I know the IPC spec. for bow and twist is 0.75% on a PCB but what about a
PCBA?  Is the spec the
same? If there is no spec is there a rule of thumb?   I have a 12"x4"
0.062" FR4 PCBA with a bow
in it that I need to determine if it is within industry standards.  I need
to know what to put into our
 worst case mechanical stress model.  Thank you in advance.

Best Regards,

Mike Forrester
LeCroy Corporation

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