Post by thread:voltage regulator for -40deg C

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

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.