Important Information about NTC Thermistors

Thermistors are temperature sensing devices that are constructed with semiconductor materials.They are sintered to display significant changes in resistance that is directly proportional to small changes in ambient temperature. Targeted direct currents (DC) are used to measure resistance by passing through thermistors to measure any voltage drops produced.

NTC thermistor


The three most common thermistor applications are:

  1. Temperature Control
  2. Temperature Measurement
  3. Temperature Compensation

Thermistors are built with sintered ceramics that consist of sensitive materials that have a consistently reproducible property of temperature vs. resistance. The devices are non-linear resistors that can alter their resistance characteristics when the temperature changes. The resistance of an NTC thermistor will always decrease as temperature increases. Resistance decreasing is dependent on the constant Beta (ß), which is measured in °K.

It is not difficult to calculate the resistance of NTC devices when using beta to understand temperature. There are, however, easier ways to go about doing these calculations. One of the most frequently used methods of calculating resistance is the Steinhart & Hart Equation.

NTC thermistors are frequently used in applications where semiconductor circuity is being used. Thermistors work better for solving problems that are related to temperature. These devices can be used to calculate the temperature coefficient quickly. We will help provide the basic guidelines for using these thermistors to achieve accurate measurements.

NTC Thermistors are growing in popularity. The demand is increasing for these temperature sensors, and this is especially the case for the automotive industry. Car manufacturers use thermistors for a vehicle’s powertrain and other safety controls. Many modern cars have upwards of 30 thermistors including, NTC and PTC thermistors.



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