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LM7800: Can LM7805 be used below 0C?

Joey V.
Prodigy 70 points
Part Number: LM7800

Tool/software:

Hello,

Datasheet only specifies operating conditions from 0C and above. 
Can this part be used in industrial applications below 0C? What's the approximate behavior degradation expected? 

Thanks

  • 0
    TI__Expert 4810 points

    Hi Joey,

    It won't damage the device, but it is out of recommended range, so the EC table values will no longer be guaranteed. Basically, expect lower output accuracy, higher quiescent current, and higher dropout per a number of graphs demonstrating typical behavior below the 0'C limit that can be found in the datasheet:

    If you're expecting a subzero application, we can always find you a similar part designed to work more reliably in those conditions.

    Best,

    Gregory Thompson

  • 0 in reply to Gregory Thompson
    Prodigy 70 points

    Is there any risk of the device not starting/functioning? After browsing the forum it seems like devices from this similar design era may have some startup issues in cold temp?

  • +1 in reply to Joey V.
    TI__Expert 4810 points

    Yea, startup issues at cold temperature are very common with parts of the era. A lot of parts have a very small margin below the rating before startup issues occur. It's an old chip, so unfortunately, we don't have robust data from out of spec operating temperatures specific to it. I would be concerned about it.

    Modern chips have much better performance at low temperature (we usually rate to -40'C), this really is a case where I'd recommend switching if possible. If you let us know your package and required specs, I'd be happy to find you a drop-in replacement.