[sdiy] Does Source = Drain???

David G. Dixon dixon at interchange.ubc.ca
Sun Jun 13 11:00:48 CEST 2010

Every datasheet I've ever read on JFETs always says that the source and
drain are interchangeable, right on the front page.  I don't think it
matters.  I'd say, orient them for maximum layout convenience.

> I was building the VCO core for my Steiner project and I inadvertently
> swapped the drain and source on the JFET. The circuit still worked. I
> re-read about JFETS, but didn't find a satisfactory answer. Can the Drain
> and Source be swapped in any circuit? That is, are they essentially the
> same
> electrically?
> I bought a Peak, Atlas DCA semiconductor analyzer, and it can't
> distinguish
> from the source and drain either.

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