The Si5515CDC from Vishay is a MOSFET with Continous Drain Current 4 A, Drain Source Resistance 30 to 156 Milliohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage -0.8 to 0.8 V. Tags: Surface Mount. More details for Si5515CDC can be seen below.