The FTK3906D from First Silicon is a MOSFET with Continous Drain Current 51 to 80 A, Drain Source Resistance 4.8 to 9 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for FTK3906D can be seen below.