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June 2005

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Subject:
From:
Graham Collins <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Graham Collins <[log in to unmask]>
Date:
Tue, 21 Jun 2005 07:49:30 -0400
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Hi Steve!
Had a great Father's day - how my 6.5 month old dragged that bottle of
scotch in I do not understand, but I'll take it.  Whoo-hoo!

As for MSL levels, we are seeing some of the same thing I think you
are.  We buy lots of parts through distributors, who repackage them in
the small quantities we need.  The packaging they use sometimes
indicates a MSL level a couple of values higher than it should.  Just a
few days ago our SMT operator had me check one where he had two
packages, one indicating MSL=2, one indicating MSL=3, and when I checked
the Ti web site it showed a MSL=1.  I'm guessing the distributor is
being overcautious and/or marking it up for lead-free processing.  I
agree, it's a pain - as we have to either err on the side of caution and
end up baking parts that don't need to be baked, or we verify each one
against the manufacturer's data.

regards,

Graham Collins
Process Engineer,
L-3 Communications Electronic Systems Inc.
Halifax
(902) 873-2000 ext 6215

>>> [log in to unmask] 06/20/05 12:25PM >>>
Good mornin' all!

I hope all you Dads out there had a wonderful Fathers Day!

As I posted about a week or so ago, we're getting our stockroom
personnel to really focus on component moisture sensitivity levels.

But now I'm starting to get a little confused about how components
are generally classified with their respective MSL ratings.

I've always thought that it had to do with component body size and
thickness,
but now I'm finding out that it doesn't necessarily.

My stockroom clerk showed me an IDT SOJ28 that came in sealed with a
MSL 3
rating that we now have in our dry box because the package was opened.

We have some Cypress SOJ28's and SOJ24's that are on reels that are not
in
original packaging, so I called Cypress and asked what the MSL rating
is
for the
two part numbers and they are a MSL 1. Cypress gave me a link to the
SRAM
Qualification Report that states that.

Now my stockroom clerk brought me some Vishay tantalum caps that have
a MSL 2a rating label on them, and they are TNTC's. This is THE FIRST
time
I
have ever seen a MSL label on a tantalum capacitor.

Are these ratings based on qualification reports? Or can one look at
the
size and
thickness of the part to base how you will handle it?

Kind regards,

-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
__________________________________________________________________
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above.
If you are not the intended recipient, you may not copy, use or
deliver
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kindly notify the sender by reply e-mail.

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