Need help picking the right capacitor

Discussion in 'Home Theater PCs & Equipment' started by Happy Hopping, Apr 24, 2019.

  1. Happy Hopping

    Happy Hopping [H]ardness Supreme

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    https://www.tedss.com/SKA220M2EJ27

    the above is the capacitor that I own. It last only 7 yr. The symptoms currently on this control board is : sometimes it turns on, sometimes it does not turn on at all, the board is for a washer, which is the reason I suspect the capacitors have failed

    the spec. is Jamiecon, made in Taiwan, 22 uF, 250V


    this is the actual photo of the circuit board

    https://picclick.com/Maytag-Whirlpo...Control-Board-W10296024-Rev-303101616967.html

    I went to digikey.com and found 160 listing w/ the above

    https://www.digikey.com/products/en/capacitors/aluminum-electrolytic-capacitors/58?k=250v 22uf

    I have the following questions:

    1) these spec. doesn't look that impressive, it says only 12K hr. at 105 deg. C, so what is the MTBF at say 30 deg. C?

    2) in regards to Ripple Current at Low Frequency, is 225 mA better than 300mA? which one should I pick?

    3) in regards to Ripple Current at High Frequency, is 450 mA better than 600mA? which one should I pick?

    4) does Japanese brand such as Nichicon usually means the capacitor is made in japan?
     
  2. Keljian

    Keljian Gawd

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    "Among Vishay’s long-life offering are the 128 SAL-RPM radial leaded aluminium capacitors. These also have a quoted endurance of 10,000 hours, but at +125˚C, yet they also claim a useful life at that temperature of 20,000 hours. However, if the temperature jumps to +175˚C, then the useful life figure drops quickly to just 2000 hours. Given such high temperatures are rare in many applications, the Vishay data sheets sensibly quote the useful life at +40˚C, which in this case is more than 300,000 hours."

    https://au.rs-online.com/web/genera...-a-long-life-aluminium-electrolytic-capacitor

    Lower ripple is better than higher ripple, generally speaking.

    Some Nichicons are made in Japan, others elsewhere afaik.

    When replacing 22uF, 24uF will usually be ok
     
    Last edited: Apr 24, 2019
  3. Happy Hopping

    Happy Hopping [H]ardness Supreme

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    thanks. So I'll pick the lower no. on both high / low freq.

    I wonder w/ these co., when they said 20000 hr., they should operating hr., so if the washer is just sitting at the basement, only in use a few hr. per week, it should last longer than 300,000 hr.
     
  4. Keljian

    Keljian Gawd

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    Pick the higher temp ones, (125C). Being in the basement without heat it should last a long while.

    Mtbf is mean time, doesn’t take into account things like temperature. Some caps from the 60s are still ok.
     
  5. Keljian

    Keljian Gawd

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    One thing I will say, make sure you get the right physical size, cause shoehorning larger caps in a board is not fun
     
  6. Happy Hopping

    Happy Hopping [H]ardness Supreme

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    thank you again. I replace the first 3 capacitor today, there is no change. The one that there is slight brown discoloring on the top, due to lack of stock, I have to order it before I can replace it.