Thermistors

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What Are Thermistors?

Thermistors are temperature-sensitive resistors that change resistance with temperature variations, offering precise measurement and control in many applications.

NTC Thermistors

NTC thermistors decrease in resistance as temperature rises, making them ideal for applications requiring accurate temperature monitoring and control.

PTC Thermistors

PTC thermistors increase resistance as temperature rises, commonly used for circuit protection, heaters, and overcurrent limiting devices.

Temperature Thermistors

Temperature thermistors are widely used in electronics, medical devices, and HVAC systems to provide reliable and cost-effective thermal management solutions.

Thermocouples and Thermistors

Thermocouples and thermistors are both temperature sensors, but thermistors are preferred when higher accuracy and sensitivity are needed for precise measurements.

Frequently Asked Questions

A thermistor is a temperature-sensitive resistor used for measurement and control signals, while a thermostat is a switching device that turns systems on or off at set temperatures. Thermistors provide data; thermostats act on thresholds.

The two main types are NTC thermistors, which decrease resistance as temperature rises, and PTC thermistors, which increase resistance with rising temperature. Each type is used for different sensing and protection applications.

You can identify the type by measuring resistance while gently heating the thermistor. If resistance drops, it’s an NTC thermistor; if resistance rises, it’s a PTC thermistor.

Yes, thermistors can be used in AC circuits, most commonly for inrush current limiting, temperature monitoring, and circuit protection. PTC thermistors are especially common in AC protection applications.

Thermistors are preferred for high accuracy in narrow temperature ranges, while thermocouples are better suited for very high temperatures and harsh environments. The choice depends on temperature range and precision requirements.

The four most common temperature sensor types are thermistors, thermocouples, RTDs, and semiconductor (IC) temperature sensors. Each differs in accuracy, range, response time, and cost.