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LM385-1.2-N: LM385Z-1.2/NOPB Temperature Characteristics from 0C to -40C

Tim Decker
Prodigy 70 points

Part Number: LM385-1.2-N

Hi There,

I have a design that utilizes the LM385Z-1.2/NOPB Voltage reference IC.  I know that the temperature specification for this part is 0-70C in the data sheet.  I want to know how this component will operate at temperatures below 0C down to -40C?  I do not care about its accuracy but I do care if it were to stop operating or break.  Can you please let me know what I should expect?

I have already posted this question to Maynard Yago in Tech Support.  He referred me to you after stating, "Operating below the absolute temperature rating will not damage the IC however this will affect the functionality of internal circuits."  

I would like to know what else I may need to be concerned with?

 Thank You!

  • 0
    TI__Genius 14631 points

    Hello Tim,

    My response would be the same. You are operating the device outside of its spec range. You may want to consider a device designed for a wider operating range such as the TL431LI.

    TL431LI data sheet, product information and support | TI.com

    Hope this helps.

  • 0
    Prodigy 70 points

    Hello Masoud,

    Thank you for your reply.  

    I only ask this because we are only able to use the LM385Z-1.2/NOPB at this time.  I need to know that if the part is operated at lower temperatures down to -40C would it result in loss of accuracy and current draw outside of those numbers specified in the data sheet or will the part become physically damaged?

    The reason is because the application can handle inaccuracy and current draw changes.  These changes will be minor affects.  Physical damage however is my only concern.

    You agreed already with your college that the LM385Z-1.2/NOPB will not be physically damaged operating at -40C.  So, it sounds like we should be ok but I guess I'm looking for any further assurance that operating this component to that level will not cause life expectancy to shorten. 

    In short, if you know the part will not be physically damaged it may not be unreasonable to think you may have some data on the characteristic affects of this part at -40C exceeding stated specifications?  Any insight you have even if details cant be shared would be greatly appreciated.

    Thank you again!

  • 0 in reply to Tim Decker
    TI__Genius 14631 points

    Hello Tim,

    In that I recommend going with  a variant with correct temp range for the application. I do not recommend operating conditions beyond our published datasheet.