Working principle of NTC negative temperature coefficient thermistor

　　NTC is the abbreviation of Negative Temperature Coefficient, which means negative temperature coefficient. It generally refers to semiconductor materials or components with large negative temperature coefficient. The so-called NTC thermistor is a negative temperature coefficient thermistor. It is made of manganese, cobalt, nickel, copper and other metal oxides by ceramic technology. These metal oxide materials have semiconductor properties, because they are completely similar to germanium, silicon and other semiconductor materials in the conductive way. When the temperature is low, the number of carriers (electrons and holes) of these oxide materials is small, so their resistance values are high; With the increase of temperature, the number of carriers increases, so the resistance value decreases. The variation range of NTC thermistor at room temperature is 10O~1000000 ohms, and the temperature coefficient is - 2%~- 6.5%. NTC thermistors can be widely used in temperature measurement, temperature compensation, surge current suppression and other occasions.

　　NTC Negative Temperature Coefficient Thermistors

　　Zero power resistance value RT (Ω)

　　RT refers to the resistance value measured at the specified temperature T with the measurement power that causes the resistance value change to be negligible relative to the total measurement error.

　　The relationship between resistance value and temperature change is:

　　RT = RN expB(1/T – 1/TN)

　　RT: resistance value of NTC thermistor at temperature T (K).

　　RN: NTC thermistor resistance value at rated temperature TN (K).

　　T: Specified temperature (K).

　　B: The material constant of NTC thermistor is also called thermal sensitivity index.

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