The Si4447ADY from Vishay is a MOSFET with Continous Drain Current -7.2 A, Drain Source Resistance 36 to 62 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 Si4447ADY can be seen below.