The FTK123 from First Silicon is a MOSFET with Continous Drain Current 0.17 A, Drain Source Resistance 5.0 to 6.0 ohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 0.8 to 2.8 V. Tags: Surface Mount. More details for FTK123 can be seen below.