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Reply To: | TechNet E-Mail Forum. |
Date: | Tue, 25 Jul 2000 10:07:08 -0400 |
Content-Type: | multipart/alternative |
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We are experiencing problems with soldering of PLCC's.
We find that a significant number of these devices are received from the vendor with non-coplanar leads. The lack of co-planarity causes open solder joints.
Investigation has resulted in the knowledge that approximately 5% of the PLCC device we receive are not within the 0.004" co-planarity requirement. We find some to be out as far as 0.012". I cannot currently define the point at which the lack of co-planarity becomes an issue.
The supplier is a major manufacturer of these devices. The parts are on tape and reel. We have inspected them prior to any processing at our facility, so we know that it is not a question of in-house handling, placement, etc.
1) Does anyone else see co-planarity problems with PLCC's?
2) What steps have you successfully taken to correct this problem, and what was the result?
3) Are there pieces of equipment I can put inline to screen <*gasp*> out these devices?
4) Any assembly or processing tricks you have used successfully to compensate?
Thanks,
Lang
x5046
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