The AP3NA4R2AYT from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 16.7 to 66 A, Drain Source Resistance 4.2 to 7.8 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.3 to 2.3 V. Tags: Surface Mount. More details for AP3NA4R2AYT can be seen below.