[Boatanchors] 1N3033B substitute?

[D C *Mac* Macdonald]

Check here for specs of the 1N3033B (and other) Zeners.
 
(http://www.datasheetcatalog.com/datasheets_pdf/1/N/3/0/1N3033B.shtml)

I looked for data sheet for 1N473* and found that is a
4.3V - 5.4V zener.  That is hardly a replacement.
 
If your Zener is supposed to give you 36V and only is
giving you 26, you obviously have a problem.  What is
the unregulated voltage being applied to the dropping
resistor feeding the Zener?
 
73 - Mac, K2GKK/5
Oklahoma City, OK



* In my many years, I have come to the conclusion that one useless *
* man is a shame, two is a law firm and three or more is Congress. *

* -- John Adams (1735- 1826) *










----------------------------------------
> From: w2hx at w2hx.com
> To: boatanchors at mailman.qth.net
> Date: Wed, 15 Apr 2009 23:25:56 -0400
> Subject: [Boatanchors] 1N3033B substitute?
>
> I have found what appears to be an out of spec zener diode in my bias
> circuit. I am hoping this is my problem!
>
> The zener should be 36V but this one is reading 26V. Part number is 1N3033B
> but it looks like an obsolete part. I looked through mouser and found 1N473A
> that looks promising, but before I buy, install and fry something - anyone
> have an opinion?
>
> Comparing the datasheets the differences are:
>
> Test current (Iz)
> original=7.5mA,
> replacement=7mA
>
> Max Reverse Leakage Current (Ir)
> original= 10 uA @ 27.4V
> replacement 5 uA @ 27.4V
>
> I can't quite tell if the replacement is more "stout" than the original or
> less stout?
>
> I don't know if that extra .5mA of test current is important or if 5uA is a
> "better spec" or under-rated comared to 10uA?
>
> Is there a better or "official" substitute?
>
> As always, very much appreciated!
>
> Eugene w2hx
>
>
>
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