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EMI/RFI Filters: C Type Filters

  • C Type Filters

    SeriesVoltageT° RangeCurrentFrequencyNotes

    C Circuits AC

    50VAC to 230VAC

    +125°C5A to 15A


    C Circuits DC

    50VDC to 500VDC

    125°C5A to 15A



    50Vdc to 500Vdc (115Vac 400Hz complience)

    +125°Cup to 10A (25A on demand)

    C Circuits DC/AC(400Hz)

A single element: a capacitor from line to ground, with a through wire connecting the input to output. It has attenuation characteristics that increase at 20 dB per decade from its cutoff frequency to at least that frequency where it exhibits a minimum attenuation of 60 dB. It maintains this attenuation at higher frequencies. A feedthrough capacitor filter is usually the best choice for filtering lines that exhibit very high impedance. Its schematic symbol and its attenuation characteristics are shown below. A feed through capacitor, in this catalog, will be referred to as a C filter.

C-Only Filters are the choice for very high impedance lines.