The STE145N65M5 from STMicroelectronics is a MOSFET with Continous Drain Current 143 A, Drain Source Resistance 12 to 15 Milliohm, Drain Source Breakdown Voltage 650 V, Gate Source Voltage - 25 to 25 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Chassis Mount. More details for STE145N65M5 can be seen below.