The AP4N3R2I from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 48 to 75 A, Drain Source Resistance 3.2 milli-ohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.8 to 4 V. Tags: Through Hole. More details for AP4N3R2I can be seen below.