replacement for CA3140 Op-Amp

Discussion in 'The Projects Forum' started by EDDY, Mar 19, 2008.

  1. EDDY

    Thread Starter New Member

    Mar 19, 2008
    1
    0
    I am working on a project which requires a CA3140 Op-Amp but I can't get one from my area so could you please suggest any other types of Op-Amp which can convieniently be used in place of the CA3140 Op-Amp. Thank you
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    If the project needs the strobe pin to control the output, then you may be out of luck.

    Otherwise, just about any FET input op amp will do as a sub. An OP07GP, for instance. You might indicate what characteristic of a 25 year old op amp is significant for a better suggestion. If you know what that is, you can go to sites and search by parameters.

    Jameco and Mouser still have CA3140's in their catalogs.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    In addition to beenthere's suggestion, Mouser's search engine will help you to find op amps that have properties that are similar.

    Linear Technology's website is also quite helpful in that regards.

    Analog Devices has an online circuit simulation program to help you choose a suitable op amp.
     
  4. hgmjr

    Moderator

    Jan 28, 2005
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  5. mrmeval

    Distinguished Member

    Jun 30, 2006
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  6. beenthere

    Retired Moderator

    Apr 20, 2004
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    With the exception that the input impedance is 10^10th, vice 200K. And pin 8 is an output strobe. Hard to come up with a sub without knowing what the 3140 was doing.
     
  7. Søren

    Senior Member

    Sep 2, 2006
    472
    28
    Hi,

    NTE7144 is a direct replacement.
     
  8. rwmoekoe

    Active Member

    Mar 1, 2007
    172
    0
    hi folks.

    ca3140 is best known for its rail to rail capability. both for the inputs and outputs. its mosfet (not j-fet) input and output stage is a characteristic too.

    so we have to find an opamp with rail to rail input common mode range, and
    mosfet output to be able to drive output rail to rail too.
     
  9. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The CA3140 is an old Cmos opamp. A 741 ordinary old opamp is completely different.
     
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