The FTK3401A from First Silicon is a MOSFET with Continous Drain Current -3.5 to -4.2 A, Drain Source Resistance 42 to 90 milli-ohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage -0.7 to -1.3 V. Tags: Surface Mount. More details for FTK3401A can be seen below.