We are running SMT products and have been for some time now. First, I wanted to check with you folks to see what an acceptable FPY rate, or what you would consider and acceptable rate, is. Secondly, we are having issues primarily with product that use QFN packages with 20 and 24 pins. We are experiencing solder shorts and deficiency of solder. Some are 30 mil arrays and seem to have more issues than the 60 mil. Thise are also small pcbs, 20/24-up panelizations.
I want to know what your experience is with such issues, possible fixes, and what you would consider an acceptable FPY rate. We know what ours is but don't have a benchmark to compare it to. On the products in question, we are running about 95% on functional and 80% on ICT. This points to a definate process problem (which is why I ask about the soldering issues we are having).
I feel an FPY rate of 97% on the ICT and 99% on FT is acceptable and achievable, but we have to work out these issues to get there. Thanks in advance for any suggestions you may have.
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