Quoted from nerdygrrl:It looks like the 723CN that GPE has is an adjustable VR, I think that may be different than the 723PC. Dropped him a line to see.
Guys -- Same part, different manufacturer.
For this part, "P" and "N" in the manufacturer's suffix means 'Plastic DIP' type package.
The "C" in the suffix means 'commercial' temperature range of 0 to 70C.