The AP4028EJB from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 28 to 45 A, Drain Source Resistance 9 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: Through Hole. More details for AP4028EJB can be seen below.