The AP4052YT from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 16.3 to 51.7 A, Drain Source Resistance 6.5 to 11 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.3 to 3 V. Tags: Surface Mount. More details for AP4052YT can be seen below.