Thermistors include positive temperature coefficient (PTC) and negative temperature coefficient (NTC) thermistors.
The main characteristics of thermistor are as follows:
① high sensitivity, and its temperature coefficient of resistance is 10-100 times larger than that of metal;
② The working temperature range is wide, the normal temperature device is suitable for - 55 ℃ ~ 315 ℃, the high temperature device is suitable for the temperature higher than 315 ℃ (currently the maximum can reach 2000 ℃), and the low temperature device is suitable for - 273 ℃ ~ 55 ℃;
③ It is small in size and can measure the temperature of voids, cavities and blood vessels in the organism which can not be measured by other thermometers;
④ It is easy to use, and the resistance value can be in the range of 0.1 ~ 100k Ω Any choice between them;
⑤ It is easy to process into complex shape and can be mass produced; ⑥ Good stability, strong overload capacity
Because of its unique performance, semiconductor thermistor can not only be used as measuring element (such as measuring temperature, flow, liquid level, etc.), but also as control element (such as thermal switch, current limiter) and circuit compensation element. Thermistors are widely used in household appliances, electric power industry, communication, military science, aerospace and other fields, and have a broad development prospect.
ntc thermistor