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October 2004

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From:
"Whittaker, Dewey (AZ75)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Whittaker, Dewey (AZ75)
Date:
Wed, 13 Oct 2004 09:55:43 -0700
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That logic is all wet behind the ears( tabs, pads, castellations etc. ). I
treat those as guidelines and require the ECM ( Electronic Contract
Manufacturer ), who knows the environmental conditions of the factory floor
and storage area, to be responsible for the acceptability of the device
prior to processing. If the device has exceeded the acceptable moisture
level, then he must demonstrate he has brought it back to an acceptable
level, prior to processing, by any process that meets the requirements
without being detrimental to all the other acceptance criteria.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Ryan Grant
Sent: Wednesday, October 13, 2004 9:23 AM
To: [log in to unmask]
Subject: [TN] J-STD-033A interpretation


Hi Technetters,

I'd like to solicit interpretations of J-STD-033A Handling, Packing,
Shipping and Use of Moisture Sensitive Devices.  In particular, I
mentioned to colleagues that simply resealing a moisture sensitive
device in its moisture barrier bag does not stop the clock for that
device.  They set me back in my place by pointing out that both sections
4.1.2.1 and 4.1.2.2 state the floor life can not only be stopped, but
also reset by "dry pack according to 3.3" and leaving the parts in
inventory for a sufficient length of time.  When I reference section
3.3, it covers sealing the parts in a Moisture Barrier Bag with
desiccant, but no reference to "drying".  Drying is covered in section
3.2!  How can I argue with that?!

In other words, if a level 5a part is left in the open for 8 hours
before resealing, after 3 1/2 days (10X the exposure time) of sitting
bagged in a warehouse, the part would be "dry" and the clock reset!
What a BONUS!  Otherwise, tape and reel parts might require up to 67
days of bake.

Although I can follow the lawyer speak, I don't see the logic.  Can
anyone straighten me out?

Thanks,
Ryan Grant

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