The AP5521GM-HF from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 2.0 to 2.5 A, Drain Source Resistance 120 to 250 milli-ohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for AP5521GM-HF can be seen below.