The Si5517DU from Vishay is a MOSFET with Continous Drain Current 6 A, Drain Source Resistance 32 to 131 Milliohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage -1 to 1 V. Tags: Surface Mount. More details for Si5517DU can be seen below.