The TK12P50W from Toshiba is a MOSFET with Continous Drain Current 11.5 A, Drain Source Resistance 265 to 340 milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2.7 to 3.7 V. Tags: Surface Mount. More details for TK12P50W can be seen below.