PTC thermistors are packaged as SMD/SMT units to prevent damage. PTC thermistors are terminated at 2. As a result, PTC thermistors may supply 13.2V voltage at all times. Thermal resistance should be 400mW when PTC thermistors are used. For thermistors, 85°C should be the maximum operating temperature. But the temperature should not fall below -40°C when the thermistor operates.