Thermistors

made by Fenghua

Fenghua NTC thermistors

Thermally sensitive resistors

Electrical resistors whose value changes with temperature are called thermally sensitive resistors. Depending on the temperature behavior, electronics experts distinguish between

  • NTC thermistors: negative temperature coefficient (NTC); higher conductivity at high temperatures
  • PTC thermistors : positive temperature coefficient (PTC); higher conductivity at low temperatures

Thermistors are used, among other things, for devices for electrical temperature measurement, but also for limiting the starting current of electrical devices.

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How does a thermistor work?

Thermistors are semiconductor sensors that change their electrical resistance value with temperature. A linear course of the resistance measurement with the temperature takes place with these sensors only in a limited temperature range. For this reason, low resistance thermistors are used for low temperature applications. High temperature ranges require a thermistor specification with correspondingly high resistance. The stability of the measurement also depends on the type of coating. Glass sealed thermistors are more stable than epoxy coated NTCs.

Thermistor vs Thermometer

The question of whether a thermistor or a temperature sensor (thermocouple) leads to optimum temperature measurement or temperature control is determined by the following requirements:

  • Temperature range
  • Stability
  • Measurement accuracy
  • Sensitivity
  • Packing/assembly.