NTC Thermistor

NTC thermistor are made from semicondecting materials that usually consists of a sintered ceramic fabricated temperature can be achieved. in a variety of shapes and sizes from a miture of oxides chosen from the elements Mn, Ni, Co, Cu and Fe.
By varying the composition and the size of the semiconducting elements, resistance values between 100 and 106ohms at room temperature can be achieved.

NTC thermistor has a negative temperature coefficient that resistance decreases with increasing temperature.

The name thermistor,derived from thermally-sensitive-resistor,was coined to describe a  form   of resistive device that possesses large temperature coefficient of resistance over an extended temperathre range.

Negative Temperature Coefficient thermistor