The AP4028EH from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 28 to 45 A, Drain Source Resistance 7.7 to 20 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for AP4028EH can be seen below.