The STB45N50DM2AG from STMicroelectronics is a MOSFET with Continous Drain Current 35 A, Drain Source Resistance 70 to 84 Milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage - 25 to 25 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Surface Mount. More details for STB45N50DM2AG can be seen below.