The FTK3909S from First Silicon is a MOSFET with Continous Drain Current -3.2 to -5.1 A, Drain Source Resistance 27 to 46 milli-ohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -1.2 to -2.2 V. Tags: Surface Mount. More details for FTK3909S can be seen below.