Keith Short wrote:

> Hi All,
>         We are about to use a 0.8mm pitch uBGA on our latest design, and
> as we only
> have the one device of this type on the board, would like to avoid using
> uVias.
>         Has anyone routed this type of device using conventional vias.
>
>         We use a 0.45mm pad on the uBGA.
>
>         Any help and/or suggestions would be appreciated.
>
> Thanks
> Keith
>
> ------------------------------------------------------------------------
> -----
> Keith Short                    email: [log in to unmask]
> Telecom Modus Ltd.               Tel:  +44 1372 804811
> Cleeve Road                        Fax :  +44 1372 804804
> Leatherhead Surrey KT22 7SA UK

It depends on the pin count.  Up to 48 pins on a full array you can route out
completely on the top side with 5 mil traces, but we automatically go to
microvias as soon as the pin count exceeds 48.

John Bradley
Alcatel USA
Plano, TX

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