The FDMS039N08B from onsemi is a MOSFET with Continous Drain Current 100 A, Drain Source Resistance 3.9 milliohm, Drain Source Breakdown Voltage 80 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 4.5 V. Tags: Surface Mount. More details for FDMS039N08B can be seen below.