The FTK138D from First Silicon is a MOSFET with Continous Drain Current 200 mA, Drain Source Resistance 3.5 to 10 ohm, Drain Source Breakdown Voltage 50 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 0.5 to 1.5 V. Tags: Surface Mount. More details for FTK138D can be seen below.