Zener Diode part numbers

QSilver

Super Member
I've been looking through some schematics and came across something that confused me.

In some voltage regulator circuits the zener diode is marked as a MZ-320 which I looked up and turns out to be a 20V Zener diode.

The circuit in question is a 31V regulator. On the parts list it says the diode can be either a MZ-320 or a WZ-320. The WZ is a 33V Zener and makes sense but the MZ is 20...

Did the MZ-320 specs change or is this a typo? :scratch2:
 
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