0.2 mm sounds OK, but it's only eight
thousandths of an inch. Any defect, even a change of
hardness/annealing, in the copper creates a stress-concentration
point, leading to a crack. I think you should make the tracks as
wide as possible, for good reliability.
On 2024-01-11 16:01, Robert via
groups.io wrote:
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The lines
concerned are I2C clock and data, and yes, I will be
considering them as transmission lines.?? However, there's no
point
laying something down that is electrically just fine if the board
cannot
be manufactured reliably or the tracks break during assembly (it
will
get bolted down, but before that happens someone will have to pick
it up
and move it into position).
Chinese PCB houses can routinely achieve 0.15 mm on normal sized
boards.
? So am I worrying about nothing, because they will in fact have
no
trouble with a track (say) 0.2 mm wide and 500 mm long, if that's
what I
would choose from an electrical viewpoint?
Regards,
Robert.
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John Woodgate