The Si4143DY from Vishay is a MOSFET with Continous Drain Current 25.3 A, Drain Source Resistance 5.1 to 8.4 milliohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -25 to 25 V, Gate Source Threshold Voltage -1 to -2.5 V. Tags: Surface Mount. More details for Si4143DY can be seen below.