The TK19A50W from Toshiba is a MOSFET with Continous Drain Current 18.5 A, Drain Source Resistance 160 to 190 Milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2.7 to 3.7 V. Tags: Through Hole. More details for TK19A50W can be seen below.