Hi Raye,

As a fabricator, I only consider total thickness as a requirement.

Best Regards,

Jason Zhao
VP of North America Operations
Sunshine Circuits
3400 Silverstone Drive, Suite 139, Plano, TX 75023
US Cell 510-468-4412, China Cell 131-62722392
High Mix, High Tech, Low-Mid Volume PCB Manufacturer
www.sunshinepcbgroup.com


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rivera, Raye
Sent: Tuesday, December 10, 2013 11:13 AM
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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