hank k8dd wrote:
The main reason I was wondering is because on one of
my K2/100's you can definitely tell that the KPA-100
has been run very hot by looking at the solder pads.
Are you talking about some sort of oxidation effect. If the solder has
actually softened, you have exceeded the absolute maximum storage
temperature outside the device by some 33 degrees C and must have
exceeded the absolute maximum storage temperature inside the device by
even more. As pointed out elsewhere, nowadays commercial specification
devices are rated for an absolute maximum internal temperature, when
operating, that is 25 degrees lower that that. (Tin lead solder softens
at 183 degrees, absolute maximum storage temperature is 150 degrees and
absolute maximum operating junction temperature is 125 degrees.
Alternatively, you had a bad solder joint and the joint has heated up
locally.
--
David Woolley
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work.
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