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July 2002

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Wed, 17 Jul 2002 08:20:04 -0400
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scary!
                                 jk

>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]]On Behalf Of David Douthit
>Sent: Tuesday, July 16, 2002 6:47 PM
>To: [log in to unmask]
>Subject: Re: [TN] Moisture Sensitive Device Levels - A Reliability
>Indicator ?
>
>
>Paul,
>
>The following is the DoDs position on 217F:
>
>I received this e-mail and I am glad to see that someone is working a
>replacement for Mil Hdbk 217. As you  may know, the DSIC made a decision
>several years ago to let Mil Hdbk 217 "die a natural death". This is still
>the current OSD position i.e. we will not support any updates/revisions to
>Mil Hdbk 217.
>
>George Desiderio, Deputy Director
>Systems Engineering
>OUSD(AT&L)/Interoperability
>Tel: 703/695-2300
>Fax: 703/614-9884
>Cell: 703/582-7644
>eMail: [log in to unmask]
>
>David A. Douthit
>Manager
>LoCan LLC
>
>
>Paul Signorelli wrote:
>
>> i have a question about  the new families of MSD components we
>have recently been seeing.
>> There is now a new group of components being rated as Moisture
>Sensitive Devices, that are not IC's.  e.g.: LED's, Capacitors, etc....
>>
>> Is the MSD level now becoming a Quality Level indicating the
>Quality or Reliability of the part instead of the vapor
>transmissiblity of the package to prevent the 'Popcorning' problem ?
>> Should i purchase a level 2 (non-IC) part from one mfgr, rather
>than a level 3 (non-IC) part from another because it has
>successfully passed the Level 2 MSD qualification tests ?
>> Are some (non-IC) manufacturers using the MSD Rating system to
>hide quality defects or inadequate high temperature construction
>materials ?
>> i would suggest that anyone having component failures of these
>new MS devices
>> perform detailed component failure analysis to see if there is a
>MS vapor transmission (popcorn) failure or some other high
>temperature failure mechanism (like reversion, epoxy degradation,
>or CTE problems).
>>
>> This all could result in a new revision of MIL-HDBK-217 to add
>'Pi sub MSD' factors.
>>
>> Paul Signorelli
>> Sanmina-SCI
>>
>>
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