The FTK3443S from First Silicon is a MOSFET with Continous Drain Current -4.7 A, Drain Source Resistance 22 to 70 milli-ohm, Drain Source Breakdown Voltage -20 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage -0.6 to -1.4 V. Tags: Surface Mount. More details for FTK3443S can be seen below.