--- 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 ---