The FDMT800120DC from onsemi is a MOSFET with Continous Drain Current 128 A, Drain Source Resistance 4.2 milliohm, Drain Source Breakdown Voltage 120 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 4 V. Tags: Surface Mount. More details for FDMT800120DC can be seen below.