The AP4P040J from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current -12.4 to -19.6 A, Drain Source Resistance 40 to 60 milli-ohm, Drain Source Breakdown Voltage -40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -1 to -3 V. Tags: Through Hole. More details for AP4P040J can be seen below.