The Si4848ADY from Vishay is a MOSFET with Continous Drain Current 5.5 A, Drain Source Resistance 7 to 13.3 milliohm, Drain Source Breakdown Voltage 150 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for Si4848ADY can be seen below.