Thermistors are temperature-sensing elements made of semiconductor material that has been sintered in order to display large changes in resistance in proportion to small changes in temperature.

**Typical Applications Include:**

- Temperature Compensation
- Voltage Regulation
- Circuit Protection
- Volume Control
- Time Delay

## Thermistor Application Notes Summaries

- What is an NTC Thermistor

Summary: Explains what an NTC thermistor is and its capabilities as a temperature sensor. Ametherm’s NTC thermistors and probes are described, as well as the terminology used. - How to Select an NTC Thermistor

Summary: Provides the key factors to consider when**choosing a thermistor**, gives an overview of the types of NTC thermistors Ametherm produces, and touches on calculations often needed when deciding which part to implement. - NTC Thermistors – Temperature Measurement With Wheatstone Bridge

Summary:**The Wheatstone Bridge**is one of the easiest ways to measure temperature and explains how it is calculated using a specific example with certain variables. A chart of temperature versus volts is also provided. - Reliability Of A Thermistor
- Summary: Products that contain thermistors usually carry a warranty. Find out how to determine the reliability of a thermistor in that product by doing a calculation. The equation – mean time before failure or
**MTBF of a thermistor**– is demonstrated. - NTC Thermistors – Accurate Measurements for NTC Thermistors

Summary: In using**NTC thermistors to obtain accurate measurements**, a phenomenon called “immersion stem effect” can occur. This article defines it and how it can be eliminated. - NTC Thermistors – Calculate Beta Value For NTC Thermistors

Summary: Explains why the beta value, although often used, is not as accurate as using the Steinhart and Hart equation. The**Steinhart and Hart equation**uses three temperatures over a given range. - NTC Thermistors – Power Dissipation for Temperature Detection Circuits

Summary: Calculating power dissipation can lead to errors, causing an inaccurate correlation between voltage reading and temperature. One solution is to use a bridge diagram which has a linear voltage-temperature characteristic, as opposed to using the temperature-rsistance curve which is non-linear and much harder to use. - NTC Thermistors – Steinhart and Hart Equation

Summary: This equation is arguably the best to use when determining the**resistance temperature relationship of NTC thermistors**and NTC probe assemblies, given that the equation uses three temperatures. This article tells you which equation to use in your particular application. - NTC Thermistor – Calculating the Temperature Coefficient of a Thermistor

Summary: This article provides you with an equation you can use to**calculate a thermistor’s temperature coefficient**. The temperature coefficient is the change that occurs in the resistance with a change in temperature. A useful and frequent customer example is provided. - NTC Thermistors – Temperature Compensation Circuits

Summary: Metals like coils and solenoids often present problems involving temperature compensation. In an automotive application, you can minimize this problem by using a total resistance equation and a linearization equation. A step-by-step calculation will guide you.