The TK18A30D from Toshiba is a MOSFET with Continous Drain Current 18 A, Drain Source Resistance 100 to 139 Milliohm, Drain Source Breakdown Voltage 300 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.5 to 3.5 V. Tags: Through Hole. More details for TK18A30D can be seen below.