The Si4288DY from Vishay is a MOSFET with Continous Drain Current 9.2 A, Drain Source Resistance 16.5 to 23 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.2 to 2.5 V. Tags: Surface Mount. More details for Si4288DY can be seen below.