negative temperature coefficient (electronics) (NTC)
Negative Temperature Coefficient (NTC) are thermistors with a negative temperature coefficient. When cold, they have a relatively high resistance, which decreases nonlinearly when heated by current flow. At high temperatures, the resistance value is very low.
NTC thermistors are semiconductor devices, they are mainly made of silicon( Si), germanium( Ge) and gallium arsenide( GaAs). They are highly sensitive devices that respond to minute temperature variations, have short response times, and are installed as thermal protection to limit inrush currents in motors, power supplies, and other electrical and electronic circuits.
Resistance values for NTC thermistors range from 1 ohm to 1 mega-ohm, they are designed for temperatures between -50 °C and +300 °C and have temperature coefficients of up to 5 %/°C.