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LM393: What is the difference of supply power between LM393 and LM2903?

Eggsy Pang
Expert 4985 points
Part Number: LM393
Other Parts Discussed in Thread: LM2903,

Hi Team,

          I saw the LM393 and LM2903 is the same datasheet. May I know what  the difference of supply power between LM393 and LM2903 is?

There is my point:

LM393 can support dual supply power, +18V to -18V, while LM2903 is singal  supply power, 0V-36V. 

Is it right?

Thanks!

  • 0
    TI__Guru 60126 points

    Hello Eggsy,

    Both have an Absolute Maximum of 36V single supply, which would be +18 and -18V on a split supply.

    If they do not have a "V" suffix, then the maximum specified voltage is 30V (or ±15V split).

    If they do have a "V" suffix, then the maximum specified voltage is 32V (or ±16V split).

    Operation between 32 and 36V will not damage it, but it may exceed some datasheet specifications (offset, bias current).

    All can support "split" supply power, but beware that the output will pull down to the negative voltage (i.e -18V) when "low", and NOT common ground (0V). Level shifting would be needed for ground referenced logic inputs.

    If split supplies are used and ground referenced logic is used, then we recommend the LM319, which can be powered from split supplies, but has a ground referenced open collector output.


  • 0 in reply to Paul Grohe
    TI__Expert 4985 points

    Hi Paul,

    Thanks for your help!

    But my customer feedback that when powered by ±12V, LM393 work normally but LM2903 is broken (100%).

    When powered by 12V singel, LM393 and LM2903 all work normally.

    Do you have any suggestions?

    Thanks!

  • 0 in reply to Eggsy Pang
    TI__Guru 60126 points

    Hello Eggsy,

    What are the input signal voltage levels? Are any above 11V? What is the pull-up resistor value?

    The LM393 and LM2903 are practically the same. Are they mixing the TI and National (-N) versions?

  • 0 in reply to Paul Grohe
    TI__Mastermind 25970 points

    Eggsy

    My apologies.  I accidentally closed this but it is clearly not closed.  Paul will continue to support if you have further input on your application.

    Chuck

  • 0 in reply to Chuck Sins
    TI__Expert 4985 points

    Hi Chuck,

    What is the difference between TI and National (-N) versions?

    Thanks!

  • 0 in reply to Eggsy Pang
    TI__Guru 60126 points

    Hi Eggsy,

    They are as similar as two different designs, by two different companies on two different processes can be..

    The National "-N" version is the original, and the TI version is a second source. The designs are nearly identical.

    There will be differences in the extremes of operation, but for the majority of applications they are interchangeable.