The FDMS4D4N08C from onsemi is a MOSFET with Continous Drain Current 123 A, Drain Source Resistance 4.3 milliohm, Drain Source Breakdown Voltage 80 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 4 V. Tags: Surface Mount. More details for FDMS4D4N08C can be seen below.