Conformal coating defects and solutions
Figure 1. Satisfactory coating on PLCC Figure 2. Satisfactory coating on an SOIC. Figure 3. Satisfactory dip coating on an SOIC.
terminations.
Figure 4. Coating capillary action. Figure 5. Satisfactory coating on PLCC. Figure 6. Conformal coating contamination.
Figure 7. Coating lifting on a QFN. Figure 8. Copper dendrite failure. Figure 9. Interactive CD-ROM features many of the
common defects.
insulation resistance (SIR) when Bob Willis is a process engineer working in
exposed to a controlled environment. the electronics industry, providing training,
Copper dendrite formation is one consultancy and product failure analysis. Bob
of the most common failure modes also offers on site workshops on conventional
experienced. and lead-free for customers. He will be running
A new interactive CD-ROM, workshops at ITRI Merlin Circuits during
“Introduction to Conformal Coating October-November and at IPC MidWest and
Process Inspection and Defect Guide,” SMTA International in September—details at
has been produced with the support
www.bobwillis.co.uk. Bob is happy to assist you
from Gen3 Systems, Humiseal and SCH set up and optimise production lines for users
Technologies and features many of the and also provides conferences and workshops
common defects. The CD is available worldwide.
in the US from IPC and SMTA and
ElectronicsCA in Canada.
www.globalsmt.net Global SMT & Packaging – September 2009 – 5
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