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Thread: Relibility of aluminium electrolytic capacitors in space

  1. #1 Relibility of aluminium electrolytic capacitors in space 
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    I'm looking for information on the reliability of common wet capacitors in space. How does the liquid electrolyte preform in a zero pressure environment? I'm considering changing my design to tantalum capacitors, is this necessary?


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  3. #2  
    Forum Masters Degree bit4bit's Avatar
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    I think it would probably be fine. The only thing I could see going wrong is the capacitor blowing under the rated voltage, since wet electrolytics are designed to have a weak spot at the top (marked by an engraved cross or lines), where the gas is directed when it blows, but that seems unlikely to me. I'd be surprised if you found any data on it, but if you really wanted to know, you could always set-up an experiment with an air-tight container, pump and one-way valve, a few electrolytics, function generator/scope, and see how the capacitance is affected (if at all) by different pressures, or if it blows.


    Chance favours the prepared mind.
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  4. #3  
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    I seem to remember tants as being particularly unreliable in spite of manufacturers hype. I fact many equipment makers stopped using them.

    Heat is a problem in space..no cooling air.
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