What is this component? D5SV17
The massive planes and the small tap off of the gate suggest a switching power supply design, so I assumed a power MOSFET.  The Q on the silkscreen is another telling sign.  This marking chart looks much the same, note the line over the year and week.



In addition this pinout looks about right to the usage.  The only confusion is the capacitor between gate and source.  A little bit of context might help that.  Hope this helps.