Cantherm distributes nine series of NTC thermistors and one type of PTC thermistor. The company's TS3 series of NTC thermistor is used as an overtemperature protector for power semi-conductors, such as transistors, power output stages, and amplifiers. The thermistors features a negative temperature coefficient ranging from 40 percent per C to 200 per C. Below the transition region the thermistor exhibits a linear thermistor characteristic of -2 to -4 C.