There is a certain confusion with the definition of what a thermistor is. This is due to the fact that the posistor is often confused with it, calling the latter a “PTC thermistor”. In fact, these are different things, and they serve different purposes, so it is worth learning to distinguish between these elements.


  • 1 What is a thermistor
  • 2 What is it needed for
  • 3 What can replace

What is a thermistor

A thermistor is a thermistor that has a negative temperature coefficient of resistance (TKS). In other words, unlike posistors, with increasing temperature, the resistance of such an element does not increase, but on the contrary, decreases.

Poistor and thermistor

External difference between thermistor and posistor

These semiconductor temperature resistance components are made of special materials that have much higher TKS characteristics than pure metals and alloys. As a rule, powder metallurgy technologies using certain metal oxides and complex combinations of components with high resistive properties.

What is it needed for

Power supply inside

Thermistors are used in power supplies to protect against overheating.

Such resistors are mainly used to effectively limit the starting current at varying temperature conditions. Especially it concerns devices and devices in which exact control of temperature condition is of fundamental importance. These elements serve as a means of protection against overheating and overloads of electrical and electronic equipment and help prevent its failure. Thermistors are widely used in the following areas and areas:

  • electrical engineering;
  • production of electronic and computer equipment;
  • high precision instrument making.

This type of electrical equipment can be easily found, for example, on any computer motherboard or in an electronic filling of a household household appliance.

What can replace


Approximate thermistor dimensions

Despite the fact that the structural element looks quite simple, replace it with any other component of electrical equipment is very problematic. The fact is that the main feature of this resistor is its ability to change the characteristics of the resistance with changes in operating temperature. In addition, materials used as a resistive filler thermistor are of great importance.

Thermistors are widely used in electrical engineering and electronics. At its core, it is an indispensable element, since it is distinguished by its behavior with temperature changes — as it rises, the resistance of the element drops.