Thermistors are a type of resistor that acts as a temperature-sensing element, generally made of ceramic or polymer. Thermistors exhibit a large change in resistance proportional to a small change in temperature.
Thermistors come in two common types:
NTC (Negative Temperature Coefficient) thermistors – In these thermistors resistance decreases as temperature rises. An NTC is commonly used as a temperature sensor, or in series with a circuit as an inrush current limiter.
PTC (Positive Temperature Coefficient) thermistors – In these thermistors resistance increases as temperature rises. PTC thermistors are commonly installed in series with a circuit, and used to protect against overcurrent conditions, as resettable fuses.

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Description Price Thermistor Type Minimum Temperature Sensed Maximum Temperature Sensed Response Time Probe Diameter Probe Length Cable Length Accuracy Termination Type Material Resistance Termination
RS Stock No. 456-9058
Mfr. Part No.0610 1725
NTC -35°C +80°C 5 s 3mm 40mm - - - - - Unterminated
RS Stock No. 456-7995
Mfr. Part No.0628 7516
NTC -50°C +80°C 150 s - 40mm - - - - - Unterminated