Thermistor is a kind of sensitive elements, which can be divided in two types, PTC thermistor and
NTC thermistor, according to different temperature coefficients. The typical characteristics of thermistor are that at different temperatures, it can show different resistance values. With increase of temperature, the resistance of PTC can increase and the resistance of NTC can decline. PTC and NTC both belong to semiconductor devices.
PTC came out in 1950 and then in 1954, PTC started to use barium titanate as the main materials. In industry, PTC thermistor can be used for temperature measurement and control, temperature detection and regulation. What’s more, PTC thermistor can play a role of a switch, which is called thermal switch.
NTC thermistor has a long history. In 1834, scientists first discovered silver sulfide has the characteristics of the negative temperature coefficient. In 1930, scientists found that cuprous oxide-copper oxide also h as performances of negative temperature coefficients, which has been widely used in temperature compensating circuit of aviation instruments.Then, with the continuous development of transistor technology, significant progress has been obtained on the research of thermistor. NTC thermistor was developed in 1960, which has been used for measuring temperature, controlling temperature, temperature compensation and so on.
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