The MSC040SMA120B4 from Microchip Technology is a MOSFET with Continous Drain Current 66 A, Drain Source Resistance 40 to 50 milliohm, Drain Source Breakdown Voltage 1200 V, Gate Source Voltage -10 to 23 V, Gate Source Threshold Voltage 1.8 to 2.6 V. Tags: Through Hole. More details for MSC040SMA120B4 can be seen below.