Hi Steve

I hope your question has been answered but if not here goes:

J-STD- 020B "Moisture/Reflow Sensitivity Classification for nonhermetic
solid state surface mount devices" provides the a standard to identify the
classification level of nonhermetic solid state surface mount devices that
are sensitive to moisture induced stress sothe that they can be properly
packaged, stored, and handled to avoid damage during assembly solder
reflow attachment and/or repair operations.

This document will provide a relative guide how to classify components for
both lead free and tin lead soldering.  If you have any Q's pls call me.

Regards,


Karen Walters Ebner
Raytheon Electronic Combat Systems
Towson, MD 21286
410.583.4082



Stephen Gregory <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
06/20/2005 11:25 AM
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[TN] Moisture sensitivity levels...






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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