Hi Steve,

Great picture.  I showed it to some of my SMT operators, they were
instantly concerned and wanted to know which operation that had occurred
on.
I led them on for awhile before I told them where I got it from.  It would
be better however to take the fifth on the weekend, that way you can enjoy
it better.

Thanks


                        P.  Lance Mayes
                        Mfg. Trainer




Steve Gregory <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
10/19/04 05:31 PM
Please respond to TechNet E-Mail Forum; Please respond to SteveZeva


        To:     [log in to unmask]
        cc:
        Subject:        [TN] Picture of LCCC Solder Joints...


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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