The AP3P050AG from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current -3.2 to -4.1 A, Drain Source Resistance 50 to 75 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 AP3P050AG can be seen below.