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Old 23rd April 2012, 01:30 PM   #1
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Default Long term stabilty of Cerafines

I have a bunch of Elna Cerafines which i dearly love They must be around 10-12 years old, some used, some nos. As i needed to replace a large electrolytic in a crossover i thought i should give the Cerafines a try. To my surprise they all consistenly measured around 15% short of their rated capacitance.

Is this unusual? Are they drying out? Electrolytics are not known for accuracy and -15% is probably within stated limits, but i think most electrolytics err on the upside, while these are very consistently low.

Yes, tried reforming them. None of them needed it. Leakage current at rated voltage is a low 2uA.
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Old 24th April 2012, 12:23 PM   #2
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Has no one else measured their Cerafines?
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Old 27th April 2012, 02:53 AM   #3
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I don't think they are not rated for the currents you'd see in a crossover. They are a cap for local power supply decoupling and signal coupling in line level applications. Mayve you have some of the big main filter caps that they don't make any more. I have some 22,000 uf ones, but my cap meter won't measure that high a value

Last edited by ticknpop; 27th April 2012 at 02:57 AM.
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Old 29th April 2012, 12:12 PM   #4
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Quote:
Originally Posted by analog_sa View Post
Has no one else measured their Cerafines?
I noticed the same 15-20% lower values for cerafines that have been in circuit for a decade. I'd say that this is typical for gradual dry-out of non-aqueous electrolytes - though the Cerafine's temperature rating of 85c could suggest an aqueous electrolyte also.
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Old 1st May 2012, 03:33 AM   #5
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If the manufacturer can control their manufacturing process well enough, they make more profit by making capacitors below nominal value, while still in tolerance - less materials used. There is no guarantee that a 10 year old part still meets spec.
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