The Si4463CDY from Vishay is a MOSFET with Continous Drain Current -18.6 A, Drain Source Resistance 6 to 14 milliohm, Drain Source Breakdown Voltage -20 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage -0.6 to -1.4 V. Tags: Surface Mount. More details for Si4463CDY can be seen below.