The Si4204DY from Vishay is a MOSFET with Continous Drain Current 19.8 A, Drain Source Resistance 3 to 6 milliohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.4 V. Tags: Surface Mount. More details for Si4204DY can be seen below.