The FTK4906D from First Silicon is a MOSFET with Continous Drain Current 31.6 to 50 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 FTK4906D can be seen below.