Introduction to NTC.Microwave Radar Sensor Processor

　　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. (NTC) thermistor. Its 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.

　　NTC thermal semiconducting ceramics are mostly oxide ceramics with spinel structure or other structures, with negative temperature coefficient, and the resistance value can be approximately expressed as: Rt = RT0*EXP(Bn*(1/T-1/T0) )

　　where RT and RT0 are the resistance values at temperatures T and T0, respectively, and Bn is the material constant. The resistivity of the ceramic grain itself changes due to temperature changes, which is determined by the characteristics of the semiconductor.

Read recommendations:

Introduction to the Performance of NTC Temperature Sensors.Ultrasonic module

Three important roles of negative temperature coefficient thermistor NTC.SMD PIR IC manufacture

PIR Lens 8310

HW-M09-2 microwave sensor module

HW-F1000-1 Fresnel Solar Lens