[sdiy] Opamp compatibility questions

[Bob Weigel]

CA3140E  is .68 at mouser.  They are a bi-mos input amp and have I think 
the standard dual pin config if I recall right...and I'm sure there are 
some other amps that would work there but probably not as cheap!  The 
"N" suffix I thought was just a packaging thing used by some.  "A" is 
the grade of chip usually.  "N" usually appears on dip plastic chips.  
Possibly one mfg. just didn't see it's relevance since maybe that's the 
only package they made it in?  I can't recall the 348's pinout at the 
moment...but probably in most apps it can be substituted.  I haven't 
compared specs on those though.  I have lots of both chip and thus never 
think about it.
  324 and 1458 are very standard pinouts for quad and dual.  It's more a 
question of what does NOT have the same pinout :-).  In quads there are 
a few configs and there are some duals in larger packages with comp pins 
and so on.  LM319 is it comes to mind?  Have a bunch of those.  Also 
some old chips like the XR...oh what is it...anyway there are some odd 
ones that don't follow that pinout.
    1458 is a dual 741 ish type amp, 4558 an enhancement, 4560 a 
japanese near equiv..4562, 4570, 4580...just about all those JRC parts 
have the same pinout and are just different alterations on the design in 
one way or another I think.  -Bob -Bob

Mikael Mørup wrote:

>Hello list
>
>I have a few questions about some "older" opamps and
>possible pin compatible substitutes, prefereably in the
>TL0xx series, as i am stocking them already, but anything
>modern will do.
>
>1) What is the difference between NE5534A and Ne5534AN ? and
>is there a reason that a circuit should use one of each for
>what looks like very similar pre. amp. tasks ?
>
>Any pin compat. subs for these ?
>
>
>2) Any pin compat. subs for Ca3140E ?
>
>
>3) Am i correct in assuming that TL084 can substitute LM348
>?
>
>4) Any pin compat. subs for LM324 ?
>
>5) Any pin compat. subs for LM1458 ?
>
>
>I can probably get these older opAmps, but i would really
>like to standardize around, and stock as few different as
>possible.
>
>Thanks in advance for your advice.
>
>Mikael
>
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