The TK4K1A60F from Toshiba is a MOSFET with Continous Drain Current 2 A, Drain Source Resistance 3380 to 4100 Milliohm, Drain Source Breakdown Voltage 600 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for TK4K1A60F can be seen below.