The Si4228DY from Vishay is a MOSFET with Continous Drain Current 8 A, Drain Source Resistance 15 to 24 milliohm, Drain Source Breakdown Voltage 25 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 0.6 to 1.4 V. Tags: Surface Mount. More details for Si4228DY can be seen below.