The MCAC50N03 from Micro Commercial Components is a MOSFET with Continous Drain Current 50 A, Drain Source Resistance 3.9 to 6 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for MCAC50N03 can be seen below.