The TK7A55D from Toshiba is a MOSFET with Continous Drain Current 7 A, Drain Source Resistance 1000 to 1250 Milliohm, Drain Source Breakdown Voltage 550 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2.4 to 4.4 V. Tags: Through Hole. More details for TK7A55D can be seen below.