The Si4126DY from Vishay is a MOSFET with Continous Drain Current 39 A, Drain Source Resistance 22 to 34 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 Si4126DY can be seen below.