These devices are made of a special ceramic material which changes resistance value rapidly with temperature change. They are commonly used to check thermal runaway with bipolar transistor amplifiers etc, but really have dozens of other uses. They are rugged and very reliable.Features:- Radial type, dipped epoxy- Type-NTC Ceramic material with tinned copper lead Specifications: Diameter 5mm Temperature Coefficient Negative (NTC) Resistance at 25°C ±10% 15 - 100kΩ Thermistor Temperature Range -20°C Thermal Dissipation Constant 6mW/°C Component Type Thermistor Pack Quantity 1pc Passive mount type Through Hole Passive connector type Solder Legs Pitch 5mm Component package Radial Maximum Power 500mW DC current rating 20mA