Hi Rigo - yes, Doug would give you the standard " it depends" response
because as you detailed,there are too many inputs to your question. The
reason that the IPC-1601 committee only put suggested values in the
standard is that clear, data determined, industry wide applicable values
for requirements could not be established. The committee is continuing to
investigate, research and gather published data on that task. Establishing
industry wide applicable values is a difficult task as the committee does
not want to impose any requirements that are not based on data and are not
value added for the industry.
Dave Hillman
Rockwell Collins
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Subject
[TN] How do we determine the Maximum Acceptable Moisture Content (MAMC)
for a board?
Hi everybody,
Does anybody know how do we determine the Maximum Acceptable Moisture
Content (MAMC) for a board?
I understand that IPC-1601 states that for most designs a MAMC between
0.1% and 0.5% of moisture weight to resin weight is adequate. However, it
does not describe the basis to establish the range. I can think of many
variables that can affect this number like minimum pitch, voltage across,
component clearance, whether the board gets conformal coating or not, etc.
I would like to know if anybody knows of a safe method to determine the
MAMC for a given board.
Paul... I can already see your "it depends" coming... :)!
Thanks for the help!
Rigo Garcia
Sr. Quality Assurance Engineer
Workmanship Standards, Code 300
NASA, Goddard Space Flight Center
Greenbelt, MD 20771
Phone. (301) 286-6129
Fax. (301) 286-6576
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