What is NTC thermistor?

Definition

Negative temperature coefficient thermistor, also known as NTC thermistor, is a kind of resistor whose resistance value decreases with the increasing of temperature, which is Widely used in various electronic components, such as temperature sensors, resettable fuses and self-adjusting heaters.

Mechanism

NTC is the abbreviation of Negative Temperature Coefficient, which means negative temperature coefficient. It generally refers to semiconductor materials or components with a large negative temperature coefficient. The so-called NTC thermistor is a negative temperature coefficient thermistor. It is mainly made of metal oxides such as manganese, cobalt, nickel and copper, and is made by ceramic technology. These metal oxide materials all have semiconducting properties because they are completely similar to semiconductor materials such as germanium and silicon in electrical conductivity. When the temperature is low, the number of carriers (electrons and holes) of these oxide materials is small, so its resistance value is higher; as the temperature increases, the number of carriers increases, so the resistance value decreases. The variation range of NTC thermistor at room temperature is 100~1000000 ohms, and the temperature coefficient is -2%~-6.5%. NTC thermistors can be widely used in temperature measurement, temperature control, temperature compensation, and so on.

The Composition of NTC Thermistor

NTC (Negative Temperature Coefficient) refers to the thermistor phenomenon and material whose resistance decreases exponentially with increasing temperature and has a negative temperature coefficient. The material is a semiconductor ceramic made of two or more metal oxides, such as manganese, copper, silicon, cobalt, iron, nickel, zinc, etc., which are fully mixed, formed, and sintered. It can be made into a negative temperature coefficient thermistor. The resistivity and material constant vary with the proportion of material composition, sintering atmosphere, sintering temperature and structural state. Now there are also non-oxide NTC thermistor materials represented by silicon carbide, tin selenide, tantalum nitride, etc.

The Operating Temperature Range of NTC Thermistor

Its measurement range is generally -10 ~ +300 ℃, can also be -200 ~ +10 ℃, and can even be used for temperature measurement in +300 ~ +1200 ℃ environment. The accuracy of the negative temperature coefficient thermistor thermometer can reach 0.1 ℃, and the temperature sensing time can be as short as 10s or less. It is not only suitable for granary thermometers, but also for temperature measurement in food storage, medicine and hygiene, scientific farming, oceans, deep wells, high altitudes, glaciers, etc.

Application:

Application of NTC thermistor in red wine cork reading temperature, smart toilet, and coolant temperature sensor;

Electronic thermometer, electronic perpetual calendar, electronic clock temperature display, electronic gifts;

Heating and cooling equipment, heating thermostatic appliances;

Automotive electronic temperature measurement and control circuit;

temperature sensor, temperature instrument;

Medical electronic equipment, electronic toilet equipment;

Cell phone batteries and chargers.

Tag: NTC temperature sensor; NTC thermistor; Negative temperature coefficient; Jingpu Sensor; JP sensor

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