The Si4090BDY from Vishay is a MOSFET with Continous Drain Current 18.7 A, Drain Source Resistance 8.4 to 11.3 milliohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for Si4090BDY can be seen below.