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Glass-Sealed EMI Filters for aerospace and defense applications.

Glass-Sealed EMI Filters for Aerospace and Defense Applications

Supporting defense and aerospace applications subject to extreme environmental conditions, Glass-Sealed EMI Filters are hermetically sealed to prevent moisture and contaminant ingress. These robust filters enhance long-term system reliability, improve efficiency, reduce maintenance requirements and prevent damage from electromagnetic interference (EMI).

Circuit Options Current Capacitance Voltage
C, LC, Pi 5.0 to 15.0A 0.15 to 2.8 µF Up to 400V (DC), 250V (AC at 400 Hz)

Glass Sealed EMI Filters

Glass-sealed EMI filters.

Features and Benefits


The extreme conditions and demands placed on electronic components in defense and aerospace applications require robust, reliable and high-performance solutions. Components like EMI filters, which are necessary for preventing damage to electronic systems and maintaining consistent operation, must withstand extreme temperatures, high-pressure and vacuum environments, as well as shock and vibration forces. These components must also support easy system integration and ensure supply chain security.

Manufacturers need rugged, sealed EMI filters that ensure energy efficiency and consistent power management in noisy electronic systems. These filters must be durable enough to ensure ultra reliable operation in harsh environments while offering design flexibility to meet the needs of a variety of different applications, devices and regulatory requirements.

Glass-Sealed EMI Filters from Molex use hermetically sealed glass and ceramic seals to prevent moisture or contaminants from compromising the filter’s operation. Discoidal ceramic capacitors and a variety of filter circuit type, voltage, current and attachment options ensure seamless integration with diverse systems. These filters meet various MIL-SPEC requirements and use a US-based supply chain, helping accelerate design and qualification processes while reducing sourcing risks and enhancing quality.

Enhanced Durability for Demanding Environments

These hermetically sealed solutions feature glass or ceramic seals with exceptional EMI filtering performance, making them ideal for aerospace, defense and industrial applications subject to high moisture, solvent exposure or severe environmental conditions.

Glass-Sealed EMI Filter suitable for harsh environments.

Flexible Design Options and Mounting Styles

Various options are available to ease design constraints and help meet application-specific requirements. Circuit options include multiple C, Pi and L types, while various voltage, current and capacity ratings, as well as mounting styles, provide seamless integration and improve flexibility.

Glass-Sealed EMI Filter

Compliant Solutions for Military and Aerospace Applications

The robust, sealed design and high-reliability construction meet a variety of military and aerospace requirements, including MIL-PRF-15733, DSCC 84084 and MIL-PRF-28861 qualifications.

Military and aerospace compliant glass-sealed EMI filter.

Enables use in extreme environments
High-temperature terminals and hermetic glass seals that undergo 100% helium-leak testing ensure long-term, reliable performance and help prevent failures even in high-temperature, high-pressure or vacuum conditions.

Simplifies compliance for military and aerospace applications
Prequalification to a broad range of standards, such as MIL-PRF-15733 and MIL-STD-202, helps streamline development processes, accelerates time to market and ensures reliable performance.

Ensures resistance to EMI
Discoidal ceramic capacitors and hermetic sealing help eliminate EMI-related disruptions, ensure consistent system accuracy, and enhance energy efficiency in dense or noisy applications.

Enhances design flexibility
Multiple filter circuit options with frequencies from 1 kHz to 10 GHz, along with a range of voltage ratings and thread sizes, enable seamless integration into unique systems and reduce engineering challenges.

Datasheets and Guides


Applications by Industry


Cockpit controls
Communication equipment
Hydraulic and control systems
Power supplies
Radar systems

Cockpit controls
Communication equipment
Hydraulic and control systems
Military vehicles
Power supplies
Radar systems
Weapon systems

DC-to-DC converters
Industrial motor controls
Instrumentation
Power lines
Power supplies
Test equipment

Implantable products
Medical imaging equipment
Medical surgical tools
Patient care monitors
Portable dialysis equipment

Computer and peripheral equipment
Data and signal lines
Digital and switching equipment
Internet protocol digital subscriber line access multiplexer (IP DSLAM) systems
Microwave devices

This is not a definitive list of applications for this product. It represents some of the more common uses.

Frequently Asked Questions


What are Glass-Sealed EMI Filters?

Glass-Sealed EMI Filters are EMI filters with glass-to-metal or ceramic-to-metal hermetic seals. These filters feature high-reliability discoidal ceramic capacitors and customizable configurations to provide superior EMI protection, energy efficiency, extreme durability and broad standards compliance for military, aerospace, industrial and medical systems subject to harsh conditions.

How do Glass-Sealed EMI Filters improve system reliability in RF applications?

These filters use hermetic sealing technology to prevent moisture, pressure fluctuations and temperature extremes from impeding performance. Combined with high-reliability discoidal ceramic capacitors, Glass-Sealed EMI Filters ensure consistent EMI suppression, prolonging system life and maintaining signal integrity across harsh operational environments.

What customization options are available for Glass-Sealed EMI Filters?

Molex offers a wide range of customizable configurations, including circuit types (C, LC and Pi), various voltage ratings (50 to 400V DC), high-current and low-equivalent series resistance (ESR) options, and mechanical selections, including different thread sizes and mounting styles. This allows RF engineers to tailor filters to specific system designs and needs.

Can Glass-Sealed EMI Filters be used in high-frequency applications?

Yes, Molex EMI filters are designed for high-frequency applications. Their low-ESR discoidal ceramic capacitors support effective noise suppression at high frequencies and maintain signal integrity. These filters are ideal for RF systems in demanding defense, aerospace and telecommunications environments.