One thing I forgot to mention is that, in my experience, at least SMD
resistors are pretty useless for reducing ESD current. My hunch is that the
same is true for carbon film or metal film through-hole resistors, too, but
I haven't tested that. Usually the ESD voltage will just jump right across
an SMD resistor. Even if it doesn't manage to do that, it can damage the
resistor (like making it go open circuit or much higher resistance at
least) so that your product stops working even if the ESD didn't damage any
of the ICs inside.
--=20
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