The Si4931DY from Vishay is a MOSFET with Continous Drain Current 8.9 A, Drain Source Resistance 14.5 to 28 milliohm, Drain Source Breakdown Voltage -12 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage -0.4 to -1 V. Tags: Surface Mount. More details for Si4931DY can be seen below.