Capcon International makes several EMI noise filters, including low pass filters and miniature sized component filters as well as microwave absorbers and other absorbative filters. Their minuature models filter either AC or DC power lines for up to 10 Amps at 50VDCW, 100VDCW, or 115VACW. Capcon also offers military grade filters.

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.

Cosel makes component sized Din rail mountable AC and DC (±50 VDC) noise filters with a rated current from 1 to 30 amps, single phase (250 V) and three phase models (500V).

DCI Digital makes custom noise filters including Band Pass filters, high and low pass filters, component sized filters, and ISM filters. Also available are diplexers, with channel isolation from >39dB to >90dB. Models can be built to military specification and are used in fixed and mobile military installations with many frequencies available starting at 30MHz.

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.

Okaya makes single phase and three phase EMI/RFI noise filters for AC power lines with single phase voltage ratings of 250VAC, 500VAC, 125VAC, and 2VAC with a current range of 1-300Amp, while the three-phase models voltage ratings of 250VAC, 500VAC, 460VAC, and current range from 5-700Amp.

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.

RFI Corp makes EMI/EMC/RFI noise filters including signal line filters, power line filters, facility filters, and component filters.  Their power line filters have a voltage range of 12 Vdc - 5500 Vac and a current rating of 0.01 - 5000 Amp. with a frequency of 50 - 400 Hz and attenuation of 120 db from 9KHz - 18GHz.  Medical grade and military spec models available.