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May 2000

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Subject:
Re: External Annular Ring for Blind Via in Pad BGA Design?
From:
"Howieson, Rick" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 17 May 2000 12:00:23 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (47 lines) 
IPC-2221, annular ring is annular ring regardless of blind or through.
Rick
GTC

>-----Original Message-----
>From:  Patterson, Dawn D. [SMTP:[log in to unmask]]
>Sent:  Wednesday, May 17, 2000 11:00 AM
>To:    [log in to unmask]
>Subject:       [TN] External Annular Ring for Blind Via in Pad BGA Design?
>
>I believe I have searched through all the latest IPC specifications.  I've
>not found any specific criteria that cover the Design and/or Finished board
>requirements related to external annular rings on Blind Vias, let alone the
>requirements when the design is via in pad for a .8mm BGA.  I believe we are
>in new territory.  Any information would be greatly appreciated.
>
>Dawn Patterson
>
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