linear IC suffixes

[CGS2510.SEP.STUDENT.UCA at CUB.UCA.EDU]

> Several of the circuits I'm looking at call for linear IC's, however the
> parts list usually only calls for a 'TL071', 'TL082', 'TL084', etc.,
> with no suffix.  Consulting my Mouser catalog, I find that there are at
> least three different types of each of these (not counting the surface
> mount types) with suffixes like 'ACN', 'CN', and 'IN'.  What do these
> suffixes mean?  I would readily spend $1.10 for an 'ACN' type if I
> thought it performed better than a .60 'CN' type.

C is commercial, I is industrial, etc.  Some are company lettering...
The difference usually is the temperature rating and for op amps the 
dc offset and stuff like that.  I am of the opinion since I don't 
live in Antarctica or anything  and usually am not worried about a 
small DC bias to just go with the CN suffix.  Generally, anyway. 

> Also, now that I have looked in a few different places, I'm beggining to
> think that the  'LM1448' is hard to find.  Anyone know offhand where to
> get one, or is there a good substitution for this?

That may be a missprint perhaps since the 1458 is a very common op 
amp and really stinks compared to more modern op amps (its a dual 
741).  If it is an op amp, it is very conceivable that it was used 
where the convenience of an op amp was desired, but the prices back 
then were prohibative for using fancy stuff in all but the signal 
path.  Many things use 1458's and such for CV controls and the like.
In ALMOST EVERY case, a direct replacement with a TL072 or whatever 
should work.  Look at the schematic and see if there is anything 
going on that prohibits the use of another variety op amp (current 
drive and that kind of thing) and pick a different one if you feel so 
inclined.