Bright ideas??? Bright ideas!!! I got bright ideas. In order of decreasing luminosity: * Stop installing the socket, solder the PLCC to the board, dip the board. The socket is a waste of time and money. You never replace the PLCC in the field, anyhow. Even if you do, it�s not because the PLCC is bad, it�s because the socket / PLCC interconnect has degraded. * Keep the socket, insert the PLCC, dip the board. That will help keep the socket / PLCC interconnect from degrading. * Keep the socket, insert the PLCC, don�t dip the board. The socket / PLCC is probably your greatest source of environmental problems. So, protecting everything but the main problem is a waste of time and money. * Use rubber boots to cover the socket during coating. Source of ESD boots: Caplugs Protective Industries LLC 2150 Elmwood Ave Buffalo, NY 888-227-5847 http://www.caplugs.com/
Sorry. I know of only one source for ESD protected boots. Other reputable sources of boots that may be ESD protected are: * Kinnarney Rubber 450 Main St PO Box 37 Mantua, NJ 08051 856-468-1320 FAX 7438 jimk@kinnarney.com
* Dempsey Industries 802 N. 4th St Miamisburg, OH 45342 (937)-866-2345 Gary Pascoe * Shercon somewhere in CA * Harman 360 South St. Rochester, MI 810-651-4477 * StockCap St Louis MO 800-827-CAPS (2277) * MOCAP Plastic Products Group 10964 Lin-Valle Drive, St. Louis, MO 63123 800-633-6775 314-845-3100 Fax 487-8855 http://www.mocapinc.thomasregister.com/olc/mocapinc/
�IPC-HDBK-830, Guidelines for Design, Selection and Application of Conformal Coatings� says words to the effect of: A conformal coating may have several functions depending on the type of application. The most common are: * Inhibit current leakage and short circuit due to humidity and contamination from service environment. * Inhibit corrosion. * Improve fatigue life of solder joints to leadless packages. * Inhibit arcing, corona and St. Elmo�s Fire. * Provide mechanical support for small parts that cannot be secured by mechanical means, to prevent damages due to mechanical shock and vibration.
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