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Original question:

UCC21222: UCC21222QDQ1 IC technology

UCC21222: UCC21222 Tj value

Suresh R
Intellectual 260 points
Part Number: UCC21222

Hi,

Please clarify below query.

Refering to below test report, please let me know how the Tj is maintained at 55degC during the testing. Its the theoretical value calculated or, its monitored using a specific tool.

https://www.ti.com/quality/docs/estimator.tsp?OPN=UCC21222QDQ1&CPN=&partNumber=ucc21222#resultstable

Thanks & Regards,

Suresh.

  • 0
    TI__Guru**** 189399 points

    Hi, Suresh,

    That is a calculated value, it would be very difficult to actually measure the junction temperature during the qualification testing.

    If this answered your question, please press the Green button, otherwise let us know what other questions you have.

  • 0 in reply to Don Dapkus
    Intellectual 260 points

    Hi,

    Okay. Is there any boundary conditions for this FIT value for different components.

    For eg., say for IC's, gate drivers it should not be greater than 1.

    For Mosfets, it should not be greater than 0.5 etc., Is there any industry standard which gives the limit for this FIT values for different components? 

    This would help me prevent in selecting the higher FIT rate components in my design.

    Your comments on this please.

    Thanks & Regards,

    Suresh.

  • 0 in reply to Suresh R
    TI__Guru**** 189399 points

    Hi, Suresh,

    That's an interesting question. I have never seen anything published that talks about this.

  • 0 in reply to Don Dapkus
    Intellectual 260 points

    Hi,

    Thanks for patiently answering my questions.

    Don Dapkus said:

    Hi, Suresh,

    That is a calculated value, it would be very difficult to actually measure the junction temperature during the qualification testing.

    If this answered your question, please press the Green button, otherwise let us know what other questions you have.

    Can you tell at what ambient this Tj value is calculated?

    Thanks & Regards,

    Suresh.

  • 0 in reply to Suresh R
    TI__Guru**** 189399 points

    Hi, Suresh,

    You bet! I know calculating reliability can be difficult, and we are happy to help you!

    The ambient temperature is determined by the power dissipation of the IC. So, if the target junction temperature is 55C, we adjust the ambient temperature to allow the power dissipation to increase the junction temperature to 55C.

    Let us know if you have further questions.