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TPS65381A-Q1: Safety in ASIL-D and SIL3 Applications: any runtime limit indication?

Vincent LORENTZ
Intellectual 320 points
Part Number: TPS65381A-Q1

Dear TI Support Team,

I was not able to find any safety information in the datasheet or in the safety manual related to the considered "trip time" (i.e., the maximum time of operation without performing a power down). Are these information only considered in the FMEDA Microsoft EXCEL tables provided with the safety package under NDA? Are there any known restrictions using the TPS65381A-Q1 in 24/7 applications at safety levels of ASIL-D or SIL3?

Best regards

Vincent

  • 0
    TI__Expert 8730 points
    Hi Vincent,

    In general, your question is not related to safety, but it is mostly related to mission profile. This device is qualified for AEC-Q100 and number of guaranteed operating hours are according to AEC-Q100 qualification and this number is provided in our qualification report. Based on your mission profile, you can estimate whether this device meets AEC-Q100 qualification standards.

    I have forwarded your request to this device expert and he will get back to you if my statements are not correct for this device.

    Regards,

    Murthy
  • 0 in reply to Krishnamurthy Hegde
    TI__Mastermind 20590 points

    Hi Vincent,

    Murthy is correct, the question is more reliability than specific to functional safety.  As Murthy mentioned, the device is AEC-Q100 qualified to Grade 1 (Ta of -40C to +125C, Tj of -40C to +150C).  That qual is run at specific operating conditions to qualify reliability to that specific operating point for the required number of hours.  Typically industrial 24/7 applications run much cooler with a completely different mission profile (thermal profile).  In the FMEDA, you can tailor the mission profile to match your application and you can see the impact to the modeled FIT of the device (IEC 62380 or SN 29500 models).  This is direct way to seem the modeled impact and an implied impact of mission profile to long term reliability. TI is not aware of any reasons this device cannot be used in 24/7 applications and is in production for many 24/7 industrial applications. 

    If additional support is needed to extract the coverage of the AEC-Q100 qualification to specific use case or mission profile, if you provide the mission profile of your application (hours at temperature) we can ask our reliability experts to comment from the actual TI silicon and qual data perspective rather than relying on a communized model such as IEC 62380 or SN 29500.