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October 2004

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Subject:
From:
Steve Gregory <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 19 Oct 2004 19:31:33 EDT
Content-Type:
text/plain
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Hi All!

Dave Hillman so kindly sent me a picture of some LCCC solder joints after
thermal cycling
after 500 thermal cycles of -55C to +125C (per IPC-9701 guidelines).
Needless to say it has failed! (CAUTION! Parental discretion is advised before
viewing!) Go to:

_http://www.stevezeva.homestead.com_ (http://www.stevezeva.homestead.com)

Look at: "LCCC after thermal cycling"

I build assemblies using LCCC's here, 32-pins or lower...mostly radar
stuff...been putting them on assemblies for as long as I've been  here. Don't know
exactly why our customer still uses them, maybe that's the  only package they
can get the devices in...and maybe the smaller packages don't  have the same
CTE mismatch problems.

There is a company that makes compliant SMT leads that can be attached to
LCCC components, and I think that they have a service that will do that for you.
 It's Interplex NAS, go to:

_http://www.interplexnas.com/index.asp_
(http://www.interplexnas.com/index.asp)

If you absolutely have to use LCCC's, and they're bigger than 32-pins, you
might check them out.

-Steve Gregory-

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