The Si4425FDY from Vishay is a MOSFET with Continous Drain Current -18.3 A, Drain Source Resistance 7.7 to 16 milliohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -1 to -2.2 V. Tags: Surface Mount. More details for Si4425FDY can be seen below.