Re: Converting a NTC voltage into temperature in Celcius

On 11/04/2025 2:49 am, Don wrote:

brian wrote:
 <snip>
 

I ended up using a diode as a temperature sensor as I
couldn't get it linear enough.

 Interesting. Thank you for sharing. When operated in Zener mode (as
opposed to avalanche mode) a Zener diode's NTC apparently remains
approximately the same, regardless of orientation (forward or reverse
biased).

Whether a reverse biased diode breaks down in Zener mode or avalanche mode depends entirely on the diode you have selected.
if it breaks down at less than 5V reverse voltage it is breaking down by the Zener mechanism (with a negative temperature coefficient) , and if it the breaks down at an 8V or a higher reverse voltage the avalanche mechanism is dominant (with a positive temperature coefficient.
https://toshiba.semicon-storage.com/us/semiconductor/knowledge/faq/diode/are-there-any-special-considerations-for-the-temperature-coeffic.html
doesn't exactly conform to your claim.
--
Bill Sloman, Sydney