[sdiy] Does Source = Drain???

[ASSI]

On Sunday 13 June 2010, David G. Dixon wrote:
> 2N5485 is an RF JFET, and it is symmetrical.  Were you implying
> that RF JFETs are or are not symmetrical?  It's hard to tell from
> your message.

There are symmetrical ones and non-symmetrical ones, depending on what 
they were designed for.  If you want to be sure which is which, look 
for the gate-to source and gate-to drain capacitances, as that is a 
pretty good indicator.  There aren't many ways to keep those two the 
same and not get a symmetrical JFET.  In any case it would be more 
notable for a general purpose silicon JFET to be asymmetrical, so if 
there is no explicit mention of that in the datasheet, I'd not be too 
concerned.


Achim.
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