1 million hours ?

Discussion in 'General Electronics Chat' started by iulian28ti, Jan 30, 2010.

  1. iulian28ti

    Thread Starter Member

    Dec 4, 2009
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    http://www.cde.com/catalogs/947C.pdf
    PAGE 3 graph

    I know it's Cornell-Dubillier, and i know lower voltage prolongs capacitor life, but anyone can exaggerate. What do you think, do they exaggerate ? :confused:
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    Look at it this way - it's going to take over 114 years to find out.
     
  3. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    And let me guess it has a 12 month warrantee? :D
     
  4. iulian28ti

    Thread Starter Member

    Dec 4, 2009
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    That would be funny :p
     
  5. someonesdad

    Senior Member

    Jul 7, 2009
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    If it's important to you, call them and find out. Reliability prediction like this is often based on accelerated testing at higher temperatures which is then extrapolated down to lower temperatures using an Arrhenius relationship. Personally, I would evaluate the veracity by talking to the folks who did the testing, seeing the data and failure distributions, and learning about the physics of the failure mode(s). Unless you're going to be a big customer, they almost certainly won't share these data.
     
  6. t06afre

    AAC Fanatic!

    May 11, 2009
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    1 million hours ?
    Over my dead body, I would say
     
  7. Paulo540

    Member

    Nov 23, 2009
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    Just be sure to pass it down through the family. That way. if your great-grandkid uses it to build a time machine they could come back and tell you now.
     
  8. VoodooMojo

    Active Member

    Nov 28, 2009
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    loosewire will be proud of you!
    this could be one of his "off topic" threads:rolleyes:

    i say this with deep respect for loosewire!
     
  9. beenthere

    Retired Moderator

    Apr 20, 2004
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    Grossly over spec'ing the components only works if the power line never gets hit by lightning. It never hurts to have double the voltage rating, but more than that is iffy as to confidently extending component lifetime.

    At one time, using silver mica capacitors (don't think they are sold any longer) at much less than their voltage rating led to early failure.

    Some manufacturers are pretty good about publishing component lifetime studies.
     
  10. iulian28ti

    Thread Starter Member

    Dec 4, 2009
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    Well.... actually i wanna buy 1 million dollar worth of trimpots.

    Who would have thought electronics is full of humor :)
     
  11. 3ldon

    Active Member

    Jan 9, 2010
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    Depends what type of capacitor, water based units will corrode and evaporate.
    metalized polypropylene could conceivably last 100 years, my 1983 kenmore microwave that has been plugged in for 27 years now can attest to that fact.
     
  12. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    I've got some really nice 1960's milspec tantalum caps that were pulled from obsoleted military equipment, they are 50 years old and still working perfect and I use them sometimes. But then they are quality too, non-corrosive metal outer shell, epoxy filled and low corrode nickel steel legs that still look good considering they sat about in a junkyard for probably 10 years in the weather before I get them.

    Ahh for the good old days when they cared about the quality of a component.
     
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