The MSC180SMA120B from Microchip Technology is a MOSFET with Continous Drain Current 21 A, Drain Source Resistance 180 to 225 milliohm, Drain Source Breakdown Voltage 1200 V, Gate Source Voltage -10 to 23 V, Gate Source Threshold Voltage 1.9 to 3.26 V. Tags: Through Hole. More details for MSC180SMA120B can be seen below.