Capacitors
Knowles delivers a broad portfolio of high‑performance capacitors—including ceramic, film, aluminum, trimmer, supercapacitors, and EMI filters—engineered for the world’s most demanding applications and customizable to meet unique design requirements.
Featured Ceramic Capacitors
High performance ceramic capacitors designed to meet the needs of the world's most demanding applications.
Key Highlights:
- Wide voltage coverage (25V-6kV) and capacitance options from <1pF to >1µF to support diverse circuit requirements.
- Stable performance in harsh environments with high-temperature, High-reliability, and AEC-Q200 qualified constructions.
- Ultra low loss High Q dielectrics and low ESR designs that minimize power dissipation in EF, resonant, and high-frequency applications.
- Safety-certified X1/X2/Y2 MLCCs and robust termination systems (including FlexiCap and non-magnetic copper-barrier options) for EMI, isolation, and mechanically demanding designs.
- Non-magnetic, pulse-capable, and specialty ceramic options that ensure signal integrity and fail-safe operation.
Featured Trimmer Capacitors
Precision trimmer capacitors using air, glass, sapphire, and PTFE dielectrics
Key Highlights:
- Multi-turn and half/single-turn options for flexible tuning.
- Fine to rapid adjustment for precise, repeatable calibration.
- Broad RF tuning range from 1MHz to 2+ GHz.
- High-voltage capability up to 20,000VDC.
- High-Q materials (glass, quartz, sapphire) with capacitance ranges up to 330pF.
- Low-loss, high-stability performance for RF and microwave circuits.
- Multiple mounting styles including bulkhead, through-hole, and surface-mount for easy integration.
Featured Aluminum Capacitors
Custom screw terminal, snap-in and board mount capacitors, including the innovative Flatpack series for ruggedized applications and space savings.
Key Highlights:
- Multiple mounting styles (screw-terminal, snap-in, board-mount) for flexible integration.
- High energy storage for bulk filtering in critical systems.
- Rugged Flatpack options for harsh, space-constrained environments.
- Customizable designs for tailored electrical and mechanical performance.
- Proven across high-reliability applications for long-life energy buffering and filtering.
Featured Film Capacitors
A broad line of AC and DC rated film capacitors using industry leading dielectric materials.
Key Highlights:
- Broad AC/DC ratings with advanced dielectric materials for stable performance across demanding applications.
- Self-healing metallized film construction extends life and prevents catastrophic failure.
- Handles high ripple current and transients for reliable operation in power electronics.
- Application-specific designs for DC link, snubber, harmonic filtering, and pulse applications.
- Dry and fluid-filled options with built-in safety features for high-power, compliance-critical systems.
Featured Mica Capacitors
Knowles Cornell Dubilier’s mica capacitors deliver stable, high-frequency performance with low loss and high insulation resistance across a wide temperature range.
Key Highlights:
- High-frequency stability with high-Q performance, minimizing signal distortion.
- Low-loss operation with ultra-low ESR for improved efficiency in RF and tuned circuits.
- High insulation resistance ensures reliability across wide temperature ranges.
- Available in COTS and military-grade options for proven, mission-critical performance.
- Resistant to aging and performance drift, delivering long-term capacitance stability.
Featured Rechargeable Batteries
Knowles' Cornell Dubilier brand of rechargeable lithium-ion batteries use advanced encapsulation to maximize energy density and reliability in compact form factors.
Key Highlights:
- Advanced encapsulation maximizes usable space, increasing energy density within the cell.
- Higher energy density delivers more runtime and power in the same compact footprint.
- Enhanced reliability and longevity with improved construction stability.
- Compact designs for space-constrained electronics, ideal for portable and embedded devices.
- Consistent performance across charge cycles, ensuring stable, repeatable energy delivery.
Featured Supercapacitors
Available in a comprehensive range of capacitance values and voltages.
Key Highlights:
- Wide capacitance and voltage range for versatile power‑management applications.
- Ultra‑high capacitance enables fast charge and discharge for immediate energy needs.
- Exceptionally high energy density compared to traditional capacitors.
- Flexible form factors and voltage options for easy PCB or system‑level integration.
- Reliable performance across many applications, from backup power to energy stabilization.
Educational Resources
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Fundamental Capacitor Functions in the World of Electronics
When considering capacitor selection for a given circuit, whether you’re focused on power electronics or deep in the world of RF, it's important to remember that some of a capacitor’s fundamental roles are universal.
Common Capacitors in Solar Power Conversion Systems
Ongoing innovation in solar power electronics and rising interest in photovoltaic (PV) installations underscores the importance of robust and efficient electronic components. Capacitors play a key role in power conversion systems as they function to smooth and regulate power flow, protect against voltage surges and filter unwanted signals.
Supercapacitors: A Key Technology for Driving Modern Logistics
As consumers demand rapid, and accurate, delivery of online orders, yet labor shortages continue to prevail, distributors need to increase efficiency and productivity, reduce errors, and improve inventory management in their warehouses.
Knowles Achieves a Benchmark for Excellence: MIL-PRF-55681-Qualified Capacitors for Mission-Critical Defense Applications
When it comes to aerospace and defense applications, every single component plays a role in the success and longevity of the system. Capacitors are vital in flight control systems, radar systems, signal intelligence equipment and more.
Powering Artificial Intelligence with Low-Loss Capacitors
In a short period of time, artificial intelligence (AI) large language models (LLMs) like ChatGTP and Claude have made leaps and bounds in terms of their size and sophistication.
Specifying Capacitors for High-Energy Pulse Applications
Energy storage capacitor banks supply pulsed power in all manner of high-current applications, including shockless compression and fusion.
MLC Capacitors Catalog
A comprehensive portfolio of high-performance MLCCs.
AEC-Q200: Automotive Grade Capacitor Catalog
Automotive‑grade passive components qualified to AEC‑Q200 standards.
Trimmers and Non-Magnetic Components
A comprehensive catalog of high‑quality, precision trimmers.
Capacitor Assemblies for Power and RF Applications
Custom capacitor assemblies optimized for high‑performance power and RF applications.
High Precision and High Reliability Machined and Plated Solutions
Experience the benefits of our all-inclusive manufacturing complex.
Power Conversion Capacitors for Harsh Environments
Examine how growing outdoor power conversion applications are increasing performance demands.
High-Performance Filters in Millimeter Wave Applications
Learn about mmWave filter characteristics and technology.
MLCCs for Medical Implantable Devices
What it takes for MLCCs to meet the high-reliability requirements of medical implantable devices.
Knowles Safety Capacitors
A broad portfolio of safety-certified capacitors designed to protect people and equipment, even in demanding applications.
Knowles MD Series
Designed for implantable medical applications, the Knowles MD Series delivers dependable, long‑lasting capacitor performance...
Supporting World-Wide Electric Vehicle Innovation
As EV adoption accelerates, Knowles supports next‑generation vehicles and charging infrastructure with AEC‑Q200‑qualified, h...
Product Documentation
Non-Magnetic, High Power RF Capacitors and Trimmers
From MRI to low-PIM systems, Knowles delivers precision non-magnetic components.
Capacitors for RF Power in Semiconductor Manufacturing
RF power capacitors engineered to deliver the stability and reliability that next-generation systems demand.
Supercapacitor Module Capabilities
Supercapacitor solutions tailored to meet unique application requirements with advanced design flexibility.
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