The TK040N65Z from Toshiba is a MOSFET with Continous Drain Current 57 A, Drain Source Resistance 33 to 40 milliohm, Drain Source Breakdown Voltage 650 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 4 V. Tags: Through Hole. More details for TK040N65Z can be seen below.