use Jedec standards 95 or data book of manuf e.g. Altera,Intel, teressca
.

ashok

> ----------
> From:         Dave Pick -"process engineer"[SMTP:[log in to unmask]]
> Sent:         March 27, 1998 4:40 PM
> To:   [log in to unmask]
> Subject:      [TN] BGA package dimensions
>
> I am looking for a good source of dimensions for standard BGA
> packages. Are
> there any recommendations?
>
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