Transcript Road Map

OVERCURRENT
PROTECTION
ROADMAP
P14 Committee
How did we get to where we are??
DEVICES
– Fuses
– PTC
How did we get to where we are??
TRADITIONAL FUSE CONSTRUCTION – Wire in Air
Ferrule
1-1/4 X 1/4 " or 3AG
Solder
&
Flux Residue
Fusible
Element
5 x 20 mm
Glass or
Ceramic Tube
How did we get to where we are??
Axial leaded of existing product
¼ x 1-1/4 inch
5 x 20 mm
Miniaturization
New smaller dimension axial lead
Surface Mount
How did we get to where we are??
TYPES OF FUSES
–
–
–
–
Elements
Thin Film
Thick Film
Multilayer
How did we get to where we are??
PTC
– Ceramic
•
Since the 1960’s
– Polymer
•
Since the 1980’s
– Circuits can be built to cut-off
current
Overcurrent Protection Roadmap
STATUS
• Physical Size Range
– 0402
– 13/32 “
• Voltage Range
– 24 V
– 600 V
• Current Range
– 2 mA
– 60 A
Overcurrent Protection Roadmap
ISSUES
•
•
•
•
Alarm indication
Arcing
Venting
Environmental
– Lead-free and other substance bans
– Higher process temperatures
Overcurrent Protection Roadmap
TRENDS/EVOLUTION
•
•
•
•
Smaller
Less expensive
Higher Energy Density
Higher Precision
– 100 +/- 5%
• Higher Voltage Ratings
• Lower Voltage Ratings
• New Ceramics
IPD Roadmap
Space savings
CSP 32 Ball/1mm pitch: 71.3% less area than 0805
QSOP 16 pin Isolated: 60% less area than 0805
0603 Chip resistors: 53% less area than 0805
0805 Chip resistors