The AP4N4R2H from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 52.8 to 83 A, Drain Source Resistance 4.2 to 7.2 milli-ohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for AP4N4R2H can be seen below.