for your .8mm BGA what trace line width and air gap do you use? what ball pad size? what via dia and via hole ?

i have been stuggling with these issues
once setup and rolling BGAs don't worry me too much
but building the first 2 pcs for test is always a struggle

thanks for any help

Dennis Saputelli

_______________________________________________________________________
Integrated Controls, Inc.           Tel: 415-647-0480  EXT 107
2851 21st Street                    Fax: 415-647-3003
San Francisco, CA 94110             www.integratedcontrolsinc.com


Indrek Rebane wrote:
Hi Jim,

Jim Monroe wrote:

Is anyone reliably designing and building boards using .5 mm pitch BGA's? We're currently doing a layout using these little monsters!


Have used for over a year now. Just received boards with two 0.5mm BGA's
on yesterday. Still, we mostly use 0.8mm BGA's due ease of routing
without using microvias.

Can anyone recommend a good fab house for this kind of design?


DDi Tewkesbury in UK. They also do 75um traces (approx 3mil).
http://www.eu.ddiglobal.com/

I have also heard good words about Sanmina-SCI, but never used them:
http://www.sanmina-sci.com

There are others.

Indrek




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