We
have seen an increase in cracking.
The root cause for us is depanelizing using a rotary style blade
cutter.
Caps and some filters too close to the edge are most subject to
damage
due to the forces imparted on the board when depanelizing.
Often we
can eliminate the problem by flipping the board over during
depanelize, but,
that does not always work and since we do not have the tools to
analyze the
forces during the depanelize process, any changes like flipping the
board
over is essentially a bit of a gamble.
-Carrie
Cracking Ceramic SMT Capacitors
" Is anyone
else seeing an increase in the number of cracked and shorting ceramic chip
capacitors? In our experience as a contract manufacturer we
have, in the past, seen the occasional instance of ceramic capacitors
cracking and shorting out. The cause of this problem is generally obvious,
as it is isolated to components situated in areas of the PCB that are
subject to flexing.
Recently however we have
seen more frequent instances of this problem; very often in areas of the
board that should not be experiencing any appreciable flex. Our process
has not changed and neither have our sources of these components. Have
chip capacitors themselves become more fragile?"
Rod Lafond
Manager, Quality Assurance and Technical
Training
APEX-Micro Manufacturing
Corporation
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