The FTK4001E from First Silicon is a MOSFET with Continous Drain Current 238 mA, Drain Source Resistance 1.5 to 3.5 ohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -10 to 10 V, Gate Source Threshold Voltage 0.5 to 1.5 V. Tags: Surface Mount. More details for FTK4001E can be seen below.