On 06/20/11 10:44 PM, Poul-Henning Kamp wrote:
In message<[email protected]>, "Dr. David Kirkby" writes:
1) Higher temperature devices (like 105 deg C) will be more relieable than low
temperature ones like the standard 85 deg C cap. I'm sure at high temperatures,
You should check both temperature and lifetime rating of the capactors.
I have, but I would assume one rated at 6000 hours at 125 deg C would be at
least as good as one rated at 7000 hours at 105 deg C.
There are many capacitors on the market these days with 5000h or
even 2000h rated life.
That is 7 or 3 months respectively.
Even 1000 hours I've seen. But these are of course at the maximum temperature,
which few would use them at. Otherwise failure rates would be a lot higher than
they are.
I've not seen any electrolytics rated more than 10,000 hours (14 months), but
they last a lot longer if the temperature is lower.
My PC is already more than 14 months old, and has been on 24/7. Hopefully it is
not dying on me.
And yes, it should be criminal to manufacture and sell those.
Well, I think the MTBF will be a lot more than that in practical use, as few
would design equipment to run at 85 deg C, which is the lowest maximum
temperature rating I've seen on any cap.
--
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
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