Skip To The Main Content

EMI Filter Solutions

With decades of experience in the design and manufacture of Power Supplies, Astrodyne TDI has been researching, refining, developing and providing EMI filters for Commercial, Industrial, Medical and Military applications for more than 50 years. In that time, we’ve earned our reputation as an industry leader that helps companies succeed and operate within applicable electronic and energy standards.

Astrodyne TDI — 50 Years of Providing High-Quality EMI Filter Solutions

To learn more about our full line of standard and custom EMI filters, contact us or request a quote now. We’re in business to help your equipment — and your brand — be recognized for its power and reliability.

EMI Filters

  • Appliance and washing machine

    Appliance and Washing Machine Filters

    Astrodyne manufactures standard and customized custom filters for applications as diverse as portable power tools, vacuum cleaners, appliances and other power supplies…

  • Commercial MRI Room

    Commercial, MRI Room & Shielded Enclosure Filters

    MRI room and shielded room/ shielded enclosure filters help isolate inside (clean) environments from outside (dirty) electrical noise by attenuating…

  • custom-commercial-150

    Custom Commercial Filters

    Astrodyne designs cost-effective EMI filters and RFI filter solutions for project-specific applications for military, aerospace, commercial…

  • custom-military-150

    Custom Military Filters

    Astrodyne will address virtually any requirement for a custom EMI Filter. Our years of experience in providing EMI and RFI…

  • DC EMI

    DC EMI Filters

    Astrodyne offers standard and custom DC EMI filters for all applications including solar, telecom and DC de-coupling. Ratings are available up to 1200 VDC and 2500 A.

  • feed-thru-150

    Feed-Thru Filters

    Our feed-through filters provide high insertion loss from KHz to GHz frequencies for applications such as enclosures, mobile shelters…

  • Harmonic

    Harmonic Filters, PFC Coils, Line Reactors

    Harmonic/EMI power line filters. PFC Coils and Line Reactors address Power Line Harmonics and Power Quality issues associated with the high frequency switching designs.

  • IEC Inlet

    IEC Inlet Filters

    Ideal for industrial and commercial electronics that require EMI/RFI protection, including computers, communications equipment, LCD TVs, toys and sports and fitness…

  • Inverter

    Inverter EMI Filters

    These AC and DC filters are used for applications that have frequency inverters or inverter-based control systems.

  • Medical Grade

    Medical Grade EMI Filters

    Our complete line of off-the-shelf filters is available in a medical grade version. All filters are approved with variable line to ground capacitances to meet…

  • military - COTS

    Military EMI Filters - COTS

    Most MIL-COTS EMI filters’ ambient rating -40°C to +70°C (-40°F to +158°F) and operate in this range without any de-rating.

  • Military EMI-HEMP Sheilded

    Military EMI/HEMP Shielded Room Filters

    Our HEMP filters satisfy MIL-STD-188-125-1 requirements for short and intermediate pulses and are fitted with high-transient suppressors…

  • Single Phase

    Single Phase EMI Filters

    Single phase filters applications include switching power supplies, motor controllers, PWM circuits, induction cooking and …

  • suppression-150

    Suppression Components

    Astrodyne offers unrivaled expertise with suppression components including capacitors, coils and high frequency chokes.

  • telecom

    Telecom EMI Filters

    Our extensive offering of telecom filters includes AC and DC EMI power line filters, and custom telecom EMI filters for …

  • Tempest

    Tempest Filters

    Astrodyne is a leading provider of TEMPEST EMI filters. TEMPEST filters stop the high frequency EM signals (or noise) emanating inside the secure environment…

  • three-phase-filters-150x150

    Three Phase EMI Filters

    Our 3-phase filters, rated up to 480VAC, 520VAC and 600VAC for both Delta and WYE configurations, up to 2500A, are available in multi stage designs…

Why Use an EMI/RFI Filter?

In the broadest terms, EMI and RFI amount to interferences of an electrical or magnetic nature that can degrade how well a piece of electronic equipment performs or the quality of the signal it receives — which is responsible for its nickname “noise.”

From narrowband man-made EMI, such as the hum often heard from power lines, to natural broadband interference like solar flares and lightning strikes, our world is filled with electromagnetic interferences that can range from random and sporadic to continuous and constant.

In addition to external forms of EMI, there are a number of ways electronic devices can produce their own EMI through activities such as generating impedance, or an opposition to the current flowing through a given device. Besides the electronic noise present on signal and power lines, a good deal of high-frequency noise is produced by devices such as electronic appliances, controls, motors, inverters, power supplies and microprocessors.

Sensitive devices, such as computers, medical equipment and military equipment, need to function free of interference for purposes that are often of a mission-critical nature.

Off-the-Shelf Versus Custom EMI Filters

Depending on your product and business sector, you might need a cost-effective off-the-shelf EMI Filter for an application you manufacture. In regards to advanced Aerospace, Military and Medical devices, there might not be a substitute for the performance and ruggedness of a custom EMI filter.

Fortunately, at Astrodyne TDI, our wide selection of quality off-the-shelf EMI filters plus our in-house engineering and design expertise mean that we can always supply you with an EMI solution that seamlessly fits your equipment’s requirements as well as the industry standards. Our EMI Filter solutions range from a collection of small Single Phase components up to Industrial Grade 2,500A/690V Three-Phase Filters. Additionally, the majority of our standard inventory carries International Agency Approvals from recognized organizations such as Underwriters Laboratories (UL), Canadian Standards Association (CSA) and Conformité Européenne (CE).