The AP12A390YT from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 1.3 to 1.7 A, Drain Source Resistance 390 to 600 milli-ohm, Drain Source Breakdown Voltage 120 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for AP12A390YT can be seen below.