The Si4101DY from Vishay is a MOSFET with Continous Drain Current 25.7 A, Drain Source Resistance 5 to 8 milliohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -1 to -2.5 V. Tags: Surface Mount. More details for Si4101DY can be seen below.