HF-84023 10/100 BASE-TX Surface Mount LAN Magnetics Quad-Port

Product Overview

The HF-84023 is a quad-port, surface-mount magnetics module designed for 10/100 BASE-TX Ethernet applications. It integrates the required isolation, coupling, and filtering magnetics in a compact SMT package, tailored for space-efficient PCB design in Ethernet modules, switches, or network interface devices.
Typical target applications include LAN switching hubs, network interface cards (NICs), embedded Ethernet motherboards, and other 10/100 Mbps systems requiring multiple RJ-45 ports.

Key Features

• Supports 10/100 Mbps BASE-TX Ethernet standard.
• Quad-port configuration (4 independent magnetics ports) — helps reduce board space and simplify BOM for multi-port Ethernet devices.
• Surface-mount technology (SMT) footprint — designed for automated assembly and compact design.
• Integrated magnetics module: typically includes transformer windings, common-mode chokes, isolation, and termination components (as is common in 10/100 magnetics modules).
• Suitable for high-density multi-port Ethernet applications thanks to its compact packaging.
• Complies with typical Ethernet magnetics isolation and performance requirements

Typical Benefits for Designers

• Confirm network speed requirement: If your system requires Gigabit (1000 Base-T) or higher, select accordingly; LP1188NL is optimized for 10/100 Base-T.
• Ensure the PCB layout accommodates transformer placement near the PHY or RJ45 magnetics path for optimal signal integrity.
• Consider the isolation voltage rating relative to the system safety/regulatory environment.
• Verify the suitability of the reflow profile (SMT) and the maximum component height, considering enclosure constraints.
• If PoE (Power-over-Ethernet) capability is required, ensure magnetics and RJ45 interface are rated accordingly (LP1188NL is for NON-PoE).

Typical Design/Board Layout Considerations

1. Ensure correct footprint and pad layout per the module’s mechanical drawing (refer to datasheet for pin-out and solder-pad dimensions).
2. Maintain correct isolation clearance around the magnetics to meet Ethernet isolation standards (typically 1500 Vrms or higher between windings).
3. Route differential pairs (Tx/Rx) in close proximity, controlled impedance, and maintain return path integrity to maximize signal integrity at 100 Mbps.
4. Consider placement relative to the RJ-45 connector: the magnetics are often placed immediately adjacent to the RJ-45 to minimize stub length and EMI.
5. Follow manufacturer’s recommendation for grounding/shielding: typically, the magnetics module shielding or drain pin should connect to chassis ground or signal ground as specified.
6. EMI/EMC: Use of integrated magnetics helps meet emissions/privacy specifications; still, layout must follow good practices (e.g., keep noisy switching away, maintain common-mode choke effectiveness, use proper decoupling).
7. Thermal & reliability: Although magnetics modules generally carry low losses, verify that ambient temperature, board reflow profile, and any nearby heat sources are considered (especially in dense, multi-port designs).

LINK-PP is a professional designer and Manufacturer of magnetic telecom and networking components. Founded in Shenzhen in 1997 and began to develop Discrete Transformer. With over 26 years of experience in innovation and technology leadership. Our main products include RJ45 Connectors, LAN Transformers, and SFP Modules. We focus on improving product reliability and durability.

Main Production Lines

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