The AP4NA2R4I from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 55 to 88 A, Drain Source Resistance 2.4 to 4 milli-ohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Through Hole. More details for AP4NA2R4I can be seen below.