What the diff of this Xrated CAP have same values

Discussion in 'General Electronics Chat' started by parmaja, Sep 15, 2014.

  1. parmaja

    Thread Starter Active Member

    Jul 2, 2008
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    What the different of this X-Rated Capacitors that have same values 105K and 400v but not have the same size.
    [​IMG]
     
  2. ISB123

    Well-Known Member

    May 21, 2014
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    Image link is broken.
     
  3. parmaja

    Thread Starter Active Member

    Jul 2, 2008
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  4. ISB123

    Well-Known Member

    May 21, 2014
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    There are compact and standard sized ones. Compact ones probably cost more but there is probably no difference in their performance.I guess it depends on the manufacturer with what size they decide to go with.
     
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  5. crutschow

    Expert

    Mar 14, 2008
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    The smaller ones may use a dielectric with a high voltage rating so they can use a thinner film when they are made.
    Or the smaller ones may be what are called metalized capacitors which use a thin deposited layer of metal on the dielectric instead of a thicker separate metal film for the conducting capacitor plate. That allows the layers to be thinner, giving a smaller cap.
     
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  6. parmaja

    Thread Starter Active Member

    Jul 2, 2008
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    So the they all same, but just materials.
    Thank you.
     
  7. alfacliff

    Well-Known Member

    Dec 13, 2013
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    there might be a difference in the internal inductance (parasitic inductance) of the two caps.
     
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  8. ian field

    Distinguished Member

    Oct 27, 2012
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    "X rated" made me think of the capacitors made for mains input filters, those are self healing types that don't produce a load of carbon deposit when a voltage spike ruptures the dielectric. The main objective is to avoid a sustained arc that starts a fire or blows bits of capacitor foil over everything.

    Resin dipped types like some in the link can be typical of the special dielectric types used for high energy pulse applications, such as flyback tuning in CRT TVs.
     
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