The AP50AN270I from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 18 A, Drain Source Resistance 0.27 ohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for AP50AN270I can be seen below.