EMIS Highlights Feedthrough Components for High-Frequency Noise Suppression and EMC Performance

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EMC solutions provider EMIS has announced an expanded range of feedthrough components designed to pass conductors through grounded barriers while delivering high-frequency noise suppression and improved electromagnetic compatibility (EMC) performance.

Feedthrough capacitors, a core offering in the portfolio, are single capacitors mounted through a metal panel or chassis, allowing a signal or power conductor to pass while shunting high-frequency noise to ground. The approach is highly effective at suppressing interference from the kilohertz region up to the gigahertz range, depending on construction and installation.

By providing a low-impedance path to ground for unwanted high-frequency signals, the components deliver improved insertion loss at higher frequencies compared with standard two-lead capacitors. They help prevent radio-frequency interference from entering or leaving shielded equipment and enclosures.

Designed for high reliability and mechanical robustness, EMIS feedthrough capacitors are suitable for harsh environments across aerospace, military, industrial, and medical systems. Most versions feature threaded bulkhead mounting to ensure a secure mechanical fit and low-impedance grounding to the chassis or panel. EMIS notes that proper bonding of the capacitor shell to the metalwork is essential, as poor grounding can significantly reduce high-frequency suppression performance.

Key features of feedthrough capacitors include:

• Current ratings typically up to 200 A and AC voltages up to 250 VAC, depending on type and size
• Capacitance options from approximately 2.2 to 4700 nF for varied attenuation requirements
• Designs in accordance with IEC/EN 60384-14 for safety-related capacitors
• Specified torque requirements on threaded terminals and nuts to ensure stable long-term contact resistance
• Versions meeting EMC and safety-related classes (including Y2) and specific pulse-test or surge requirements

EMIS also offers feedthrough filters, which integrate capacitors and inductors—and, in some designs, resistors—into a single housing to provide broadband attenuation of conducted noise. Compared with a single feedthrough capacitor, these filters achieve higher insertion loss across a wider frequency range, extending to lower frequencies where line impedance dominates.

Key features of feedthrough filters include:

• Electrical ratings typically up to 200 A and 250 VAC
• Capacitance values from approximately 10 to 4700 nF
• Compliance with UL 60939-3, IEC 60939-1&2, and CSA C22.2 No. 8 for passive EMC components

Feedthrough EMC components are used widely across sectors, including:

• RF & Communications: protecting control and power penetrations in RF circuits, telecom base stations
• Power & Energy: reducing emissions in SMPS systems, UPS units, chargers, and drives
• Aerospace & Military: ensuring high reliability at bulkhead interfaces for avionics and mission-critical systems
• Digital & Control Systems: supporting high-speed digital electronics, motor drives, PLCs, and I/O lines crossing shielding boundaries
• EMC Protection: used in shielded rooms and EMC chambers
• Medical Devices: supporting implantable and external medical electronics requiring low leakage and high reliability
• Noise Reduction in Panels: suppressing noise on wiring routed near inverters, motors, and switching equipment
• Environmental and Outdoor Applications: providing sealed filtering solutions in rugged conditions
• Networking & Communication: preserving EMC performance at shielded-enclosure interfaces

EMIS stated that it aims to provide an end-to-end solution for the industry’s evolving EMI challenges. With a global supply footprint across eight industry segments, the company continues to invest in technology and engineering capabilities to deliver efficiency and seamless customer support.