The FTK4503 from First Silicon is a MOSFET with Continous Drain Current 5.5 to 6.9 A, Drain Source Resistance 22 to 55 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.0 to 3.0 V. Tags: Surface Mount. More details for FTK4503 can be seen below.