The AP1504LM from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 3.5 to 4.4 A, Drain Source Resistance 60 to 120 milli-ohm, Drain Source Breakdown Voltage 150 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for AP1504LM can be seen below.