[sdiy] Zener diode wattage tolerances
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
>> 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.
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