Hi Bill,

For .8 mm pitch BGAs, you shouldn't have to use
via-in-pad.  You should be able to use 19 mils via
pads with 10 mils vias in Dog bone design.

Ted
--- "Brooks,Bill" <[log in to unmask]> wrote:
> I have a board to do that is incorporating a .8mm
> pitch BGA chip on it and I
> am gathering info on the layout suggestions for that
> type of pad geometry.
> Do any of you have experience with this type of
> layout challenge that you
> would be willing to share?
>
> There are suggestions out there that incorporate HDI
> 'via-in-pad' solutions
> and others suggest 'Dog-boning' a .45mm [.018"] via
> pad with a .2mm [.008"]
> plated thru hole in it. I would really like to hear
> from someone who has
> done this successfully and also some of the problems
> they encountered.
>
> Thanks in advance.
>
>
> Bill Brooks, CID
>
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