A Thermistor is a temperature sensing element comprised of a mix of metal and metal oxide semiconductor materials. Unlike other temperature-sensing devices that directly measure and display temperature, a thermistor works by changing its resistance in response to temperature variations. Thermistors usually have negative temperature coefficients in which the thermistor’s resistance decreases as the Thermistor’s temperature increases. Hence, they derive their name from their being ‘Thermal Resistors’.

Thermistors are a cost-effective alternative to sensors for measuring temperature and still work with a high degree of accuracy. They come in different shapes, such as disk, bead, rod, or chip, usually encapsulated in epoxy resin, paint, glass or phenolic and can be mounted or fixed into the system needing monitoring. These versatile components are used in a wide range of temperature sensing applications, such as Digital Thermometers, Refrigerators, Ovens, and Heating or Cooling circuits.

You can discover more in our thermistors guide.

Types of Thermistors

**NTC **Thermistors- Negative Temperature Coefficient Thermistors decrease resistance as temperature rises. An NTC is commonly used as a temperature sensor or in series with a circuit as an inrush current limiter.

PTC Thermistors- Positive Temperature Coefficient Thermistors increase resistance as temperature rises. PTC thermistors are commonly installed in series with a circuit and used as resettable fuses to protect against overcurrent conditions.

We offer a great selection of Thermistors from industry-leading brands, including EPCOS TE ConnectivityAmphenol Advanced Sensors and our own brand RS PRO

Browse the broad range of Thermistors RS has to offer and order today for next-day delivery.