alfatec GmbH & Co. KG
Home Products Passive Components Magnetics Wire Wound Chip Beads

Wire-Wound Chip Beads: High Current, Superior EMI Performance

Electromagnetic compatibility (EMC) is critical for reliability and performance of electronic assemblies. 

Unwanted high-frequency noise can interfere with the operation of sensitive circuits. Wire-wound chip beads - also known as wire-wound SMD chip beads - suppress such interferences. 

alfatec GmbH & Co. KG offers these components from the manufacturer Sunlord, providing reliable solutions for EMI filtering. 

What Are Wire-Wound Chip Beads?

Wire-wound chip beads are passive SMD (Surface Mount Device) components primarily used to suppress high-frequency noise on power- or signal-lines. They belong to the family of inductors or chokes. 

Around a ferrite core, a fine wire is wound. This construction distinguishes them from multilayer chip beads, which are manufactured using LTCC (Low Temperature Co-fired Ceramic) technology. The wire-wound structure enables specific electrical characteristics suited for demanding applications. 

Functionality: A chip bead acts as a frequency-dependent resistor (impedance). At low frequencies (e.g., DC or signal frequencies), it presents very low resistance and has minimal impact on the signal. At high frequencies (noise), its impedance increases sharply, effectively attenuating the noise and converting it into heat, while allowing the desired signal to pass through largely unaffected. 

Already know what you're looking for?

Click here to go directly to our selection and data sheets for product series in the wire-wound chip beads section.

To the series search
Advantages and Features of Wire-Wound Chip Beads
High Current Capability: Ideal for power line filtering and DC/DC converters due to their robust construction.
Low DCR: Minimizes power loss and voltage drop, improving energy efficiency.
Sharp Impedance Curve: Often steeper than multilayer types, enabling more effective filtering in defined frequency ranges.
Stable Performance: Less prone to saturation effects at high currents.
Wide Frequency Range: Effective attenuation across a broad spectrum of noise frequencies.
Application Areas
Power Line Filtering: Suppression of noise from switching regulators (DC/DC converters), power supplies.
Signal Line Filtering: Protection of sensitive signal lines such as clocks and data buses.
Interface Filtering: EMI suppression for USB, HDMI, Ethernet, and other interfaces.
Automotive Electronics: ECUs, infotainment systems, sensors, powertrain—where high reliability is essential.
Industrial Electronics: Control systems, measurement technology, automation.
Consumer Electronics: Smartphones, tablets, laptops, TVs, gaming consoles.
Telecommunications: Base stations, routers, network equipment.

Technical Parameters and Materials

alfatec offers wire-wound chip beads from Sunlord, known for their quality and performance. Key technical parameters include:

  • Impedance (Z) @ Frequency: Measured in ohms (Ω), typically at 100 MHz. Indicates how effectively the bead attenuates high-frequency signals. Sunlord offers beads with impedance values ranging from a few ohms to several kilo-ohms.
  • Rated Current (IR): The maximum continuous DC current the bead can handle without damage or significant performance degradation. Wire-wound beads typically support higher currents than multilayer types, making them ideal for high-current applications.
  • DC Resistance (DCR): The ohmic resistance of the winding, measured in ohms or milliohms. A low DCR minimizes voltage drop and power loss—especially important in power lines.
  • Self-Resonant Frequency (SRF): The frequency at which the parasitic capacitance of the winding resonates with its inductance. Above this frequency, the bead behaves capacitively, reducing its filtering effectiveness. 

Materials: 

  • Core: High-quality ferrite materials optimized for specific frequency ranges and performance.
  • Winding: Enamel-coated copper wire.
  • Terminals: Tin-plated for reliable soldering in SMD processes. 

Sunlord attaches great importance to material quality and precise manufacturing processes in order to ensure consistent electrical properties and high reliability of its inductors.

Our partner in the field of wire wound chip beads

Logo Sunlord

Sunlord

Our partner Sunlord has been developing and producing chip-based electronic components such as EMC or RF components, coils, inductors and transformers since 2000. The company also offers development work for customised designs and has already received Tier 1 certifications for this. 

 

Go to the manufacturer

Sunlord-Specific Advantages:

  • High Reliability & Quality: Known for strict quality control and automotive-qualified product lines. 
  • Broad Portfolio: Wide range of sizes, impedance values, and current ratings. 
  • Innovative Materials: Use of optimized ferrite materials for maximum performance. 

Your Partner for Sunlord Chip Beads: alfatec GmbH & Co. KG

alfatec is your trusted partner for high-quality electronic components, including wire-wound chip beads from Sunlord. We understand the technical needs of engineers and support procurement teams with efficient sourcing processes. 

Why alfatec? 

  • Technical Expertise: We help you select the right chokes, inductors, and filter components.
  • Broad Portfolio & Availability: Direct access to Sunlord’s extensive product range.
  • Fast Delivery: Efficient logistics to meet your project timelines.
  • Attractive Pricing: Competitive conditions for your cost planning. 

 

Request your personalized quote now

See for yourself the quality and performance of our wire-wound chip beads. Request a non-binding quote today or download the data sheets.

alfatec – your partner for high-quality electronic components

As your expert partner for electronic components, alfatec supports you in selecting the right wire-wound chip beads for your applications. We offer comprehensive advice and are happy to answer any questions you may have about power modules.

Do you have questions about our wire-wound chip beads or would you like a personal consultation? Feel free to contact us.