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R01E.pdf
06.1.25
What is a Thermistor?
Thermally
Sensitive Resistor
Characteristics of Thermistors
Resistance - Temperature Characteristics
Log
R
2xR25
R25
Thermistor
Positive
Temperature
Coefficient
PTC Thermistor
(POSISTOR
r
)
BaTiO
3
+ X
Ceramics
Log
R
R25
25
PTC
Negative
Temperature
Coefficient
Curie
Point
T
NTC Thermistor
Mn-Ni, Mn-Co-Cu,
Mn-Ni + X
Ceramics
NTC
25
T
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.
1. 0402 and 0603 light weight
+Vcc
R1
PRF
Thermal
Contact
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.
Example
Fan Motor
Power IC
Thermal
Contact
Comparator
Control IC
R
L
M
R2
R
E
GND
PRF
Vref
PRF15 Series Characteristics
New
Part Number
PRF15BA471QB1RC
PRF15BB471QB1RC
PRF15BC471QB1RC
Characteristics
BA
BB
BC
470ohm
±50%
Resistance
(at +25°C)
Sensing Temp.
(at 4.7k ohm)
125±5°C
115±5°C
105±5°C
Maximum
Voltage
Operating Temp.
-20 to +140°C
32VDC
-20 to +130°C
-20 to +120°C
Dimensions
0.5±0.05
0.1-0.4
1.0±0.05
0.5±0.05
(in mm)
Electrode
Construction
Cross-sectional
PTC
Ceramic
Sn Plating
Nickel Barrier
MURATA [ MURATA MANUFACTURING CO., LTD. ]
