The TK20A25D from Toshiba is a MOSFET with Continous Drain Current 20 A, Drain Source Resistance 73 to 100 Milliohm, Drain Source Breakdown Voltage 250 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.5 to 3.5 V. Tags: Through Hole. More details for TK20A25D can be seen below.