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I need OP-AMPS Answered

I am having a hard time obtaining old op-amps (max420cpa, ltc1150, etc). Maxim/Newark/(ebay -only seldom) no longer carry them. Where can I get them at a  REASONABLE  price? Thank You. Ed.

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steveastroukBest Answer (author)2010-05-10

Are you looking specifically for chopper stabilised amps then Ed ?

They ARE rare beasties these days - Maxim for one doesn't do ANY anymore.

Looking at modern amps, you barely need to use chopper mode anymore.

Steve

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edwianni1 (author)steveastrouk2010-05-10

Right now I'm looking for two max420cpa specifically.

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apfergus (author)2010-05-10

Is there any reason you can't use any of the 741 type op amps? For example the LM741 from National Semiconductor is usually readily available and incredibly cheap. 

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seandogue (author)apfergus2010-05-10

fwiw, 741s are only suitable for the most primitive of circuits.

There are far better general purpose amps available these days.

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steveastrouk (author)apfergus2010-05-10

Yes, they're not chopper stabilised....

Steve

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edwianni1 (author)2010-05-10

I am trying to repair an old seismic preamp (a circuit- designed by Andy Loomis - on the infiltec site). It uses a max420cpa and the recommended replacement for it has a different pin configuration.

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steveastrouk (author)edwianni12010-05-10

I used to use the 420, I MIGHT still have some stock. If all else fails Ed, make a transition board up.

Steve

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kelseymh (author)2010-05-10

According to DigiKey, the "max420cpa" is an obsolete item (presumably no longer manufactured); you need to call them for pricing.  They do have a variety of LTC-1150 submodels available.  Check the list for the particular item you have in mind.  Good luck!

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steveastrouk (author)kelseymh2010-05-10

Look a little closer, and they are all "non-stock" with MOQs between 2500 and 900 pieces !!!

Steve

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kelseymh (author)steveastrouk2010-05-10

Yep.  All but two of them, this one (with 22 in stock) and it's surface-mount sibling.

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