Re: [SI-LIST] : Recommendations for High Density PCB to PCB Connection

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From: Gregg Fokken (fokken.gregg@mayo.edu)
Date: Wed Nov 03 1999 - 07:22:18 PST


I thought the pitch would be 50 mils for an array connection and 12.5 mils
at the trace level (200 mils * 500 mils / 40 connections). Laurence - how
did you get to 2.5 mils/connection? I've used controlled impedance AMP
connectors that had an effective 12.5 mil pitch (two rows at 25 mil pitch
per row), however, with the connector housing I think you would be over
your allotted space. Might want to check AMP's web site in case they have
anything in a smaller form factor.

On Nov 3, 9:47am, Laurence Michaels wrote:
> Subject: Re: [SI-LIST] : Recommendations for High Density PCB to PCB
Conne
> Doug Piper wrote:
> >
> > I'm working on a new project that requires me to make 40 connections
from
> > one PCB to another in a space that's only about 0.2" x 0.5". Does
anyone
> > have any experience or recommendations for making a connection of this
> > density?
> >
> > Doug Piper, Woven Electronics, P.O. Box 189, Mauldin, SC 29662
> > PH 864-967-1751, FAX 864-963-1761, e-mail:
doug.piper@wovenelectronics.com
> > www.wovenelectronics.com
>
> Only recommendation I can make, is possibly some of the press-fit
> unidirectionally conductive foam material, such as is used on some of
> the more recent Intel Flash chips.
>
> Having done a few calculations, this works out to 400 connections per
> square inch. If you manage to put more connections in an inch, than
> most cotton sheets, I want to know how you did it! Connections on the
> trace level are going to be tight as well. This is going to be 1
> connection per 2.5 square mils. Assuming equal trace and space
> requirements, this works out to 0.625 mil trace and space. That's not a
> standard PCB you're talking about. Are you sure about the space
> requirements?
>
> Best of luck,
> --
> Laurence Michaels
>
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>-- End of excerpt from Laurence Michaels

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