An interesting problem.

My gut feel is that a 2N3904 is insufficiently specified, because the
datasheet need not say anything about ESD or isolation.  Each
production run of a 2N3904 will be different.  The processes keep
changing.  The device inside the package can get smaller.  Your 2N3904
isn't my 2N3904 in this respect.

Doing ESD tests on enough assembled units would characterise it though.

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James Cameron
http://quozl.linux.org.au/
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