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Vishay BCcomponents
Document Number: 29086 For technical questions contact: nlr.europe@vishay.com www.vishay.com
Revision: 03-Aug-04 1
145 V PTC Thermistors For
Overload Protection
FEATURES
•
Wide range of trip and non-trip currents: from 47 mA up to
1 A for the trip current
•
Wide range of resistance: from 1.3
Ω
up to 240
Ω
•
Small ratio between trip and non-trip currents
(I
t
/I
nt
= 1.5 at 25 °C)
•
High maximum inrush current
•
Excellent long term behaviour, also in humidity
•
Leaded parts withstand mechanical stresses and vibration
•
UL file E148885 according to XGPU standard UL1434
•
UL approved PTCs are guaranteed to withstande severe
test programmes
• Long-life cycle tests (over 5000 trip cycles)
• Long-life storage tests (3000 hours at 250°C
• Electrical cycle tests at low ambient temperatures
(- 40°C or 0°C)
• Damp-heat and water immersion tests
• Overvoltage tests at up to 200% of rated voltage
APPLICATIONS
•
Telecommunications
•
Automotive systems
•
Industrial electronics
•
Consumer electronics
•
Electronic data processing.
DESCRIPTION
These directly heated thermistors have a positive
temperature coefficient and are primarily intended for
overload protection. They consist of a naked disc with two
tinned brass or copper clad steel leads and coated. Leadless
disks and leaded disks without coating are available on
request.
MOUNTING
The PTC Thermistors are suitable for processing on
automatic insertion equipment.
Soldering
< 240 °C; duration < 5 s.
Resistamnce to heat
< 260 °C; duration < 5 s.
MARKING
Only the grey lacquered thermistors with a diameter of 8.5 to
20.5 mm are marked with BC, R25 value (example 1R9) on
one side and Int, V
max
on the other side.
QUICK REFERENCE DATA
PARAMETER VALUE UNIT
Switch temperature 140 °C
Maximum voltage (RMS) 145 V
Temperature range 0 to 70 °C
Climatic category 25/125/56