18 Feb
2010
18 Feb
'10
7:43 p.m.
On Sun, 14 Feb 2010 15:27:34 -0500
Dave McGuire <mcguire at neurotica.com> wrote:
X7R is an EIA-198 specification that defines electrical and
thermal behaviors of ceramic capacitors, not a type of dielectric
material. For sure. I know. The point is: X7R specifies _ceramic_ dielectric where
the OP talked about _electrolyte_.
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
It's not an urban legend, unfortunately:
http://www.neurotica.com/misc/chinese_capacitor.jpg
I didn't take that picture, but I've seen it with my own eyes.
I know
that picture. I should print it out and hang it on the wall at
work. Well be much fun. :-)
But that chinese capacitor is somthing different then caps with
electrolyte that make them fail.
Other crap that happened was the fun of 2003 when
capacitor
manufacturers starting making electrolytic capacitors using stolen
electrolyte formula that was incomplete.
I thought the industrial espionage story
was an urban legend.
There was one chemical manufacturer pinpointed,
that was supplying XR7 or whatever electrolyte to all the
manufacturers.
X7R is a ceramic dielectric. It has nothing to do with electrolyte
capacitors. Even cheap X7R capacitors are far more reliable then
electrolyte capacitors.