The Si4599DY from Vishay is a MOSFET with Continous Drain Current 6.8 A, Drain Source Resistance 29.5 to 62 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -1.2 to 3 V. Tags: Surface Mount. More details for Si4599DY can be seen below.