The Si4403DDY from Vishay is a MOSFET with Continous Drain Current -15.4 A, Drain Source Resistance 10.5 to 30 milliohm, Drain Source Breakdown Voltage -20 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage -0.4 to -1 V. Tags: Surface Mount. More details for Si4403DDY can be seen below.