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Experimenting with Supercapacitors
Experimenting with SuperCapacitors Connectors Forum Is EDC and EDS family ESR really in ohm unit?
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  • confusion
  • experimenting with supercapacitors
  • esr
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Is EDC and EDS family ESR really in ohm unit?

misaz
misaz over 2 years ago

In EDC (and EDS) datasheets ESR @1kHz for all caps is specified in Ohm unit

image

but in most other supercap families it is specified in mili ohm unit, for example from DGH datasheet:

image

Is it correct or is it mistake in datasheet? I searched for methods for measuring ESR, but unluckily I do not have required vaweform generator and I did not find any way how to easily replace it. So, my only way is checking documentation. I originaly thought that it is mistake and Gough Lui in his comparison blog ( What’s Super about Supercapacitors? – Part 2: Types, Vendors, Safety & Specifications ) also "corected" it to miliuohm units, but in comparison sheet (https://www.cde.com/resources/downloads/Briefs/Supercap-compare.pdf) it is refered with the same unit and I do not think that CDE did the mistake twice.

So my question to all who can measure ESR is what is true? Is ESR of EDC and EDS capacitor families in range of ohms or miliohms?

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Top Replies

  • shabaz
    shabaz over 2 years ago in reply to Gough Lui +3
    There's some crazily-low ESR EDLC types in a flat format. TDK has some: https://product.tdk.com/en/search/capacitor/edlc/edlc/catalog For a project a while back I obtained one which is claimed 300…
  • Gough Lui
    Gough Lui over 2 years ago +2 verified
    Nice catch - my apologies, I didn't even notice the unit switcheroo. I had assumed they all used the same units based on reading the radial datasheets first that I didn't see that they said ohms! CDE are…
  • misaz
    misaz over 2 years ago in reply to Gough Lui +2
    Nice. Thanks for clarification. Looks like EDS and EDC has significantly different structure internally in comparison to radial supercaps.
  • dougw
    0 dougw over 2 years ago in reply to baldengineer

    Supercaps use an organic electrolyte called Acetonitile (methyl cyanide) which is considered a hazardous substance when it comes time for disposal.

    So be careful - as I'm sure you will be ....

    MSDS:

    https://www.sigmaaldrich.com/CA/en/sds/sial/271004

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  • baldengineer
    0 baldengineer over 2 years ago in reply to dougw

    There is not a "one electrolyte for all" when it comes to EDLCs. (Or any electrolytic capacitors, for that matter.)

    Very large can cells typically Acetonitrile.

    Smaller cylindrical cells, the ones that look like radial aluminum electrolytic capacitors, typically use Propylene Carbonate (PC).

    (In some cases, both styles use the opposites.)

    And coin cells usually use some form of acid.

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  • DAB
    0 DAB over 2 years ago in reply to dougw

    I am guessing that you want to keep them away from children who might swallow such things.

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  • JWx
    0 JWx over 2 years ago

    I think those are for memory backup - similar to Panasonic Goldcaps I was using. They are optimized for low self-discharge and designed for providing low current to the connected device: RTC module or SRAM unit for example (my Goldcaps have working current of a few milliamps IIRC). And they are usually constructed as 5V series pairs to allow for easy integration with 5V circuits.

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  • JWx
    0 JWx over 2 years ago in reply to JWx

    for example - Panasonic Goldcaps (now discontinued), recommended for memory backup, rated for 5.5V with capacitance range of 0.022-1F have ESR (1kHz) int the range of 30-150Ohm and have recommended discharge current of no more than 20mA. And as my capacitors are ~20 years old it seems that it was initial use case of supercaps, before high-current, low ESR models were devised...

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  • misaz
    0 misaz over 2 years ago in reply to JWx

    It make sense. Even they form factor indicates that they are designed as a replacement for coin batteries.

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