Providing high frequency noise suppression and improved system EMI performance.
A range of FeedThrough components from EMIS, are 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 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: 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.
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