[sdiy] Older, more complete, uA726 datasheet?

Tim Stinchcombe tim102 at timstinchcombe.co.uk
Fri Dec 2 23:49:05 CET 2022

Hi list,
I have been looking at the Fairchild uA726 datasheet that is widely
available on the net, and it struck me that there isn't really much info on
it about how to select the value of the resistor to use on pin 6 to set the
temperature. Looking at the archives it is clear that this has been noticed
before, but then I came across this message which indicates that there *is*
likely an older datasheet with extra charts which are not to be found on the
usual one:

This reply to that post specifically mentions charts which apparently don't
correspond to any on the usual datasheet found online:
(Is Terry Michaels still around?)

I found a large collection of old Fairchild databooks here:

and searching through those only turns up the usual 'cut-down' version, the
oldest being from 1973. Frustratingly the 1969 databook, which lists the
uA726 in the contents as being in chapter *6*, only goes up to chapter 5, so
this _might_ be a candidate for containing the older data..?

Does anyone here have a really old databook with the uA726 in it which
contains the 'missing data', or an older copy of the actual datasheet, which
could be scanned and made available to the masses? (Or indeed is there one
already out there that I have missed?) After a lot of searching around this
afternoon and evening, it would be nice to 'plug' this apparent hole our
collective uA726 knowledge.

Tim Stinchcombe 

Cheltenham, Glos, UK
email: tim102 at timstinchcombe.co.uk

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