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Jean-Luc.Suchail
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Re: Alum Electrolytics have bad "rep"
Jean-Luc.Suchail   2/3/2017 2:07:33 AM
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Since a few years electrolytic caps have shrunk down in size, but also in reliability.

They are currently 90% of the failures I have to face, usually when the first one fails in a device, I replace all of them with better quality than these low cost Made In China stuff - I know, it is getting almost impossible to get non MIC components, but there are different qualities -. All that just to save a few cents on capacitors, and in most cases sell a new complete monitor for a component that costs less than a Dollar.....

This world is really getting crazy...

 

Jean-Luc.

elizabethsimon
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Re: Alum Electrolytics have bad "rep"
elizabethsimon   2/1/2017 3:55:11 PM
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yes

dt_hayden
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Re: Alum Electrolytics have bad "rep"
dt_hayden   2/1/2017 2:56:23 PM
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Blue boxes?

elizabethsimon
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Re: Alum Electrolytics have bad "rep"
elizabethsimon   2/1/2017 1:22:17 PM
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Sounds like the company I work for :). We use alum electrolytic caps but as you said, highly derated and only where we need so much capacitance that it's not feasible to get it any other way.

David Ashton
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Re: Alum Electrolytics have bad "rep"
David Ashton   2/1/2017 2:02:07 AM
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There are other things to consider apart from the voltage.  Some capacitors have heavy currents going through them as well.  I wrote this story on what happens if you don't consider this parameter...

MeasurementBlues
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Re: Alum Electrolytics have bad "rep"
MeasurementBlues   2/1/2017 1:25:07 AM
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Not much margin on the 16V caps with the supply running at 12V. No ESR specs on the package. Yes, I could have searched for them or manybe used 25V caps, but the 16V matched the original and that's what was in stock that night. But hey, customer is happy. What else matters?

lakehermit
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capacitor plague
lakehermit   1/31/2017 5:29:49 PM
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This capacitor failure is such a bad problem it has its own Wikipedia page.

https://en.wikipedia.org/wiki/Capacitor_plague 


KKing1
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Re: Alum Electrolytics have bad "rep"
KKing1   1/31/2017 5:28:56 PM
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I have to believe somewhere in here component quality plays a part.

Several Samsung 22 inch monitors failed within a year. Swollen electolytic caps in the back-light supply, some Chinese vendor I had not heard of.

Replaced with same type and rating from Panasonic, monitors still runing 8 years later.

 

dt_hayden
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Re: Alum Electrolytics have bad "rep"
dt_hayden   1/31/2017 3:16:12 PM
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There is an outfit that makes power system contol and measurement equipment, which offers 10 year warranty in a continuous duty environment, and they derate everything to 10% (90% derate) to obtain the reliability they desire.  Having said that, I don't recall even seeing any alum electrolytic caps on their boards when I interviewed there ~15 years ago.  They used an extremely conservative design approaches and have much success in their market.

MWagner_MA
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Re: Alum Electrolytics have bad "rep"
MWagner_MA   1/31/2017 2:17:45 PM
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Yeah, there are a few parameters to be concerned with.  The big one many cheap power supply vendors miss is the ripple current and temp (related).  To have something intentionally last 10yrs (87,360hrs) you have to run the calculation in that app note I referenced.  It is possible, but the challenge is low temps in a very tight package with no ventilation.

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