The PTC thermistors are put into SMD/SMT packages to protect the devices from damage. The PTC thermistor has 2 terminations. The PTC thermistors could supply 6V voltage when it operates. The heat produced by PTC thermistors should be 600mW. The maximum operating temperature for the thermistors should be 85°C. But the temperature should not be lower than -40°C when the thermistor operates.