It is advisable to set the PTC thermistors to 5°C as the minimum operating temperature. A temperature of 80°C should not be exceeded during operation of this thermistor. These thermistors have 2 pins.
B59536A135A20 Features
Mount: Holder 2 Pins
B59536A135A20 Applications
There are a lot of EPCOS B59536A135A20 PTC Thermistors applications.