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The Rohm 6.2V should be fine.

I never simulated the temp performance, that was MindSim. Generally, in what we usually call Zener Diodes, the are actually two breakdown mechanisms: Zener breakdown and avalanche breakdown. Zener breakdown dominates below about 5.1V and avalanche dominates above that voltage. Avalanche mechanism has a positive tempco and Zener has a negative tempco.

It is very common design practice to pair a 6.1V or 6.2V Zener with a silicon diode or base-emitter junction to achieve close to zero tempco.

If the Zener is above 5.1 volts some will call it an "avalanche diode" instead of Zener Diode..... Truth is, all Zener Diodes have both mechanisms going on to varying degrees, hence a nonlinear change of tempco vs voltage spec.

rogerw

[Edited Message Follows]

Roger:
?The closest mosfet in my Micro-Cap library was a 2SK311 to the 2SK3563 that I was proto-typing with.?
Since these mosfets are much higher current parts, than those you may have used in your sim,? they don't work as well in the simulation I ran using a 2SK311,?
I had to tweak R6 to 6.8M to get the circuit to work and as you simulated, temp stability is great.?
Now I have a few more things to cobble together tonight.
I looked up the part I will be using its a Rohm MTZJ-6.2? zener.
will try to make time this evening to melt some solder
P

-- 
rogerw
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