No, not for class 3. The IPC-A-600 requirement is the same no breakout.

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Dam, Phil
> Sent: Thursday, August 22, 2002 5:16 PM
> To: [log in to unmask]
> Subject: [TN] IPC 6012 External A/Ring Specs for Class 3 PWB
> Perfomance
>
>
> A question concerning IPC 6012 Spec.
> Section 3.4.3 'Anular Ring (External)'  (pg 7) states "Plated
> through holes identified as vias can have up to 90 degree
> breakout of the annular ring if
> it does not occur at the conductor and land intersection."
> On the next
> page Table 3-5 Mininum Internal and External Annular Ring for
> Class 3 Performance states "The minimum external annular ring
> shall not be less that
> 50 um [0.0020"]" . No mention of the via hole exception.   Is
> 90 degree
> breakout on external vias allowable (as long as it is not at
> the pad -trace
> interface) for Class 3 pwb's?
>
> Thanks for the replies:
>
> Phil Dam
> EMC-OVO
>
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