The IRFU420A from Vishay is a MOSFET with Continous Drain Current 3.3 A, Drain Source Resistance 3000 milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4.5 V. Tags: Through Hole. More details for IRFU420A can be seen below.