The AP4NA1R4CMT-A from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 39 to 223 A, Drain Source Resistance 1.4 to 2.5 milli-ohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for AP4NA1R4CMT-A can be seen below.