how can i tell if device is rated for 5v or 3.3v ?

Thank you very much guys , this is what i finally went with for the design .

  • 2oz copper is an extreme , and this design can do well with just 1oz
    .

  • i went with HASL with lead , it seems to have sufficient endurance . also went with that to avoid the higher temperatures and lack of compatibility of some parts with ROHS surface finishes .

  • a 0.2mm clearance is more than enough for this application , even near the 12v+ rail .

  • i ramped the 12V line width to 2.1mm just for extra safety .

  • the connector will fit just fine .

if you guys have any remarks i would like to hear them .
thank you .