The STF12N50M2 from STMicroelectronics is a MOSFET with Continous Drain Current 10 A, Drain Source Resistance 325 to 380 Milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage - 25 to 25 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for STF12N50M2 can be seen below.