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EMI Filters

As experts in the field of electromagnetic interference, Captor Corporation develops superior quality EMI filter solutions. Whether your application involves signal, tempest, power, or other types of interference, we can identify the most appropriate EMI filter. On this products page, you can learn more about our product development capabilities and the types of EMI filters we offer.

Select Your EMI Filter

Captor Corporation offers several types of standard EMI filters, including:

DC EMI Filters. Rated for voltages between 0 to 400 VDC and currents that range between 1 and 25 A

AC Three-Phase EMI Filters. For voltages of 120/208 VAC at 50/60 Hz and 400 Hz, and currents that range from 1 to 25 A.

AC Three-Phase with Filtered Neutral EMI Filters. For voltages of 120/208 VAC at 50/60 Hz and 400 Hz as well as currents between 1 and 25 A.

AC Single-Phase EMI Filters. Rated for currents between 1 and 25 A, and voltages of 125/250 VAC at 50/60 Hz and 400 Hz.

Circuit Card Assembly (CCA) Mounted Electromagnetic Interference (EMI) Filters. We offer several filters designed to meet MIL-STD-461 compliance requirements and also provide custom-designed solutions.

Visit our main EMI filters page for more information on these products.

Additional EMI Filter Solutions We Offer

In addition to our selection of standard product offerings, Captor Corporation also offers a range of additional EMI filter solutions. Our full-service support begins with your product's conception and includes everything from prototyping to testing and more.

Design & Prototyping

Captor Corporation has developed over 10,000 designs and offers complete engineering support, from your project's inception to completion. Our design and prototyping services include:

Filter circuit analysis and design

Quick prototyping turn-around

Filter packaging and layout

Design and fabrication support for any imaginable chassis configuration

Build to print services

Testing & Safety

All Captor Corporation products undergo thorough inspection and testing processes to ensure they will perform reliably and withstand environmental challenges. The testing procedures we use include:

Qualification testing. Performed to provide a baseline for any subsequent acceptance tests and to verify the design and manufacturing process.

Environment Stress Screening (ESS) testing. Performed to ensure device quality and functionality. Components are exposed to environmental stresses such as vibration and thermal cycling.

Built-in transient and HEMP/EMP protection. Designed to suppress several forms of EMI, HEMP/EMP protection systems provide targeted protection against intentional EMI, nuclear detonations, or solar flares.

Termination Interfaces

Captor Corporation offers a diverse catalog of termination interfaces and can also design custom interfaces to meet the needs of demanding applications. The products we offer include:

Threaded terminals. These are commonly used to facilitate the tightening of aircraft cable assemblies.

Solder terminals. These terminals feature a heat shrink connection as well as internal sealant and withstand use in harsh environments.

Connectors (military, D-sub, IEC, and commercial, among others). These connectors incorporate electronic circuitry to strip line signals of unwanted HRF or RF noise. Captor Corporation supplies many styles to meet diverse application requirements.

Wire leads and harnesses. EMI filter cables and wiring systems have a big impact on filter performance. Captor Corporation supplies high-performing solutions tailored to the needs of each application.

Custom-designed interface. We can build the ideal custom-developed termination solution that adheres to all industry standards.

What Your EMI Filter Can Do For You

Electronic systems are exposed to different types of external electromagnetic noise or interference (EMI), which can impair their performance. To mitigate this problem, EMI filters can be installed to suppress the noise and eliminate the effects of electromagnetic interference. EMI filters are available in numerous types to meet the needs of highly diverse electrical systems.

After an EMI filter is incorporated into an electrical system, it works by delivering higher resistance to high-frequency signals, effectively eliminating the effects of unwanted high-frequency noise. This occurs using a combination of inductors, or small electromagnets, and capacitors. A properly selected EMI filter can protect and regulate highly sensitive electronic systems and ensure their reliable performance. They are used in industries ranging from aerospace and automotive to medical, energy, and more.

Standard EMI Filters from Captor Corp

Captor Corporation supplies a comprehensive selection of standard EMI filters for use in applications that don't require customization. For assistance in identifying the most suitable product for your application, reach out to our team for advice.

With over 50 years of experience in the electronic filter industry, Captor Corporation is a trusted provider of EMI filters for the world's most demanding applications. For additional information on our products contact us or request a quote today to get started.

Request Information

DC EMI Filters
DC EMI Filters
(20)
- Voltage Rating : 0 - 400 VDC
- Visual/Mechanical : Per MIL-PRF-15733, paragraph 4.6.1
- Insulation Resistance : 1500 MΩ minimum per MIL-STD-202, Method 302
- DWV : 1000 VDC line-to-line & line-to-chassis per MIL-STD-202, Method 301
- Insertion Loss : Per MIL-STD 220
- Voltage Drop : Less than 1% of rated voltage per paragraph 4.6.8 of MIL-PRF-15733
- Terminal Strength : Per MIL-STD-202, Method 211
- Operating Temperature : -55º C to +71º C
- Storage Temperature : -55º C to +105º C
- Threaded Terminals : 10-32UNF-2A
- Threaded Inserts : 10-32UNF-2B
- Bracket Mounting Holes : 0.203" Diameter
- Chassis & Terminal Finish : Electro Tin-Lead
- Chassis Material : CRS
AC Three Phase EMI Filters
AC Three Phase EMI Filters
(20)
- Voltage Rating : 120/208 VAC @ 50/60 Hz and 400 Hz
- Visual/Mechanical : Per MIL-PRF-15733, paragraph 4.6.1
- Insulation Resistance : 1500 MΩ minimum per MIL-STD-202, Method 302
- DWV : 1000 VDC line-to-line & line-to-chassis per MIL-STD-202, Method 301
- Insertion Loss : Per MIL-STD 220
- Voltage Drop : Less than 1% of rated voltage per paragraph 4.6.8 of MIL-PRF-15733
- Terminal Strength : Per MIL-STD-202, Method 211
- Operating Temperature : -55º C to +71º C
- Storage Temperature : -55º C to +105º C
- Threaded Terminals : 10-32UNF-2A
- Threaded Inserts : 10-32UNF-2B
- Bracket Mounting Holes : 0.203" Diameter
- Chassis & Terminal Finish : Electro Tin-Lead
- Chassis Material : CRS
AC Three Phase with Filtered Neutral EMI Filters
AC Three Phase with Filtered Neutral EMI Filters
(20)
- Voltage Rating : 120/208 VAC @ 50/60 Hz and 400 Hz
- Visual/Mechanical : Per MIL-PRF-15733, paragraph 4.6.1
- Insulation Resistance : 1500 MΩ minimum per MIL-STD-202, Method 302
- DWV : 1000 VDC line-to-line & line-to-chassis per MIL-STD-202, Method 301
- Insertion Loss : Per MIL-STD 220
- Voltage Drop : Less than 1% of rated voltage per paragraph 4.6.8 of MIL-PRF-15733
- Terminal Strength : Per MIL-STD-202, Method 211
- Operating Temperature : -55º C to +71º C
- Storage Temperature : -55º C to +105º C
- Threaded Terminals : 10-32UNF-2A
- Threaded Inserts : 10-32UNF-2B
- Bracket Mounting Holes : 0.203" Diameter
- Chassis & Terminal Finish : Electro Tin-Lead
- Chassis Material : CRS
AC Single Phase EMI Filters
AC Single Phase EMI Filters
(20)
- Voltage Rating : 125/250 VAC @ 50/60 Hz and 400 Hz
- Visual/Mechanical : Per MIL-PRF-15733, paragraph 4.6.1
- Insulation Resistance : 1500 MΩ minimum per MIL-STD-202, Method 302
- DWV : 1000 VDC line-to-line & line-to-chassis per MIL-STD-202, Method 301
- Insertion Loss : Per MIL-STD 220
- Voltage Drop : Less than 1% of rated voltage per paragraph 4.6.8 of MIL-PRF-15733
- Terminal Strength : Per MIL-STD-202, Method 211
- Operating Temperature : -55º C to +71º C
- Storage Temperature : -55º C to +105º C
- Threaded Terminals : 10-32UNF-2A
- Threaded Inserts : 10-32UNF-2B
- Bracket Mounting Holes : 0.203" Diameter
- Chassis & Terminal Finish : Electro Tin-Lead
- Chassis Material : CRS
Circuit Card Assembly (CCA) Mounted Electromagnetic Interference (EMI) Filters
(11)

If your system has MIL-STD-461 compliance requirements, many of the DC-DC converters on the market will not be compliant. The EMI filters listed below have been designed to meet this requirement. In addition, custom voltages/current ratings/size can be designed to meet your specific application.

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DC EMI Filters

AC Three Phase EMI Filters

AC Three Phase with Filtered Neutral EMI Filters

AC Single Phase EMI Filters

Circuit Card Assembly (CCA) Mounted Electromagnetic Interference (EMI) Filters

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