The WMF21-5D11MPUP8CB5 with NTC Thermistors Through Hole RoHS is a thermistor manufactured by Tyohm. It is a temperature-sensing device that can detect changes in temperature and convert it into an electrical signal. It is constructed of an NTC-type thermistor, which stands for Negative Temperature Coefficient. This type of thermistor becomes less resistive as it gets hotter, allowing the temperature to be detected. It has an operating temperature range of -55°C to +110°C. The thermistor comes in a through-hole construction and is RoHS compliant.