The Si4401FDY from Vishay is a MOSFET with Continous Drain Current -14 A, Drain Source Resistance 11.8 to 18.3 milliohm, Drain Source Breakdown Voltage -40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -1 to -2.3 V. Tags: Surface Mount. More details for Si4401FDY can be seen below.