To prevent damage to the PTC thermistors, they are packaged in 0603 packages. PTC thermistors are packaged in the Tape and Reel as a safety measure. Temperature -40°C is the minimum operating temperature for PTC thermistors. This thermistor must not operate above 125°C in order for it to work. A thermistor has 2 pins. In the PTC thermistors, 22mA is the current they are designed to handle.