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R01E.pdf
06.1.25
What is a Thermistor?
Thermally Sensitive Resistor
Characteristics of Thermistors
Resistance - Temperature Characteristics
Log
R
PTC Thermistor
Thermistor
Positive Temperature Coefficient
(POSISTORr)
2xR25
R25
BaTiO 3 + X
Ceramics
Log
Curie
Point
T
25
R
PTC
R25
NTC Thermistor
Negative Temperature Coefficient
Mn-Ni, Mn-Co-Cu,
Mn-Ni + X
T
25
Ceramics
NTC
PRF15/ 18 Series Chip POSISTORr for Overheat Sensing
PRF15/18 PTC Chip thermistors detect overheating of
Hybrid ICs, Power Transistors, Power Diodes and
Power ICs etc.
2. High gain simplifies circuit design
3. Free of contact noise and problems
4. Pb free plated terminations.
5. Sturdy construction resists mechanical vibration
and shock.
1. 0402 and 0603 light weight
Example
+Vcc
Fan Motor
Power IC
Thermal
R1
Thermal
Contact
RL
M
Contact
Comparator
PRF
Control IC
PRF
R2
RE
Vref
GND
PRF15 Series Characteristics
Sensing Temp.
(at 4.7k ohm)
Maximum
Voltage
Resistance
(at +25°C)
Part Number
Characteristics
Operating Temp.
PRF15BA471QB1RC
PRF15BB471QB1RC
PRF15BC471QB1RC
BA
BB
BC
125±5°C
115±5°C
105±5°C
-20 to +140°C
-20 to +130°C
-20 to +120°C
470ohm ±50%
32VDC
Dimensions
Electrode
Construction
Cross-sectional
PTC
Ceramic
0.5±0.05
0.1-0.4
0.5±0.05
1.0±0.05
(in mm)
Nickel Barrier
Sn Plating
MURATA [ muRata ]
