EMI Filters
EMI filtering solutions available in surface mount, panel mount, discoidal and planar array form factors.
Featured Surface Mount EMI Filters
Surface Mount EMI Filters are designed to suppress electromagnetic interference directly at the circuit level, helping engineers achieve reliable signal integrity and regulatory compliance in compact electronic designs. These filters effectively reduce high-frequency noise. Their compact form, wide electrical ratings and robust construction make them well suited for demanding applications across automove, industrial, medical, and aerospace and defense environments.
Key Highlights:
- Low-Inductance EMI Suppression: effective high-frequency noise reduction for signal and power lines.
- Compact Surface‑Mount Design: Ideal for high‑density PCBs and automated assembly.
- Broad Ratings & Reliability: Wide voltage, current, and temperature options for demanding environments.
- Robust Construction: Enhanced mechanical durability for thermal cycling and board flex.
Featured Panel Mount EMI Filters
Panel mount EMI filters provide high-performance electromagnetic interference suppression for power and signal lines that pass through enclosures, chassis, and equipment interfaces. By mounting directly to panels or bulkheads, these filters deliver superior noise attenuation while helping isolate sensitive electronics from external interference in rugged operating environments.
Key Highlights:
- Feedthrough EMI Filtering: Noise suppression at enclosure entry and exit points.
- High-performance Attenuation: Effective EMI reduction across wide frequency ranges.
- Rugged Panel Mount Design: Metal bodies with sealed construction for harsh environments.
- Power & Signal Support: Configurations for both signal-level and power-line filtering.
Featured Planars and Discoidals
Planars and Discoidals are multilayer ceramic capacitors engineered for EMI filtering in high-reliability connector, bulkhead, and multi-way interface applications. Derived from proven feedthrough and planar capacitor architectures, these components deliver robust EMI suppression while maintaining mechanical precision and electrical stability in demanding environments.
Key Highlights:
- High-Reliability EMI Filtering: Designed for filtered connectors and bulkhead interfaces.
- Discoidal RF Performance: Low impedance ground paths enable wide-band EMI suppression.
- Planar Array Filtering: Multi-line EMI control within compact connector assemblies; planar arrays provide distributed capacitance between multiple signal lines and ground.
- Precision Ceramic Manufacturing: Tight tolerances for stable electrical and mechanical performance.
- Mission-Critical Proven: Trusted in aerospace, defense, space and industrial systems.
Educational Resources
Knowles Introduces the SFSW Series of Hermetic, Panel-Mount EMI Filters
The Role of EMI Filters in Power Electronics
Your Guide to Selecting Safety Capacitors for EMI Filtering in the PFC Stage of an AC/DC Converter
What Are EMI Filters?
Overcoming EMI in Electric Vehicle Applications
Continuing Our Investment in Surface-Mount EMI Filters
Capacitor Assemblies for Power and RF Applications
What are EMI Filters?
Knowles 2025
Product Documentation
Capacitors for RF Power in Semiconductor Manufacturing
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