On 1/10/2010 6:23 PM, DoN. Nichols wrote:

How many here have ever heard of a "binistor"? A 4-pin bistable
device which apparently never took off in the market. It was a
four-layer device (like a SCR -- except that it had another pin to allow
turning it off.

IIRC, Transitron gave it the designation 3N21. I could look it
up in the old Transitron data book -- but I don't know where that is at
the moment. :-)


I knew them as SCSs (silicon controlled switch).

Kevin Gallimore