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For normal signals with medium density board trace width(TW) =6 mil or 8 mil and spacing 6mil or 8 mil.
For high density board 4mil or 5 mil TW and 4 mil spacing or 5mil spacing.
But you need to consider the current rating and temperature of operation, environmental condition too as all contributes to trace width and spacing changes.
High voltage signals if present need proper clearance and creepage.
High current signals need proper trace width and coper flooding.
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