The AP8N4R2MT from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 21 to 120 A, Drain Source Resistance 4.2 milli-ohm, Drain Source Breakdown Voltage 80 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 5 V. Tags: Surface Mount. More details for AP8N4R2MT can be seen below.