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Article #79Re: Crisis in Japan: defective electro caps round the world
From: John Larkin
Date: Mon, 09 Dec 2002 18:37
Date: Mon, 09 Dec 2002 18:37
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On Sun, 08 Dec 2002 22:14:05 -0500, Boris Mohar <borism-notrequired-@sympatico.ca> wrote: >On Sun, 08 Dec 2002 18:19:42 -0800, John Larkin ><jjlarkin@highSNIPlandTHIStechPLEASEnology.etc> wrote: > >>On Wed, 4 Dec 2002 10:36:03 -0800, DaveC <anon@bugus.net> wrote: >> >>>This story describes how several (5) electrolytic capacitor manufacturers are >>>having problems with poor quality electrolyte. IBM and other purchasers have >>>confirmed the huge impact on their business. >>> >>><http://www.niccomp.com/taiwanlowesr.htm> >> >> >>It's interesting that most of us routinely design with caps that have >>a rated lifetime of, say, 2000 hours: less than three months. >> >>John > > Have a look at the 2000 hour temperature rating spec. > > > > Boris Mohar > > Sure, but the 2000 hour rating is pretty much meaningless, except as a comparison value. Since the main failure mechanism is electrolyte loss through seals (followed by random explosions) one can't use the usual temperature-reliability extrapolations. In real life, most 'lytics last 100K hours or more. John
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