The TCTR0402F100KF4050T is a NTC Thermistors 0402 RoHS manufactured by ResistorToday. It is a 0402-sized thermistor with a resistance of 100K ohms. It has an operating temperature range of -55°C to +150°C and a tolerance of 50%. It is RoHS compliant, meaning that it does not contain mercury, lead, or other hazardous material, and is compliant with RoHS environmental regulations. It is designed for use in Arduino projects, lights, appliances, power supplies, and other electronic components.