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C6747 POH vs. MTBF?

Bernie Thompson TI
Mastermind 41665 points

I am trying to get a better feel for the power on hours (POH) figures from the C6747 datasheet and how they are meant to be used in a design, as well as how they compare to the MTBF value specified in the product folder for the same device.

In the datasheet it is specified under most conditions that the POH for the device is expected to be 100,000 hours, however the MTBF from the product folder shows 198,000,000 hours, so I am trying to reconcile the difference between these two values, is there TI documentation anywhere on how these figures are calculated and how one would use them?

For the POH value, does the limit specified in the datasheet imply that a certain % will likely have failed by this point in time, or that the probability of failure will increase after this point? I am looking for the math and modeling behind the figures to determine how this would impact an application that needs to have the device powered on in excess of a decade, such that the operating frequency or temperature can be adjusted to ensure suitable reliability for a long operational lifetime.

  • 0
    TI__Genius 14405 points

    The POH figures in the datasheet are values generated based on typical expected 'use case' models.  These POH values are determined based on the technology data and the actual design closure values.  The POH numbers found in the datasheet are specific to a design and modeled 'use conditions'.

     

    The FIT/MTBF data found in the product folder are numbers calculated based on HTOL data collected for the process technology.  These are reliability calculations do not take into account the expected 'use conditions' or the specific design closure values.

     

    In summary, when looking at a specific design lifetime under a defined 'use condition', the most accurate assess of product performance would be the POH values.  The FIT/MTBF numbers from the product folder are a more general reliability assessment based on the process technology.