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June 2005

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Subject:
From:
Gabriela Bogdan <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Gabriela Bogdan <[log in to unmask]>
Date:
Wed, 22 Jun 2005 13:15:05 +0300
Content-Type:
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Yes, MS classed, but humidity exposure tracking was not done properly.
Biggest problems with mixed batches on the floor.
Gaby
----- Original Message -----
From: "Ingemar Hernefjord (KC/EMW)" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, June 22, 2005 10:15 AM
Subject: Re: [TN] Moisture sensitivity levels...


> Hi Gaby,
>
> we do have 60% too, all mounting area is 50-60% in order to get low ESD
> risk.
> And still, most reels have no baking. Tantalum epoxy molded, resistors,
> ceramics,
> SOTs, QFPs etc are exposed to the humidity in the assembly halls. And they
> are
> soldered with no problems, as far as I know. Millions of them.
>
> Exceptions: superBGAs and very large QFPs which are MS classed by the
> component
> maker himself. These are stored in nitrogen cabinets or in plastic bags
> with
> dessicators. So, MS classed components are handled with care.
>
> You did not tell us what components caused big trouble. Were they MS
> classed ?
>
> Inge
>
> -----Original Message-----
> From: Gabriela Bogdan [mailto:[log in to unmask]]
> Sent: den 21 juni 2005 16:40
> To: TechNet E-Mail Forum; Ingemar Hernefjord (KC/EMW)
> Subject: Re: [TN] Moisture sensitivity levels...
>
>
> 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
>> to
>> LaBarge, Inc.  It is for use only by the individual or entity named
>> above.
>> If you are not the intended recipient, you may not copy, use or deliver
>> this message to anyone.  In such event, you should destroy the message
>> and
>> kindly notify the sender by reply e-mail.
>>
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