The AP3840CDT33 from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 20 to 48.6 A, Drain Source Resistance 3.7 to 4.7 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 1.1 to 1.9 V. Tags: Surface Mount. More details for AP3840CDT33 can be seen below.