Mike,

I would not classify a non-functional pad as extraneous copper. The pad 
is electrically connected to the circuit net, through the via, and is a 
design wanted feature, however small it may be. Extraneous copper is 
defined as "unwanted" metal that remains on the base material after 
chemical processing.

Regards,

Gary


On 8/17/2010 6:06 PM, Mike Hill wrote:
> Randy,
>
> The smaller non-functional pad should be considered as extraneous copper which are allowed per paragraph 3.12 as long as they do not affect functional integrity.
>
> Mike Hill
> Quality Manager
> Colonial Circuits, Inc.
>
> -----Original Message-----
> From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Reed, Randy
> Sent: Tuesday, August 17, 2010 4:33 PM
> To: [log in to unmask]
> Subject: [IPC-600-6012] Non-Functional Land Registration and Annular Inspection
>
> IPC-6012 has no guidance on the management of non-functional lands (that
> I can find) concerning registration and annular ring limits.
>
>
>
> The scenario causing problems is designs where the non-functional pad
> size is smaller than the functional pad size.  I am not trying to debate
> whether this is a good design practice.
>
>
>
> What is the intent of IPC-6012?  Should boards with registration and/or
> annular ring failures on non-functional lands, with the smaller pad
> size, be considered non compliant?
>
>
>
> Randy
>
>
>
> Randy Reed, CQE
>
> Reliability Lab
>
> Viasystems Group Inc.
>
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