The STE53NC50 from STMicroelectronics is a MOSFET with Continous Drain Current 53 A, Drain Source Resistance 70 to 80 Milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Chassis Mount. More details for STE53NC50 can be seen below.