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.

Nextek Lightning makes EMI High Current DC lowpass filters in 50, 100, 175, and 250 Amp models, which all have a hugh insertion loss of over 60dB, an RF current of over 10 Arms, operate at high frequencies, from 1 kHz to >1GHz.

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.