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Subject:	Clarification of Conductor Thickness Spec
From:	[log in to unmask]
Reply To:	(Designers Council Forum)
Date:	Mon, 29 Apr 2002 09:43:15 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (46 lines)

Greetings Guru's-
I've got a double-sided board. Some traces on the board run 15A continuous.
Due to space constraints, I have to size the the traces for 2oz. copper.

Historically, on the drawing notes I've specified 2oz FINISHED copper
weight and not called out a starting weight (also specified .001" min/avg.
plating in holes). My thoughts were that I didn't care what the base copper
was as long as the end product met the callouts. Our good-old supplier
started with 1oz. and plated up to 2oz.

We are re-vamping all our standard notes to try to better reference IPC and
other specs. Global market, more outsourcing, all that. It seems I should
specify a starting copper thickness on the drawing, as well as a finished
copper thickness.

I'm reading IPC-6012 (page 14, table 3-9) and trying to understand why 2oz.
copper AFTER plating has a min. thickness of 76uM (.003"). Seems like it
ought to be .0038' (0.097uM). Is that because it's a MIN instead of an
average?

What do/would you put on the fab notes for starting and finished Cu thk.?
Quick responses would be appreciated.

Thanks,
-Chris

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