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LM311: Difference between LM311, -N and -M.

Part Number: LM311
Other Parts Discussed in Thread: , LM6511, LM211

Hi team,

What is the difference between LM311, LM311-N and LM311-M?

I can't see big difference between them on the internal circuit in the DS.

I would like to use it for GND standard open-collector output.

Do you have any recommendation for this system?

Best regards,


  • The LM311 is made by TI.
    The LM311-N was originally made by National Semiconductor.

    LM311D is the orderable part number of the LM311 in the SOIC package.
    LM311M is the orderable part number of the LM311-N in the SOIC package.

    What voltage, speed, and drive strength do you need?

  • Hi Clemens,

    Thank your for providing that info for Yuto.

    Hi Yuto,

    I believe that Clemens provided answers to your questions about the distinctions you mentioned. As far as a follow-up, can you share some of the design requirements that Clemens mentioned? (Speed, Supply Level, Drive strength). This will help me identify the best part for your needs.

    Kind Regards,


    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (

  • Hi Clemens and Joe,

    Thank you for the answer\and sorry for late reply.

    Customer would like to use it for the alternatives of uPC311/Renesas.

    I thought that the LM311 is the best device for it.

    Do you have other recommendation?

    I am asking the design requirements that Clemens mentioned.

    best regards,


  • The uPC311 is a clone of the LM311(-N); both can be used as replacement.

    Other devices might have better electrical characteristics, but not are pin-to-pin compatible.

  • Agreed.

    Thanks Clemens for the continued excellent support.


    I will keep the post open for a while in case you find the customer needing different performance.


  • Hello Yuto-san,

    The LM211 is actually the closer replacement due to the temp range. Also the LM6511.

    Which package are they replacing?

    If it is the μPC311G2 "SOP" package, the Renesas SOP-8 package is slightly wider than our "D" SOIC-8 package. Make sure the customer is aware of the difference and that their layout can accommodate the difference.