In order to protect the PTC thermistors from damage, they are packaged in SMD/SMT packages. There are 2 terminations on the PTC thermistor. It is possible for PTC thermistors to provide voltages of 6V when they are operating. It is expected that PTC thermistors produce 400mW heat. For thermistors, 85°C is the maximum operating temperature. But when the thermistor is operating, the temperature cannot be below -40°C.