The FTK9452 from First Silicon is a MOSFET with Continous Drain Current 4 A, Drain Source Resistance 0.038 to 0.8 ohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 0.70 to 1.50 V. Tags: Surface Mount. More details for FTK9452 can be seen below.