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TL431: Ageing and radiation drift for worst-case analysis in aerospace

Antonio Facchin
Prodigy 80 points
Part Number: TL431
Other Parts Discussed in Thread: LM4040

Tool/software:

My colleagues and I are performing a worst-case analysis for an aerospace application which involves Texas Instrument components as:

  • TL431

We are interested to know more about temperature and/or ageing drift of specific parameters for these components.

Below it is reported a table of the components' parameters which are part of the worst-case analysis.

In the table we highlighted in green the values verified by technical documentation already available, in red the ones for which we do not have a technical validation.

Is it possible to have these information? Does someone have these information already?

Thank you in advance

 

Best Regards,

Antonio

  • 0
    TI__Expert 3900 points

    Hi Antonio, 

    Thanks for your question!

    There is no information available on the long term drift of TL431. The output voltage might change over time but its effect will be insignificant compared to the initial accuracy and other sources of error. Accelerated ageing tests had no failures where the accuracy drifted out of the datasheet specs. 

    For the TL431AQ please also see below for the tempco calculation using Section 7.1 of the datasheet:

    temp min: -40C

    temp max: +125C

    Tempco: 82.6ppm/C

    I hope this helps!

    Best Regards,

    Andrew Li

  • 0 in reply to Andrew Li
    TI__Expert 3900 points

    Hi Antonio,

    Apologies for the second response.

    The LM4040 and LM4050 devices have long-term drift information on their datasheets. Please see the links below for their product folders:

    https://www.ti.com/product/LM4040

    https://www.ti.com/product/LM4050-N

    I hope this helps!

    Best Regards,

    Andrew Li