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| 44 year old electrolytic capacitor as good as new |
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| nctnico:
--- Quote from: all_repair on March 07, 2020, 01:28:01 am ---These well made capacitors most probably can go on for additional 5 year or more, where newly made capacitors with all kind of cost cutting likely last for only 2 years. --- End quote --- No. Nowadays you can buy electrolytics with a wide variety of life expectancies. Sure if you buy the cheapest one it will be crappy but it doesn't mean you can't buy good ones. |
| mcovington:
--- Quote from: nctnico on March 08, 2020, 12:43:55 am --- --- Quote from: all_repair on March 07, 2020, 01:28:01 am ---These well made capacitors most probably can go on for additional 5 year or more, where newly made capacitors with all kind of cost cutting likely last for only 2 years. --- End quote --- No. Nowadays you can buy electrolytics with a wide variety of life expectancies. Sure if you buy the cheapest one it will be crappy but it doesn't mean you can't buy good ones. --- End quote --- Precisely. Here is one rated for 10,000 hours (= more than a year) at 105 C. Depending on how you interpret Arrhenius' Law, that might be more than a century at room temperature! https://www.digikey.com/product-detail/en/panasonic-electronic-components/EEU-FR1V222L/P14450-ND/2433584 |
| all_repair:
--- Quote from: mcovington on March 08, 2020, 01:42:24 am --- --- Quote from: nctnico on March 08, 2020, 12:43:55 am --- --- Quote from: all_repair on March 07, 2020, 01:28:01 am ---These well made capacitors most probably can go on for additional 5 year or more, where newly made capacitors with all kind of cost cutting likely last for only 2 years. --- End quote --- No. Nowadays you can buy electrolytics with a wide variety of life expectancies. Sure if you buy the cheapest one it will be crappy but it doesn't mean you can't buy good ones. --- End quote --- Precisely. Here is one rated for 10,000 hours (= more than a year) at 105 C. Depending on how you interpret Arrhenius' Law, that might be more than a century at room temperature! https://www.digikey.com/product-detail/en/panasonic-electronic-components/EEU-FR1V222L/P14450-ND/2433584 --- End quote --- On paper, you may be right. I only buy the best one affordable for repair. Exclude those that need 1000 MOQ, or at more than USD10 a piece. I have no data to proof right or wrong, but some practical observations. From the construct of old cap especially at the joints compare to the new ones, they are different. The good old cap are much better. And insulation material decomposes over time, when there is any change to these material, only time can tell would the new materials performed as desired. I have seen equipments that came back 2-3 years later with the new replaced capacitors showing aging and needing replacement but the unreplaced old cap still measured well. |
| james_s:
Electrolytic capacitors made in the 1970s that are still good are not rare, I have quite a few in various things. Some applications are much harder on capacitors, switchmode power supplies and CRT displays for example. As a 50/60Hz filter in a low power supply a good quality capacitor can last decades. |
| wraper:
--- Quote from: all_repair on March 08, 2020, 02:11:24 am ---I have seen equipments that came back 2-3 years later with the new replaced capacitors showing aging and needing replacement but the unreplaced old cap still measured well. --- End quote --- Probably because those which were not replaced were not under stress to begin with, unlike those which failed. Also capacitors are often replaced with wrong type. You shouldn't simply put anything even of top brand when replacing capacitors in places with high ripple current like in SMPS. And not all LOW ESR series are equal, rated ripple current can vary drastically. |
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