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ISO7740: and ISOW7841DWE MTBF data

Part Number: ISO7740
Other Parts Discussed in Thread: ISOW7841

MTBF data are not available on TI.com

Would it be possible to get MTBF @ 25degC with 5degC temp increase inside package for ISOW7841DWE and ISO7740DW ?

regards,

Paul

  • Hi Paul,

    FIT data for these devices from 55dC user temperature, 125dC qualification temperature, and 0.7eV is as follows:
    - ISO77xx: FIT = 0.5, MTBF = 2.02E+9
    - ISOW7841: FIT = 0.4, MTBF = 2.48E+9

    An entire curve can be predicted using the link here (example below is for ISO77xx). The application temperature bar can be moved down to 25dC and adjusted as desired to obtain the data you're looking for.

    I will follow up with the DPPM number to use for ISOW7841.


    Thank you for posting to the E2E forums,
    Manuel Chavez

  • Paul,

    You may use ~32 to populate the DPPM box when predicting FIT data for the ISOW7841. A reminder: this tool provides estimations only.


    Hopefully this is helpful! Let me know if you would like additional information.


    Respectfully,
    Manuel Chavez
  • Hi Manuel,

    i have new question from my customer regards to the FIT calculation:
    Where does activation energy of “0.7eV” come from?
    all FIT numbers are calculated assuming 0.7eV, it is same value used by other vendors (not only TI).

    best regards,
    Paul Antunes

  • Hi Paul,

    Manuel is currently OOO, I will help you answer your question while Manuel is away from office.

    0.7eV activation energy refers to the minimum amount of energy required to trigger a temperature-accelerated failure mechanism. I can't speak for other vendors but this seems like the value used by many semiconductor vendors. Thanks.


    Regards,
    Koteshwar Rao
  • Hi rao,

    thank you for your support.

    customer question is not on definition but more about the value: why 0.7 is used as reference ? is it based on TI experience ? customer would know the origin of this value.

    regards,

    Paul 

  • Hi Paul,

    Most failure mechanisms have an activation energy between 0.2 - 1.0eV; please let our customer know that 0.7eV is a conservative factor commonly used in the semiconductor industry.


    Thank you,
    Manuel Chavez