Zener Diodes

tom66

Joined May 9, 2009
2,595
If you're trying to get exactly 5V zener voltage, forget it. Zener voltage varies with current, and provided you are using a simple zener and resistor circuit, the output voltage will vary with input voltage. Also, most zeners are only available in +/-5% tolerances; a few are in +/-1%.

4.7V and 5.1V zeners are the closest standard +/-5% values.
 

bertus

Joined Apr 5, 2008
20,109
Hello,

If you want a voltage as close as possible to the 5 Volts, you could also use a TL431, adjustable zener.
With a couple of presision resistors you can make the TL431 to give 5 Volts.

Bertus
 

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