For NTC thermistor, when temperature rises, the resistance decreases exponentially. Mix, mold and sinter two or more metal oxides, manganese, copper, silicon, cobalt, iron, nickel and zinc to produce NTC thermistor. The resistivity and material constants vary with the composition ratio, the sintering temperature, the sintering temperature and the structural state. Now, there are some non-oxide NTC thermistor, such as silicon carbide, stannic selenide, and tantalum nitride.
NTC thermal semi conductive ceramic has mainly spinel structure or oxide ceramic of other structure, which has negative temperature coefficient. The ceramic crystal changes its resistance with the temperature change. This is decided by the property of semiconductor.
The measuring range of NTC thermistor is -10～+300°C, -200～+10°C, or even +300～+1200°C for some special type NTC thermistor. The accuracy of NTC thermistor can be 0.1°C and the temperature sensing time can be up to 10s or less. It can be used as thermometric indicator in the granary, or temperature sensor in food storage, medical science, scientific farming, ocean, deep well, upper air, and glacier, etc.
Physical photo of NTC thermistor
There is a low cost high performance NTC thermistor in ATI, ATH10KR8B. Moreover, various types NTC thermistors are provided in ATI website, check for more information.
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