The Si8472DB from Vishay is a MOSFET with Continous Drain Current 4.5 A, Drain Source Resistance 36 to 70 Milliohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage 0.4 to 0.9 V. Tags: Surface Mount. More details for Si8472DB can be seen below.