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The volume of C-4 pads is critical for chip joining. The importance of this parameter increases as the number of C-4 joints which require simultaneous solder-joining increases.
English (United States)
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Method for Aiding Visual Inspection of C 4 Pads
The volume of C-4 pads is critical for chip joining. The importance of this
parameter increases as the number of C-4 joints which require simultaneous
Visual inspection of the C-4 pad volume is difficult since the pads are viewed
from the top and the operator does not have a three-dimensional view. It has
been found that the use of a tool to flatten the C-4 pads to a controlled height
greatly facilitates visual inspection. C-4 pads having a height below the
controlled height will not be contacted, or deformed, by the tool. The C-4 pads
deformed by the tool visually stand out from the C-4 pad or pads not deformed
(not contacted) by the tool.