The AP3N045EN from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 3.3 to 4.3 A, Drain Source Resistance 45 to 60 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for AP3N045EN can be seen below.