The IRF820S from Vishay is a MOSFET with Continous Drain Current 2.5 A, Drain Source Resistance 3000 milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole, Surface Mount. More details for IRF820S can be seen below.