Thank you very much guys , this is what i finally went with for the design .
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2oz copper is an extreme , and this design can do well with just 1oz
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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 .
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a 0.2mm clearance is more than enough for this application , even near the 12v+ rail .
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i ramped the 12V line width to 2.1mm just for extra safety .
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the connector will fit just fine .
if you guys have any remarks i would like to hear them .
thank you .