The FTK4959D from First Silicon is a MOSFET with Continous Drain Current -57 to -90 A, Drain Source Resistance 4.7 to 8.3 milli-ohm, Drain Source Breakdown Voltage -40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -1.2 to -2.5 V. Tags: Surface Mount. More details for FTK4959D can be seen below.