The IRFR420A 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: Surface Mount. More details for IRFR420A can be seen below.