The MCU20N06B from Micro Commercial Components is a MOSFET with Continous Drain Current 20 A, Drain Source Resistance 37 to 45 milliohm, Drain Source Breakdown Voltage 60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for MCU20N06B can be seen below.