FeedThrough EMC solutions from EMIS Provide High Frequency Noise Suppression

­Global EMC solutions provider EMIS offers a range of FeedThrough components designed to pass conductors through a grounded barrier while providing high‑frequency noise suppression and improved EMC performance.​

FeedThrough Capacitors are a single capacitor mounted through a metal panel or chassis, allowing a signal or power conductor to pass while shunting high‑frequency noise to ground.​ This is highly effective at suppressing high‑frequency interference from approximately the kilohertz region up to the gigahertz range, depending on the construction and installation.​

The component provides a low‑impedance path to ground for unwanted high‑frequency signals, improving insertion loss at higher frequencies compared with standard two‑lead capacitors.​ It helps prevent radio‑frequency interference (RFI) from entering or leaving shielded equipment and enclosures.​

The design offers high reliability and mechanical robustness, suitable for harsh environments such as aerospace, military, industrial, and medical systems. Components are usually threaded for bulkhead mounting, ensuring a secure mechanical fit and a low impedance ground connection to the chassis or panel. The capacitor shell must be bonded firmly to the metalwork to maintain effective high frequency noise suppression; poor grounding significantly reduces performance.

Key features of FeedThrough Capacitors include:

• Typical current ratings to approximately 200 A and AC voltages up to 250VAC, depending on type and size.​
• Capacitance values are available from approximately 2.2nF to 4700nF to support a wide range of impedance and attenuation requirements.​
• Devices are designed in accordance with IEC/EN 60384‑14 for safety‑related capacitors.​
• Specified torque should be applied to threaded terminals and nuts to avoid mechanical damage and to guarantee stable contact resistance over lifetime.​
• Versions are available that meet EMC and safety‑relevant capacitor classes (Y2) and/or specific pulse‑test or surge requirements.

A FeedThrough filter integrates capacitors and inductors, and in some design’s resistors, into a single housing to provide broadband attenuation of conducted noise.​ Compared to a single FeedThrough capacitor, it offers higher insertion loss over a wider frequency range, often extending to lower frequencies where line impedance dominates.​

Key features of FeedThrough filters include:

• Typical electrical ratings cover up to approximately 200A and AC voltages up to 250VAC, depending on the selected series.​
• Capacitance options generally range from about 10nF to 4700nF to optimise performance across different load conditions and noise spectra.​
• Designs comply with standards such as UL 60939‑3, IEC 60939‑1&2 and CSA C22.2 No. 8 for passive EMC filter components.​

FeedThrough EMC Components have a wide range of applications such as:

• RF & Communication Systems: preventing RF coupling through control and power penetrations in RF circuits, RF communication equipment, telecom base stations.​
• Power & Energy: reduce conducted emissions and improve immunity in switched‑mode power supplies, UPS systems, battery charging equipment, and electrical machines and drives.
• Aerospace & Military:  where high reliability FeedThroughs are required at bulkhead interfaces for avionics, radar, communication and mission‑critical electronics.
• Digital & Control Systems: High‑speed digital electronics, motor drives, robotics, PLC panels, as well as analogue and digital I/O lines that cross shielding boundaries.​
• EMC & Interference Protection: Broadband interference suppression for equipment needing stringent EMC compliance, including use in EMC chambers and shielded rooms.​
• Medical Devices: Implantable and external medical devices such as pacemakers and neurostimulators, where low leakage and high reliability are critical.​
• Noise Reduction in Panels: Suppression of noise on sensor, actuator, and control wiring routed near motors, inverters, and other high‑power switching elements.​
• Environmental Protection: Sealed bulkhead FeedThroughs are used to maintain environmental integrity while providing EMC filtering in harsh or outdoor conditions.​
• Networking & Communication: Where interfaces must pass through shielded enclosures without degrading EMC performance.​

EMIS aims to offer an end-to-end solution to meet industry’s ongoing EMI Challenges. With a robust global supply footprint across eight industry segments, EMIS is continuously investing in technology and skills to deliver its promise of efficiency with seamless customer support.

Customers are supported by a very experienced consulting team, a fully equipped Pre-Compliance Lab and a huge safety certified standard product offering of over 2500 part-numbers produced in their own very efficient facility.

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