The Si4100DY from Vishay is a MOSFET with Continous Drain Current 6.8 A, Drain Source Resistance 5.1 to 8.4 milliohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4.5 V. Tags: Surface Mount. More details for Si4100DY can be seen below.