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PICList Thread
'voltage regulator for -40deg C'
1999\04\02@042259 by Stuart Meier

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Having selected Industrial spec PICs for a high altitude avionics project,
I'm now trying to source a reasonably priced -40deg 78L05 or equivalent
regulator. But so far without success.

Will the 0-85 deg spec ones operate satisfactorily at low temps, or should I
use a zener setup?

Many thanks for any suggestions

Stuart Meier

1999\04\02@175455 by paulb

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Stuart Meier wrote:

> I'm now trying to source a reasonably priced -40deg 78L05 or
> equivalent regulator.  But so far without success.

> Will the 0-85 deg spec ones operate satisfactorily at low temps, or
> should I use a zener setup?

 What makes you think you'll find a -40¡ rated Zener when you can't
find such a regulator?


 I *suspect* the ordinary ones might do (after all, if there are
ordinary and low temp parts, they're generally all from the same
manufacture, just tested and *characterised* for the extended range).

 IOW, the specs may not be guaranteed, but it'll probably work close
enough.  (Disclaimer:  Not a chip expert!)
--
 Cheers,
       Paul B.

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