The Si4464DY from Vishay is a MOSFET with Continous Drain Current 2.2 A, Drain Source Resistance 195 to 260 milliohm, Drain Source Breakdown Voltage 200 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for Si4464DY can be seen below.