For protection, PTC thermistors are packaged in Radial packages. Packaged in the Bulk, these PTC thermistors are safe to handle. Using PTC thermistors at -40°C temperature should be their minimum operating temperature. There must not be an increase in temperature above 85°C for this thermistor to work. It has a total of 2 pins. PTC thermistors have been designed to operate at 1.39A volts.