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From [log in to unmask] Wed May 15 17: |
58:57 1996 |
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--- Begin Included Message ---
From: [log in to unmask]
Date: 7 May 96
Subject: RE: ASSY: Dual LED failures.
To: uunet!zytec!uunet!manserve.com!Myron.Papiz
Myron:
If you have devices available from before the problem
re-surfaced, compare them to the ones that are currently
failing. We had a similar open LED problem and found that the
ones that failed had smaller "posts" or "flags" for die attach
inside the encapsulant/lense as compared to devices which did
not fail. The larger area apparently provides enough
heatsinking to prevent stress on the die attach or wire bond.
We also found that even though we call out one part number, the
LEDs could actually be coming from a number of different
manufacturers. Many companies such as IDI and Chicago
Miniature don't actually manufacture LEDs, but rather buy from
several sources and then re-sell or do value added (such as
your dual array) and sell. If you do indeed find a
construction difference between failing and non-failing
devices, I would insist on the one type only, and try to get
your source to divulge the original maker of both types.
Regards,
Pat Bailey
Supplier Quality Engineer
Zytec Corporation
507 637-2966 x355
[log in to unmask]
--- End Included Message ---
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