The MCM3400A from Micro Commercial Components is a MOSFET with Continous Drain Current 5 A, Drain Source Resistance 29 to 45 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 0.7 to 1.5 V. Tags: Surface Mount. More details for MCM3400A can be seen below.