The STP12N65M5 from STMicroelectronics is a MOSFET with Continous Drain Current 8.5 A, Drain Source Resistance 390 to 430 Milliohm, Drain Source Breakdown Voltage 650 V, Gate Source Voltage 25 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Through Hole. More details for STP12N65M5 can be seen below.