The TK40J20D from Toshiba is a MOSFET with Continous Drain Current 40 A, Drain Source Resistance 37.4 to 44 Milliohm, Drain Source Breakdown Voltage 200 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.5 to 3.5 V. Tags: Through Hole. More details for TK40J20D can be seen below.