The SiHF12N50C-E3 from Vishay is a MOSFET with Continous Drain Current 12 A, Drain Source Resistance 460 to 555 milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Surface Mount. More details for SiHF12N50C-E3 can be seen below.