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TPS568215: Questions about FIT

Kazuhiko Hirano
Genius 14278 points
Part Number: TPS568215

Hello,

My customer has some questions about TPS568215 FIT.

Q1:
ti.com says TPS568215 FIT is 0.1 at 55oC usage temp.
Here, which is the usage temp, ta or tj?

Q2:
When estimating FIT at other usage temp using derating tools, should the same Activation energy 0.7eV be used?
Or if Activation energy should also be changed, how to do that?

Best regards,

K.Hirano

  • 0
    TI__Expert 7320 points

    Hi Hirano,

    I will check the question with our Quality team and reply you tomorrow.

  • 0 in reply to Athos Zhao
    TI__Genius 14278 points

    Athos,

    Thank you for taking care of my customer's questions.
    I look forward to receiving your reply tomorrow.

    Best regards,

    K.Hirano

  • 0 in reply to Kazuhiko Hirano
    TI__Expert 7320 points

    Hi Hirano,

    Since our quality team have not reply me yet, please kindly wait for the results. I will reply you at the earliest.

  • +1
    TI__Expert 7320 points

    Hi Hirano,

    I get some explanation from our QR team.

    For question1, generally usage temperature refers to Tj, while it is hard to get the Tj value. The actual situation is that the temperature in ti.com can be regarded as the Ta, and we also use Ta=125C as the test temperature. When Ta reaches 55C or 125C, Tj will definitely reach certain temperature.

    For question 2, the FIT conversion between different temperature is based on the same activation energy. We can just use 0.7eV since we are not so clear about the failure mechanism. Activation Energy is generally measured through tests. Through wafer level or structure level tests, single failure mechanism can be obtained.

    While the comprehensive Activation Energy combines several different failure mechanisms which lead to the ambiguous result. Ea of different failure mechanisms are summarized in the standard JEP122, based on various different Ea values, 0.7eV is relatively conservative and reasonable.