The AP1504M from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 3.6 to 4.5 A, Drain Source Resistance 59 milli-ohm, Drain Source Breakdown Voltage 150 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for AP1504M can be seen below.