The Si4122DY from Vishay is a MOSFET with Continous Drain Current 27.2 A, Drain Source Resistance 3 to 6 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -25 to 25 V, Gate Source Threshold Voltage 1.2 to 2.5 V. Tags: Surface Mount. More details for Si4122DY can be seen below.