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LM70840: LM708x0 (and LM708x0-Q1) variant differences?

Felix Deichmann
Prodigy 150 points
Part Number: LM70840
Other Parts Discussed in Thread: LM70880, , LM70860

Tool/software:

Hello,

could you please elaborate on the differences of LM708x0 variants (LM70840 vs. LM70860 vs. LM70880).
We could use the LM70840 for our application, but using the higher spec variants as alternatives for sourcing/availability/common designs would be great.

Apart from the rated (?) output current range I_OUT and the specified/corresponding sense resistor R_S values, I cannot spot major differences in the common datasheet.
Is the difference purely in device testing/selection, with the variants sharing the same silicon maybe?
Could this also apply to the AEC-Q100 (Q1) automotive variants of LM708x0-Q1 then?

Thanks!

  • +1
    TI__Guru 56345 points

    Hi Felix,

    Felix Deichmann said:
    could you please elaborate on the differences of LM708x0 variants (LM70840 vs. LM70860 vs. LM70880).
    We could use the LM70840 for our application, but using the higher spec variants as alternatives for sourcing/availability/common designs would be great.

    The LM708X0 variants have the same pinout and footprint so sourcing/availability/common designs is definitely possible with these family of parts.

    Felix Deichmann said:
    Apart from the rated (?) output current range I_OUT and the specified/corresponding sense resistor R_S values, I cannot spot major differences in the common datasheet.
    Is the difference purely in device testing/selection, with the variants sharing the same silicon maybe?

    I do not have the silicon information so I cannot give you a definitive answer on whether or not the silicon is the same. My guess is that the size of the FETs are sized according to the current rating of the device. 

    Felix Deichmann said:
    Could this also apply to the AEC-Q100 (Q1) automotive variants of LM708x0-Q1 then?

    According to TI.com, the explanation above describes the difference between automotive and non-automotive products that TI offers.

    Ben

  • 0 in reply to Ben C
    TI__Guru 56345 points

    Hi Felix,

    If there are no further questions, please close the thread by clicking on "resolved". Thank you and good luck to you!

    Ben

  • 0 in reply to Ben C
    TI__Guru 56345 points

    Hi Felix,

    Just reaching out to you again. Please let me know if there are any other questions. If not, please close the thread by clicking on "resolved". Thanks!

    Ben

  • 0 in reply to Ben C
    Prodigy 150 points

    Thanks, I waited a bit for possible additional info on identical (or not) silicon of the variants. I will accept your guess of different "FET sizing". Wink We can probably evaluate and certify/test the largest (LM70880) and smallest (LM70840) variant then.

  • 0 in reply to Felix Deichmann
    TI__Guru 56345 points

    Hi Felix,

    If there are any other questions regarding the LM70XX0/-Q1, feel free to start a new thread. Best wishes and good luck to you.

    Ben