The FTK4912D from First Silicon is a MOSFET with Continous Drain Current 14.5 to 23 A, Drain Source Resistance 25 to 40 milli-ohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.2 to 2.5 V. Tags: Surface Mount. More details for FTK4912D can be seen below.