The MCU45N10 from Micro Commercial Components is a MOSFET with Continous Drain Current 45 A, Drain Source Resistance 14 to 21.5 milliohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for MCU45N10 can be seen below.