The STE48NM50 from STMicroelectronics is a MOSFET with Continous Drain Current 48 A, Drain Source Resistance 80 to 100 Milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Chassis Mount. More details for STE48NM50 can be seen below.