Magnetics Module for Ethernet NICs

Product Specifications

Technical details and manufacturing context for Magnetics Module (for Ethernet NICs)

Definition

The magnetics module is a critical component in Ethernet Network Interface Cards (NICs) that serves multiple essential functions. It provides electrical isolation between the network cable and the NIC's internal circuitry, preventing ground loops and protecting sensitive electronics from voltage surges. The module performs impedance matching to ensure optimal signal transmission, filters out electromagnetic interference (EMI) and radio frequency interference (RFI), and includes transformers for signal coupling. This component is essential for maintaining signal integrity, meeting Ethernet standards compliance, and ensuring reliable network connectivity. The module typically includes pulse transformers and common-mode chokes, which together provide galvanic isolation, noise filtering, and impedance matching required for Ethernet communication protocols. Key parameters include an operating temperature range of -40 to 85 °C, isolation voltage of 1500 Vrms per IEC 60950, insertion loss of -1.0 to -0.5 dB, return loss of -18 to -10 dB, common mode rejection ratio of -40 to -30 dB, inductance of 350 to 500 µH (measured at 100 kHz, 0.1 Vrms), DC resistance of 0.5 to 1.5 Ω per winding, turns ratio of 1:1, operating humidity range of 20 to 85 %RH, storage temperature range of -40 to 125 °C, package size of 9.0 to 12.0 mm, and weight of 0.5 to 2.0 g. These values are typical reference ranges for 10/100/1000BASE-T applications and must be verified with the manufacturer for the specific model. The module is constructed with a ferrite core, copper wire, epoxy resin, and plastic housing. It is a component used in the manufacturing of computer, electronic, and optical products. Always confirm model-specific values and standards with the legal manufacturer or supplier before procurement.

Working Principle

The magnetics module operates using transformer-based isolation where the primary and secondary windings are magnetically coupled but electrically isolated. It contains pulse transformers that transfer Ethernet signals while blocking DC components and common-mode noise. The module typically includes common-mode chokes that suppress electromagnetic interference by creating impedance to common-mode signals while allowing differential-mode data signals to pass through. This combination provides galvanic isolation, noise filtering, and impedance matching required for Ethernet communication protocols.

Common Materials

Ferrite core, Copper wire, Epoxy resin, Plastic housing

Technical Parameters

Parameter	Typical range	Notes & selection driver
Operating Temperature Range	-40–85 °C	Exceeding range may degrade magnetic properties and insulation.
Isolation Voltage	1500 Vrms	Minimum for safety isolation per standard.IEC 60950
Insertion Loss	-1.0–-0.5 dB	Lower absolute value indicates better signal integrity.
Return Loss	-18–-10 dB	Higher absolute value indicates better impedance matching.
Common Mode Rejection Ratio	-40–-30 dB	Higher absolute value indicates better noise filtering.
Inductance	350–500 µH	Measured at 100 kHz, 0.1 Vrms.
DC Resistance	0.5–1.5 Ω	Per winding; lower is better for power efficiency.
Turns Ratio	1:1	Typical for 10/100/1000BASE-T.
Operating Humidity Range	20–85 %RH	Non-condensing; high humidity may cause corrosion.
Storage Temperature Range	-40–125 °C	Exceeding may cause permanent damage.
Package Size	9.0–12.0 mm	Length or width; typical for SMD packages.
Weight	0.5–2.0 g	Affects handling and PCB mechanical stress.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Pulse Transformer
Provides signal coupling and electrical isolation between network and device circuits

Material: Ferrite core with copper windings
Common Mode Choke
Suppresses electromagnetic interference by filtering common-mode noise

Material: Ferrite core with bifilar windings
Termination Resistors Part
Provides proper impedance matching for signal termination

Material: Ceramic substrate with resistive material
Protective Housing
Encapsulates and protects internal components from environmental factors

Material: Plastic or epoxy resin

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Magnetics Module (for Ethernet NICs).

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Network Interface Cards

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Manufacturers of Magnetics Module (for Ethernet NICs)

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Frequently Asked Questions

What is the primary function of a magnetics module in an Ethernet NIC?

It provides electrical isolation, impedance matching, and noise filtering to ensure signal integrity and reliable network connectivity.

What isolation voltage is typical for these modules?

A typical reference value is 1500 Vrms, as per IEC 60950, but you must verify the specific model's rating with the manufacturer.

What materials are commonly used in construction?

Common materials include ferrite core, copper wire, epoxy resin, and plastic housing.

How should I verify the specifications for my application?

Always check the datasheet and confirm model-specific values and standards with the legal manufacturer or supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Not applicable (solid-state component)
other spec:	Operating frequency: 10/100/1000 Mbps Ethernet standards
temperature:	-40°C to +85°C

Magnetics Module (for Ethernet NICs)

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards