Steve,
Size is not the only criteria. It is also the type of plastic used to
make the component. And then of course the supplier should be testing as
per the IPC spec to set the MSL level.
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stephen Gregory
Sent: June 20, 2005 11:26 AM
To: [log in to unmask]
Subject: [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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