Scott,

The via size will depend on the pitch of the BGA. Check out sources like
Motorola's End User Manual for BGA
Products (C4PKGUSERGUIDE/D).
I am currently using 25/13 vias for a 50mil pitch BGA. I have also seen
BGA's with a pitch so small that
the via has to be placed on the BGA PAD and filled.

Scott Buscomb
Techsonic Industries, Humminbird Marine Electronics
[log in to unmask]

Scott D. Shepard wrote:

> Hi,
>
> I've done layouts in many types of technologies, but not BGAs. I find
> myself finally needing some tips on the basics. I understand the trace
> pattern to wire up the device, but, how do i figure out whether I can
> use a via, say .02(.5mm) or if I must go to microvia technology. Any
> info will be helpful, ASAP! Were starting a hot project right now.
> Thanks in advance.
>
> Scott
>
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