The TK17A80W from Toshiba is a MOSFET with Continous Drain Current 17 A, Drain Source Resistance 280 to 290 Milliohm, Drain Source Breakdown Voltage 800 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 3 to 4 V. Tags: Through Hole. More details for TK17A80W can be seen below.