Raye, although not a guru, please allow me to comment.

 Jason and Reuven I agree with. Further, I have put among the 6012 committee comments a request to simplify those tables for inner and outer copper thickness. Most of those columns can be eliminated, I believe, allowing for easier interpretation by those charged with acceptance.

IPC will circulate a draft of 6012 rev D after 1 Jan 2014 for industry review. I have already submitted some 20 requests for what I see as improvements.  Louis Hart

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rivera, Raye
Sent: Tuesday, December 10, 2013 12:13 PM
To: [log in to unmask]
Subject: [TN] IPC-6012C Total Cu thickness

Hello technet gurus,

I have a question regarding total copper thickness for external conductors.

3.6.2.13 states only a requirement for total conductor thickness, that is foil + plating, and references table 3-12 for the appropriate values. There is no requirement for the foil thickness.
Table 3-12 also has a column with heading:

Absolute Cu Min. (IPC-4562 less 10% reduction)

Does that column heading constitute a requirement?   Would using a copper foil less than the stated minimum constitute a rejectable condition even if total copper thickness meets requirements?

Engineering  states that they only care about the total thickness from a functional point of view.

I ask this because I have a difference of opinion with a colleague on the interpretation of the standard.

Best regards,
Raye Rivera

QA Manager * Canoga Perkins
20600 Prairie Street * Chatsworth * CA 91311-6008
818-678-3872  * [log in to unmask]<mailto:[log in to unmask]>



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