The APL501J from Microchip Technology is a MOSFET with Continous Drain Current 43 A, Drain Source Resistance 120 milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Screw Mount. More details for APL501J can be seen below.