Op Amp Substitute

Discussion in 'The Projects Forum' started by dickcruz, Jan 9, 2007.

  1. dickcruz

    Thread Starter Member

    Jan 7, 2007
    20
    0
    I need a substitute for the LMH6642 opamp
     
  2. dickcruz

    Thread Starter Member

    Jan 7, 2007
    20
    0
    the substitute should be compatible with this circuit
     
  3. Distort10n

    Active Member

    Dec 25, 2006
    429
    1
    What is wrong with the LMH6642? Asking for a substitute for a circuit is too broad of a question. What is the application of the circuit in your design.
    Voltage Feedback?
    Current Feedback?
    High Slew Rate?
    Low input bias?

    What are your critical parameters?
     
  4. dickcruz

    Thread Starter Member

    Jan 7, 2007
    20
    0
    voltage feedback.
    I am unable to get the part where i live.
    I need something with the same charecteristcs
     
  5. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    What is your application? If we knew something about that, we might be able to suggest alternatives.
     
  6. Distort10n

    Active Member

    Dec 25, 2006
    429
    1
    There are plenty of manufacturers that have parametric searches. Since this is a photodiode application look for the following:

    High input impedance
    Low input bias current

    These two parameters go hand and hand. Low input bias current in the range of pA screams FET input. OPA129 has input bias currents on the order of fA.
     
  7. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Would an ADA4851 work?
     
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