The FTK3904 from First Silicon is a MOSFET with Continous Drain Current 19 to 30 A, Drain Source Resistance 3.8 to 6 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.2 to 2.5 V. Tags: Surface Mount. More details for FTK3904 can be seen below.