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.

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.

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.

Qualtek makes EMI filters including power entry filters with Amp ratings of 1, 2, 3, 4, 6, 10, or 20V, IEC connector filters, chassis mount filters, and multi-function module filters as well as medical grade filters with Amp ratings of 3, 6, or 10V.

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.

Schurter makes several noise filters including power entry modules, and single and three phase power line filters. Their single phase line filters have a current rating of 0.5A - 36A with voltage of 125VAC or ±80 VDC while their three phase filters have a current rating from 6 - 1100A and run on 440, 480, or 520VAC. In addition, Schurter makes ISM filters and medical grade filters.

Tusonic makes a wide line of EMI/RFI filters including both AC and DC line models, surface-mount filters, feed-through filters, and custom filters. Other EMC products carried include ceramic variable trimmer capacitors, and radial leaded disc, tubular, and WEECON Plate capacitors.

WEMS Electronics makes EMI/RFI custom filters including power line and signal line filters which meet various military specifications including MIL-PRF 15733, MIL-PRF-28861, MIL-STD-220A, MIL-I-45208, and MIL-STD-202. Services include filter circuit design & analysis, environmental tests, baseline documentation, and more.