The APT42F50S from Microchip Technology is a MOSFET with Continous Drain Current 42 A, Drain Source Resistance 130 milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2.5 to 5 V. Tags: Surface Mount. More details for APT42F50S can be seen below.