Thermistors

What is a Thermistor?

A Thermistor is a temperature sensing element comprised of a mix of metal and metal oxide semiconductor materials. Thermistors normally have negative temperature coefficients in which the thermistor’s resistance decreases as the Thermistor’s temperature increases. Hence they derive their name due to 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, glassed or phenolic and can be mounted or fixed into the system needing monitoring.

How does a Thermistor work?

A thermistor does not measure and display temperature conventionally like other temperature sensing devices, instead the resistance of a thermistor changes with temperature.

The amount of change in resistance is dependent on the detecting material used in the thermistor and the media being measured. Requiring the measurement of a solid, liquid, or gas usually dictates what the optimal material for the job is.

A temperature controller is used to monitor the temperature of the Thermistor and sends a signal to a heater or cooler to regulate the temperature of the sensor.

While the main use of Thermistors are as resistive temperature sensors, they can also be connected in series with another component or device to control an electrical current flowing through them.

Type of Thermistors

NTC (Negative Temperature Coefficient) Thermistors – NTC 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 (Positive Temperature Coefficient) Thermistors – PTC 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.

Applications of Thermistors

Due to the versatility and effectiveness of Thermistors, they are used in many temperature sensing applications such as:

  • Digital Thermometers
  • Cars to measure oil and coolant
  • Ovens
  • Refrigerators
  • Heating or Cooling protection circuits

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


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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
RS Stock No. 433-3720
Mfr. Part No.SONDE NTC PVC 3M
BrandEliwell
kr 250,80
Each
Units
NTC -30°C +80°C 2 m/s 6mm 40mm 3m 1 % - AISI 304 -
RS Stock No. 433-3685
Mfr. Part No.SONDE PTC SILICONE 3M
BrandEliwell
kr 394,83
Each
Units
PTC -50°C +120°C 2 m/s 6mm 40mm 3m 1 % - AISI 304 -
RS Stock No. 686-2113
Mfr. Part No.B59100M1120A070
BrandEPCOS
kr 54,35
Each
Units
PTC - +120°C - 3mm 10mm 500mm - - - 100Ω
RS Stock No. 370-6133
Mfr. Part No.D00583/PS8/50/2000/LM35DZ/S/M
BrandCorrege
kr 448,99
Each
Units
NTC -20°C +100°C - 8mm 50mm 2m - - Ceramic -
RS Stock No. 456-7995
Mfr. Part No.0628 7516
BrandTesto
kr 703,50
Each
Units
NTC -50°C +80°C 150 s - 40mm - - - - -
RS Stock No. 480-5118
Mfr. Part No.K1P-N-2LS-70
kr 322,99
Each
Units
PTC -50°C +70°C - 4.5mm 60mm - - - - -
RS Stock No. 437-8852
Mfr. Part No.H0234L
BrandDigitron
kr 526,22
Each
Units
- - +120°C - 3.3mm 100mm - - - - -
RS Stock No. 163-384
Mfr. Part No.PTC0150000
BrandCarel
kr 205,03
Each
Units
PTC 0°C +150°C 15 s 6mm 40mm 1.5m - Cable Gland Stainless Steel 1kΩ
RS Stock No. 686-2104
Mfr. Part No.B59100M1080A070
BrandEPCOS
kr 52,77
Each
Units
PTC - +80°C - 3mm 10mm - - - - 100Ω
New
RS Stock No. 246-9687
Mfr. Part No.B57891S0103F008
BrandEPCOS
kr 23,20
Each
Units
- - - - - - - - - - -
New
RS Stock No. 246-9688
Mfr. Part No.B57891S0203J008
BrandEPCOS
kr 5,56
Each (In a Box of 1000)
Units
- - - - - - - - - - -
RS Stock No. 210-4376
Mfr. Part No.RL1005-5744-103-SA
kr 35,658
Each (In a Pack of 5)
Units
NTC -50°C 150°C 10 s - - - - - - 10kΩ
RS Stock No. 210-4324
Mfr. Part No.CL-60
kr 11,498
Each (In a Bag of 2000)
Units
NTC -50°C 175°C 100 s - - - - - Ceramic 10Ω
RS Stock No. 188-3711
Mfr. Part No.HI765PW
kr 933,01
Each
Units
PTC -50°C +150°C 8 s - 1m - - - - -
New
RS Stock No. 246-9730
Mfr. Part No.B59840C0160A070
BrandEPCOS
kr 19,05
Each
Units
- - - - - - - - - - -
New
RS Stock No. 246-9689
Mfr. Part No.B57891S0203J008
BrandEPCOS
kr 10,355
Each (In a Pack of 10)
Units
- - - - - - - - - - -
New
RS Stock No. 246-9734
Mfr. Part No.B59880C0130A070
BrandEPCOS
kr 5,158
Each (In a Box of 500)
Units
- - - - - - - - - - -
New
RS Stock No. 246-9716
Mfr. Part No.B59750B0120A070
BrandEPCOS
kr 18,118
Each (In a Box of 500)
Units
- - - - - - - - - - -
New
RS Stock No. 246-9676
Mfr. Part No.B57500M0103A005
BrandEPCOS
kr 52,49
Each
Units
- - - - - - - - - - -
New
RS Stock No. 246-9665
Mfr. Part No.B57343V5103F360
BrandEPCOS
kr 1,811
Each (On a Reel of 4000)
Units
- - - - - - - - - - -