The Si4056ADY from Vishay is a MOSFET with Continous Drain Current 8.3 A, Drain Source Resistance 24.3 to 33 milliohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for Si4056ADY can be seen below.