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'[EE]: Op-amp replacement'
2001\02\01@062020 by Michael Rigby-Jones

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I'm having a hard time trying to find a suitable replacement for an obsolete
Motorola op-amp.  The MC33182D appears to defy the normal laws of "fast, low
bias current, low power : pick one"!

It's specs do seem excellent:
4 MHz BW,
10v/us slew rate
+- 1.5 to +-18v operation
210uA supply current per amp
Input offset current 0.001 nA
Input bias current 0.003 nA

I need a dual amp in an SO8 package that will operate on +-5 volts, and I
can tolerate maybe up to 2 ma supply current and I could manage with
slightly less BW (say >=2MHz), but I definately need low bias/offset
currents.  I have had a thorough search of Nat-Semi and Maxim and I've found
nothing that even remotely matches my needs.

Alternatively if anyone could suggest a possible source of the Motorola amp
that would be even better.

Regards

Mike

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2001\02\01@111120 by Dan Michaels

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At 11:18 AM 2/1/01 -0000, you wrote:
>I'm having a hard time trying to find a suitable replacement for an obsolete
>Motorola op-amp.  The MC33182D appears to defy the normal laws of "fast, low
>bias current, low power : pick one"!
>
>It's specs do seem excellent:
>4 MHz BW,
>10v/us slew rate
>+- 1.5 to +-18v operation
>210uA supply current per amp
>Input offset current 0.001 nA
>Input bias current 0.003 nA
>

Mike, you might take a look at some of the new offerings
from TI --> TLV, TLE, and TLC series opamps. However, I
am not sure you can get that kind of GBW in a device that
draws only .2mA.

- danM

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2001\02\02@133606 by Chris Eddy

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Michael;

I understand how you could run into trouble with National... They are great for
general purpose, but run out of steam on specialty (with the exception of the
Comlinear stuff).  Just try to cross an OP177 to National.

I did a parametric search on Analog Devices web site, and was met with so many
good candidates that it did not bear writing a dissertation here for the list.
I just suggest you go to AD's web site and have at it.  It is much easier to get
a high performance opamp cross with them than National.

Chris Eddy~

Michael Rigby-Jones wrote:

{Quote hidden}

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2001\02\12@015121 by Russell McMahon

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> I'm having a hard time trying to find a suitable replacement for an
obsolete
> Motorola op-amp.  The MC33182D appears to defy the normal laws of "fast,
low
{Quote hidden}

found
> nothing that even remotely matches my needs.

With a little help from ON semiconductors ......
The TI TL062 and family (61, 62, 64) seems a reasonably close match.
Down to +/- 2 volt supply.
200uA per amplifier supply current.
3.5 V/uS slew
Offset 0.005 nA typical
Bias 0.03 nA typical
Gain bandwidth of 1 MHz is possibly only low spec.
(What does TL08x do ?)
This device seems to satisfy all 4 requirements :-)

Fast / Low Power / OK bias& offset / Available

Not QUITE the performance you desire min every area but perhaps close
enough.


       Russell McMahon

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2001\02\12@201307 by Jane Ifurung

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yes, ti has a wide range of op-amps (even up to 270
MHz).

--- Russell McMahon <spam_OUTapptechTakeThisOuTspamCLEAR.NET.NZ> wrote:
{Quote hidden}

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