INDUSTRY COMPONENT

Secondary Windings

Secondary windings are electromagnetic coils in Ethernet magnetics that provide signal isolation and impedance matching for network communication.

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Component Specifications

Definition
Secondary windings in Ethernet magnetics are precisely wound conductive coils that form part of a transformer or common-mode choke. They function to transfer electrical signals between isolated circuits while providing electromagnetic interference (EMI) suppression and impedance matching required for reliable high-speed data transmission in Ethernet networks. These windings are typically designed with specific turn ratios and winding configurations to meet IEEE 802.3 standards for Ethernet communication.
Working Principle
Secondary windings operate on electromagnetic induction principles. When alternating current flows through the primary winding, it creates a varying magnetic field that induces a proportional voltage in the secondary winding. This provides galvanic isolation between network devices while maintaining signal integrity. The winding design ensures proper impedance matching (typically 100Ω differential) and common-mode noise rejection for Ethernet signals.
Materials
Copper magnet wire (typically 38-44 AWG) with polyurethane or polyamide-imide insulation, wound on ferrite cores (Mn-Zn or Ni-Zn compositions). Termination materials include tin-plated copper alloy leads or solderable pads.
Technical Parameters
  • Impedance 100Ω differential
  • Inductance 350μH minimum
  • Turn Ratio 1:1 or 1:1.5 typical
  • DC Resistance 0.2-0.5Ω typical
  • Frequency Range 1-100MHz
  • Isolation Voltage 1500V RMS minimum
Standards
ISO 11801, IEC 60950-1, IEEE 802.3, UL 60950

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Secondary Windings.

Ethernet transformer winding network magnetics signal isolation coil impedance matching winding EMI suppression coil LAN transformer component Secondary Windings Secondary Windings in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Ethernet Magnetics

Passive electronic component that provides electrical isolation, signal conditioning, and EMI filtering for Ethernet interfaces

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Engineering Analysis

Risks & Mitigation
  • Insulation breakdown due to voltage spikes
  • Impedance mismatch causing signal reflection
  • Saturation from DC bias currents
  • Thermal degradation from prolonged operation
FMEA Triads
Trigger: Insufficient insulation between winding layers
Failure: Short circuit between turns leading to signal loss
Mitigation: Implement automated optical inspection during manufacturing and 100% Hi-pot testing
Trigger: Improper winding tension during manufacturing
Failure: Variation in inductance values affecting impedance matching
Mitigation: Use servo-controlled winding machines with tension feedback systems

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Inductance ±20%, DC resistance ±10%, impedance ±15%
Test Method
LCR meter measurements at 1MHz, Hi-pot testing at 1500VAC for 60 seconds, network analyzer impedance verification

Buyer Feedback

★★★★☆ 4.9 / 5.0 (19 reviews)

"The technical documentation for this Secondary Windings is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Secondary Windings so far."

"Testing the Secondary Windings now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

What is the purpose of secondary windings in Ethernet magnetics?

Secondary windings provide electrical isolation between network devices, prevent ground loops, suppress electromagnetic interference, and ensure proper impedance matching for reliable data transmission.

How do secondary windings differ from primary windings in Ethernet magnetics?

While both windings share similar construction, secondary windings are on the isolated side of the transformer and are designed with specific turn ratios and winding configurations to provide the required isolation and impedance characteristics for the connected network equipment.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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