output
Packaging
230 VAC
1.2µF
1
10KV
TO-92
K2400SHRP
230 VAC
2.2µF
4
10KV
SMT, DO-214
K2400GH
230 VAC
3µF
4
10KV
TO-92
PROTECT
CONTROL
SENSE
Road Map Products to Watch for: Unidirectional Sidac
Series Kxx00xHU
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
69
Tankless Water Heater Controller using Thyristors
Back to Back SCRs for High Amperage Circuit
Design Notes:
S8065J TO-218X SCRs
Application: Back to Back Power SCRs allow full wave
switching of 92Amps RMS at 50 to 60Hz.
DC
Temperature
Comparator
Circuit using
NTC sensor
Solution Description: Solid State Switching for long
term reliability. Use of Opto-coupler driver allows total
electrical isolation between DC temperature
comparator control circuit and AC high power circuit.
Zero Cross conduction gives burst control eliminating in
RFI from high AC switching. Each half cycle is turned
on and off at zero crossing. S8065J SCRs are for
highest wattage tankless Water Heater applications.
Pin 3 Not Used
Companion Solutions: 40Amp Alternistor Triacs could
be used for lower amperage applications instead of
Back to Back SCRs
Zero Crossing Opto-Coupler for Burst Control
Regulatory Issues: UL Recognized Packaged
Thyristors for Heat Sinking per UL1557
Potential Solutions
Ordering Number
Mains
Input
Possible Opto
Isolator
System Type
Output
Packaging
S8065J
230 VAC
MOC3083
Total Bathroom
Hot Water
Control
16KW
TO-218X
Q8040J7
230 VAC
MOC3083
Shower only
7.2KW
TO-218X
PROTECT
CONTROL
SENSE
Unique Features: TO-218X devices have robust eyelet
terminals for best soldered connections.
Application Warnings: N/A.
Confidential and Proprietary to Littelfuse. Littelfuse, Inc. © 2014
70