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TMUX154E: MTBF / Reliability Data : Is operating temperature the same as junction temperature?

Tyler Greenstein
Prodigy 10 points
Part Number: TMUX154E

Tool/software:

Hello,

I am aware that most reliability data is presented at 55C. I need to convert this temperature because I need to find equivalent MTBF values at 100C. I know that TI has a conversion calculator (https://www.ti.com/support-quality/reliability/temperature-change-FIT.html) that uses the Arrhenius relationship. On this calculator, is the "application temperature" the same as the component's junction temperature, or is this temperature just the ambient temperature surrounding the component? In other words, is the application temperature equal to the junction temperature? And is the reference temperature TI's recommended temperature for operation? Thanks! 

  • 0
    TI__Genius 10225 points

    Hello Tyler,

    The reliability data is presented at the range of -40 to 85C, not 55C. Why do you want to find the values at 100C? Are you planning to operate the device at such temperature?   

    The Operating ambient temperature is our recommended temperature for operation, which is up to 85C. Exceeding it can cause device issues. 

    Application temperature is the ambient temperature of the device during operation.

    Thanks,

    Nir  

  • 0 in reply to Nir Gilgur
    Prodigy 10 points

    Hello Nir, 

    I am aware of this operating ambient temp. I was actually looking at the reliability sheet: Linked: www.ti.com/.../report

     

    This MTBF is derated to 55C. I need a temperature other than 55C. This is just a general question regarding all TI parts, and not just this one. Some parts are analyzed to have Tjunction = 100C, and these temperatures are below maximum Tjunction thresholds, so that is not a concern. I was wondering how Tjunction applies to the calculator, or it doesn't at all. With application temperature = ambient temperature of device during operation - is this not Tjunction, and instead the air around it during operation? 

    Thanks,

    Tyler

  • +1 in reply to Tyler Greenstein
    TI__Genius 10225 points

    Hello Tyler,

    Understood, thank you for clarifying. 

    I am not really an expert on MTBF calculation, but I did find this document online that might help.

    On page 24 it mentions junction temperature as the operating temperature. It seems like Tjunction is applied in the calculation as the low and high limits of the temperature. 

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    Prodigy 10 points

    Nir, 

    I think this answers my question. Thank you for your help. 

    Regards, 

    Tyler