The FTK4903DFN56 from First Silicon is a MOSFET with Continous Drain Current -38 to -60 A, Drain Source Resistance 10.8 to 20.5 milli-ohm, Drain Source Breakdown Voltage -40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -1.2 to -2.5 V. Tags: Surface Mount. More details for FTK4903DFN56 can be seen below.