The MF52A503H3950(A1) with an NTC thermistor is a 50 KOhm ± 3% 3950K through hole, 1/20W thermistor manufactured by Shiheng. It is rated at 1.7mm in diameter and is compliant with RoHS standards for hazardous materials. The thermistor is designed to detect and measure changes in its environment, such as changes in temperature, electrical bias, and mechanical pressure. It is commonly used in temperature measurement and control applications such as HVAC systems, refrigerators, and industrial automation systems.