The FTK4909 from First Silicon is a MOSFET with Continous Drain Current -4.1 to -6.5 A, Drain Source Resistance 37 to 72 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 FTK4909 can be seen below.