[sdiy] Zener diode wattage tolerances

Bob K farfisa5 at gmail.com
Mon Jul 9 19:20:38 CEST 2012


Great.  Thanks everyone for the advice so far.

I'll upload the schematic when I get home this evening.

On Mon, Jul 9, 2012 at 10:03 AM, John Speth <jspeth at avnera.com> wrote:
>> The documentation tells that it's a zener diode (8.2V, 2W, 10%).
>>
>> Looking online, I'm finding 8.2V zener diodes but only with a 1.3W and
> lower
>> or higher than 3W.  Nothing in the 2W range.
>>
>> I'm guessing a 1.3W diode should the job, right?
>
> Without a schematic, we'd all be guessing too.  Please post the
> schematic and maybe we can analyze it.  It should be simple enough.  Try
> to compute the max reverse current at the zener voltage and compute
> power (P=VI, you know V).  Add some reasonable headroom and you should
> be good.
>
> Remember it burned out for a reason (probably one you don't know).
> Maybe the diode was underspecced and therefore it burned out.  It might
> be worth the trouble to find a higher power diode and not take a chance
> on a lower power one.  There's no performance downside to using a 3W
> diode instead.
>
> JJS
>
>
>
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