It is common to find NTC thermistors packaged in the form of a Bulk. In order to make it more convenient, it has been included in the package Nonstandard. NTC thermistors are designed to operate reliably at temperatures below 100°C. In order to preserve reliability, NTC thermistors should not be operated at temperatures below -40°C. The NTC thermistors must have the 2 pins connected for them to work properly.