Ethernet Magnetics Component - Specifications and Parameters

Product Specifications

Technical details and manufacturing context for Ethernet Magnetics

Definition

This Ethernet magnetic component is a passive electronic part used in the network interface of an enterprise-grade VoIP desk phone. Its primary function is to provide galvanic isolation between the phone's internal circuitry and the Ethernet cable, protecting against electrical surges and transients. It also filters electromagnetic interference (EMI) and ensures proper impedance matching for reliable high-speed data transmission over twisted-pair cables. The component is constructed with a ferrite core, copper wire, epoxy resin encapsulation, and a PCB substrate. Key parameters include a 1:1 turns ratio for 10/100/1000BASE-T, insertion loss ≤1.0 dB, return loss ≥18 dB, isolation voltage 1500 V RMS, common mode rejection ≥40 dB, operating temperature -40 to 85 °C, storage temperature -40 to 125 °C, humidity ≤85% RH, DC resistance ≤1.5 Ω, inductance 350 µH, leakage inductance ≤0.5 µH, interwinding capacitance ≤30 pF, SMD package (16-pin), and footprint 12.7×10.0 mm. These values are reference ranges for directory purposes and must be verified with the legal manufacturer or supplier for the specific model and application. The component is designed for use in Ethernet interfaces and is not a standalone product; it is typically mounted on a PCB. It is not a manufacturer or seller, and this directory entry does not imply certification or compliance with any standard unless explicitly stated. Always confirm model-specific values and standards with the supplier.

Working Principle

The Ethernet magnetics operate on the principle of transformer coupling. The transformer transfers Ethernet signals between the PHY and the cable while providing galvanic isolation, preventing DC current flow and protecting against voltage spikes. Integrated common-mode chokes suppress electromagnetic interference by filtering common-mode noise, while the transformer's impedance matching ensures proper signal transfer for differential signaling. The ferrite core and copper windings are encapsulated in epoxy resin for protection and mounting on a PCB substrate.

Common Materials

Ferrite core, Copper wire, Epoxy resin encapsulation, PCB substrate

Technical Parameters

Parameter	Typical range	Notes & selection driver
Turns Ratio	1:1	Standard for 10/100/1000BASE-T
Insertion Loss	≤1.0 dB	At 1–100 MHz, affects signal integrityIEEE 802.3
Return Loss	≥18 dB	At 1–100 MHz, impedance matchingIEEE 802.3
Isolation Voltage	1500 V RMS	Withstands 60 s, safety isolationIEEE 802.3
Common Mode Rejection	≥40 dB	At 60 MHz, EMI filtering
Operating Temperature	-40–85 °C	Extended range for industrial
Storage Temperature	-40–125 °C	Non-operating
Humidity	≤85 % RH	Non-condensing
DC Resistance	≤1.5 Ω	Per winding, affects power loss
Inductance	350 µH	At 100 kHz, 100 mV, open circuit
Leakage Inductance	≤0.5 µH	At 100 kHz, affects high-frequency performance
Interwinding Capacitance	≤30 pF	Affects common mode noise
Package Type	SMD	Surface mount, 16-pin
Footprint	12.7×10.0 mm	Typical for 10/100/1000BASE-T

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

Transformer Core Part
Provides magnetic coupling for signal transfer and electrical isolation

Material: Ferrite
Primary Windings Part
Connect to the PHY chip side of the circuit

Material: Enameled copper wire
Secondary Windings Part
Connect to the RJ45 connector side of the circuit

Material: Enameled copper wire
Common Mode Choke Part
Filters electromagnetic interference and suppresses common-mode noise

Material: Ferrite bead with copper windings
Epoxy Encapsulation
Potting that holds the core and windings and makes the part surface-mountable.

Material: Epoxy resin

Manufacturers of Ethernet Magnetics

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Mianyang Sunuprise Technology Ltd

Sichuan, CN

Also makes: Balun Transformer, Common-Mode Choke, DC-DC Converter

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the purpose of Ethernet magnetics in a VoIP desk phone?

It provides galvanic isolation between the phone's internal circuitry and the Ethernet cable, protecting against surges and transients, filters EMI, and ensures impedance matching for reliable data transmission.

What are the key electrical parameters to consider?

Key parameters include turns ratio (1:1), insertion loss (≤1.0 dB), return loss (≥18 dB), isolation voltage (1500 V RMS), common mode rejection (≥40 dB), and DC resistance (≤1.5 Ω). These are reference values; verify with the supplier.

What is the operating temperature range?

The operating temperature range is -40 to 85 °C, with storage temperature -40 to 125 °C. Humidity should be ≤85% RH non-condensing.

Is this component compliant with IEEE 802.3?

The listed parameters reference IEEE 802.3 for insertion loss, return loss, and isolation voltage, but this directory entry does not guarantee compliance. Always confirm 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 (passive component)
other spec:	Isolation voltage: 1500Vrms min, Insertion loss: <1dB at 100MHz, Return loss: >16dB at 100MHz
temperature:	-40°C to +85°C (operating), -55°C to +125°C (storage)

Ethernet Magnetics

Product Specifications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards