The AP3P055N from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current -3.1 to -3.9 A, Drain Source Resistance 55 to 85 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 AP3P055N can be seen below.