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LM4040: Order code guide?

Olli Mannisto
Expert 1750 points
Part Number: LM4040

Perhaps I'm being dense but I can't find the order code guide for this part. There are great many variants but the only part number reference is for the package markings! I can deduce from Digi-Key search some details but the logic seems fuzzy. For example:

LM4040CIM3-2.0/NOPB = 0.5% 2.048v 85C 65µA SOT23 reference

LM4040C20IDBZR, LM4040C20IDBZT, LM4040C20QDBZT  = 0.5% 2.048 85C 80µA SOT23 reference

Datasheet for CIM3 refers to the part as LM4040-N and does not contain codes for C20 parts. Datasheet for C20 parts refers to the part as LM4040A through LM4040D and does not contain order codes for CIM3 part..

So what gives here? Should I be looking at CIM3 or LM4040C20? Last letter denotes large vs small reel but other than that it's not obvious.. What's the difference between LM4040-N and the other variant except for minor leakage current?

What's the correct Spice model for LM4040CIM3-2.0?

  • 0
    TI__Guru 56345 points

    Hi Olli,

    The LM4040A through LM4040D is a different part number than the LM4040-N devices.  For the CIM3 device, you will find it in the LM4040-N datasheet.  The "C" is for tolerance grades for the initial reverse breakdown voltage. The "I" is meant for industrial temperature range.

    Page 43 in the LM4040-N datasheet may help you in deciding which LM4040-N device to order.

    Here is a website from ti.com store.

    https://www.ti.com/store/ti/en/p/product/?p=LM4040CIM3-2.0/NOPB

    For the spice model, I believe this model is the one for LM404CIM3-2.0:

    https://www.ti.com/lit/zip/snom417

    Ben

  • 0 in reply to Ben C
    Expert 1750 points

    Page 43 is for package markings, I can see the actual order code guide has a column for these codes. Fairly obscure I got to say, usually you find the order code breakdown instead. 

    I don't think LTSpice will do encrypted models but that same partname (LM4040_NC2P048) is available without encryption too.

  • +1 in reply to Olli Mannisto
    TI__Guru 56345 points

    The LM4040-N datasheet is on the list to be updated with a nomenclature picture to better help define the ordering code.  We apologize for the inconvenience that it may have caused you.

    If there are no other questions, please click on "resolved" to close the thread.  Good luck to you!

    Ben

  • 0 in reply to Ben C
    Expert 1750 points

    I'm still not quite clear what's the difference on the two reference families. Is there a reason to prefer one over the other? 

    LTspice apparently *does* support encrypted models, is the encrypted model somehow better than the unecrypted one?

  • 0 in reply to Olli Mannisto
    TI__Guru 56345 points

    Hi Olli,

    Here is what I found between the LM4040-N and the LM4040:

    "Texas Instruments and National Semiconductor pre-merger created a LM4040 device. After the merger, to differentiate the devices, we added a "-N" to specify which originated from National for customers that were originally using that device. While both do offer similar specifications, they do also offer some differences in options offered. For example we offer the LM4040-N in AEC Q100 automotive grade but we do not for the LM4040."

    "LM4040-N is the more popular one of the two and it has more accuracy options."

    There are no difference between the two models.  TI recently decided to unencrypt the models.

    Ben