The FTK4906DFN56 from First Silicon is a MOSFET with Continous Drain Current 44 to 70 A, Drain Source Resistance 6.5 to 12.0 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 FTK4906DFN56 can be seen below.