Allen Avionics makes precision custom-built LC noise filters including band pass filters (400 Hz to 500 MHz), high pass filters (100Hz to 1000MHz), low pass filters (50Hz to 5000MHz; 20, 200, 500, and 1000 watts), and diplexers, with applications including microwave filtering.

Americor makes several EMI/RFI filters including LC filters and those that can be made to medical grade specifications and come in single (up to 30 Amp.) and three phase models (up to 250 Amp.), as well as power entry modules.

Coilcraft makes many EMI/RFI filters including surface mount and leaded components, LC filters, and signal line filters, which work on RJ-45, RJ-15, and RJ-11 lines. Their LC filters include high and low pass models and feature less than 0.3 dB insertion loss with 50 or 75 Ohm characteristic impedance.

Coilws.com makes several EMI/RFI filters including leaded filters, LC filters, and surface mount components. Their low power Line Filters for video signals have a current rating of 700 to 500 mA with inductace of 10 to 80 uH, while their high power common mode Line Filters come in horizontal or vertical mount models with current ratings of 0.38 to 6.0 amps AC and inductance of 1 to 120 mH.

Corcom Products makes EMI/RFI filters including LC filters, Power Line filters, ISM filters, Signal Line filters, Power Entry modules, DC filters and facility filters. Their power entry modules have a current rating of 1 to 15 Amps, while their DC filters have a current rating of 1 to 125 Amps. Corcom filters can be used for microwave filtering as well as medical and military applications.

DJM Electronics makes several RFI/EMI filters including power line, facility, and signal line filters as well as custom filters, running on AC or DC lines. Their power line filters have a current rating of 10 to 250 Amps, while their standard facility filters have a rating of 2X5 amps to 4x300 amps.

Filtronetics makes custom EMI/RFI noise filters such as bandpass, high pass, bandstop, and lowpass filters, with frequencies of >1MHz to 6GHz. They also have LC filters, diplexers, surface mount models, and ISM filters. Some applications include military and microwave filtering.

KR Electronics makes custom and standard filters for commercial and military uses including Low Pass filters, high pass filters, band pass filters, LC filters, Diplexers, and surface mount filters. Their low-pass filters have a cutoff frequency of 5 HZ to 500MHz, while their bandpass filters have a center frequency of 220 Hz to 875 MHz.

Microwave Filter Company makes noise filters and components including LC filters, band-pass filters, miniature filters, ISM filters, and Diplexers. Their high quality passive filters operate on 5 Hz to 50 GHz frequencies and their WiMax diplexers use bands which are mutually isolated by a minimum of 55 dB with a maximum 1dB of insertion loss per band.

MTE makes single and three phase EMI/RFI filters, including LC filters, operating at 50/60Hz in ratings up to 600 volts with applications including AC and DC motor drives, and Active Harmonic Filters.

MtronPTI makes custom noise filters including LC filters, with a frequency range from 0.000 to 5000.000 MHz, available as surface mount, through-hole or connectorized with an Input/Output Signal to 200-Watt and higher. Also available are microwave filters and mil-spec filters, with certification for MIL-STD-790, MIL-PRF-3098, and MIL-PRF-55310.

Newmar Power makes noise filters including Signal Line filters, LC filters, RFI rilters, and DC filters, with models rated at 150 Amp., 10 Amp., and 25 Amp. designed to run on 6-48 VDC systems.

PA&E makes ceramic EMI/RFI filters for use in electronic packaging including microwave high-frequency packages, a flexible leaded filter with a rated voltage from 50 - 500VDC and a rated current of 5 Amperes, and broadband low-pass filters with insertion-loss of 20, 40, or 60dB/decade with voltage ratings from 50 VDC to 240 VAC and current ratings of .10Amp to 50Amp. Applications include microwave filtering, medical grade, and military specifications.