Inge, try to work in an environment with up to 60% humidity... we are baking
and baking again...
If we miss we are in big trouble.
Gaby
----- Original Message -----
From: "Ingemar Hernefjord (KC/EMW)" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, June 21, 2005 9:53 AM
Subject: Re: [TN] Moisture sensitivity levels...


> Steve,
> how come that you jumped high so sudden? Have you used some kind of
> humidity issue filter
> all these years...he-he..cheating. There is humidity everywhere. Mother
> nature infiltrates
> water vapour molecules everywhere she can. We learned that there is
> humidity even on inside
> of glass feedtrues, water penetrates deeply into kovar packages, there is
> water in the solder
> paste, every single "plastic" has a small amount of water on inside. Water
> molecules are
> universal and unavoidable. We had a period of humidity hysteria, digged
> deeply into the
> mystery of water penetration mechanisms by means of proffessors and
> doctors, had seminars,
> and the learned painted scaring scenarios about all bad things that could
> occur due to water in
> the material. We spent a lot of money on residue gas analysis and made
> lots of MIL STD
> tests and so on. The years pass and behold, a miracle: there has been no
> catastroph. Some
> few reports have been noticed, but the equipments spread all over the
> globe seem to work,
> and mounting seems to go on rather free from incidents despite there is
> water in every
> single component. So, I wonder if all anti-humidity countermeasures are
> proportional to the
> very few failures that occur due to water.
>
> My thoughts do not necesserarily represent the general opinion here, I'm
> just curious about
> the mystery of water content and others experience. Is humidity a severe
> problem today?
> Can anyone give example?
>
> (I don't include water that penetrates into packages from the surrounding
> during field use,
> but just point at built-in humidity in parts before and during assembly.)
>
> Ingemar Hernefjord
> Ericsson Microwave Systems
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Stephen Gregory
> Sent: den 20 juni 2005 17:26
> 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
> __________________________________________________________________
> This message may contain information that is privileged and confidential
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