The Si4164DY from Vishay is a MOSFET with Continous Drain Current 30 A, Drain Source Resistance 2.6 to 3.9 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.2 to 2.5 V. Tags: Surface Mount. More details for Si4164DY can be seen below.