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EMI/RFI Filters: L Type Filters

  • L Type Filters

    SeriesVoltageT° RangeCurrentFrequencyNotes

    FL

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

    +125°Cup to 10A (25A on demand)

    L Circuits DC/AC(400Hz)

    L1 Circuits AC

    26VAC to 230VAC

    +125°C0.05A to 20A

    L1

    L1 Circuits DC

    50VDC to 600VDC

    +125°C0.001A to 20A

    L1

    L2 Circuits AC

    26VAC to 230VAC

    +125°C0.05A to 20A

    L2

    L2 Circuits DC

    50VDC to 600VDC

    +125°C0.001A to 20A

    L2

    LL1 Circuits AC

    125VAC to 150VAC

    +125°C0.1A to 3.0A

    LL1

    LL1 Circuits DC

    50VDC to 100VDC

    +125°C0.1A to 3.0A

    LL1

    LL2 Circuits AC

    125VAC

    +125°C0.1A to 3.0A

    LL2

    LL2 Circuits DC

    50VDC to 100VDC

    +125°C0.1A to 3.0A

    LL2

Two elements: a feedthrough capacitor from line to ground, and an inductor connected in series with it between the input and output terminals. The capacitive element can be placed on either the line or load side of the filter, making it either a capacitive or inductive input. Its attenuation increases at 40 dB per decade from its cutoff frequency to at least that frequency where it exhibits a minimum attenuation of 70 dB. It maintains this level at higher frequencies. Schematic symbols and typical attenuation characteristics are shown below. They are commonly referred to as L filters. L1 indicates that the inductive element is on the end with the threaded mounting neck. L2 indicates that the capacitive element is on the end with the threaded mounting neck. L-Only Filters or LL are used when the difference between line and load impedance is large. The inductive element is best placed so that it faces the lower impedance.