The Si4850BDY from Vishay is a MOSFET with Continous Drain Current 11.3 A, Drain Source Resistance 5.2 to 17 milliohm, Drain Source Breakdown Voltage 60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.8 V. Tags: Surface Mount. More details for Si4850BDY can be seen below.