The TK50J30D from Toshiba is a MOSFET with Continous Drain Current 50 A, Drain Source Resistance 40 to 52 milliohm, Drain Source Breakdown Voltage 300 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.5 to 3.5 V. Tags: Through Hole. More details for TK50J30D can be seen below.