The AP4NA3R5HCST from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 22 to 107 A, Drain Source Resistance 3.8 milli-ohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for AP4NA3R5HCST can be seen below.