The TK5A45DA from Toshiba is a MOSFET with Continous Drain Current 4.5 A, Drain Source Resistance 1520 to 1750 Milliohm, Drain Source Breakdown Voltage 450 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2.4 to 4.4 V. Tags: Through Hole. More details for TK5A45DA can be seen below.