LP72431ANL 10GBASE-T Transformer Module for PoE++ IEEE 802.3bt

Applications & Compliance of LP72431ANL 10GBASE-T Transformer Module

Primary Applications

• 10GBASE-T Ethernet systems
• PoE++ Power Sourcing Equipment (PSE)
• Powered Devices (PD)
• SOHO devices (e.g., ADSL modems)
• LAN-on-Motherboard (LOM)
• Ethernet hubs and switches
• Enterprise and industrial networking equipment

Standards & Certifications

• Compliant with IEEE 802.3bt (PoE++)
• UL Certified – File No. E484653
• RoHS Compliant

LP72431ANL Mechanical & Environmental Characteristics

Electrical Specifications (@25°C)

1. Turns Ratio

Balanced center-tapped configuration ensures proper impedance matching between PHY and cable side.

2. Open Circuit Inductance (OCL)

Optimized for high-frequency 10G transmission while supporting PoE++ DC bias conditions.

3. DC Current Capability

Designed for PoE++ high-power delivery requirements.

4. Hi-Pot Isolation

Provides reinforced insulation between primary and secondary circuits.

5. Insertion Loss

Low insertion loss supports stable 10GBASE-T eye diagram performance across extended frequency bands.

6. Return Loss (Minimum)

Ensures proper impedance matching and minimized signal reflection.

7. Crosstalk

8. Differential to Common Mode Rejection

Effective suppression of EMI and common-mode noise in high-speed Ethernet environments.

LP72431ANL 10GBASE-T PoE++ Transformer Module Datasheet

Key Engineering Advantages of LP72431ANL 10G PoE++ Transformer

• Optimized for 10GBASE-T high-frequency performance
• Supports 1000mA continuous DC current for PoE++
• 1500Vrms isolation for enhanced safety
• Industrial temperature range (-40°C to +85°C)
• Compact 24-pin SMD package
• Designed for automated assembly (Tape & Reel)

Summary of SMT 10G LAN Transformer

LP72431ANL is a 10GBASE-T PoE++ transformer module combining:

• High-frequency signal integrity (1–500MHz)
• Strong EMI suppression
• High-current handling capability
• Industrial temperature reliability
• IEEE 802.3bt compliance

It is ideal for next-generation 10G Ethernet switches, industrial PoE++ equipment, and high-performance network infrastructure requiring stable data transmission and high-power delivery.

LP72431ANL 10G PoE++ LAN Magnetics FAQs

1. What is LP72431ANL and what applications is it designed for?

Answer:
LP72431ANL is a 10GBASE-T PoE++ LAN magnetics transformer module designed for high-speed Ethernet with enhanced power delivery. It is engineered to support IEEE 802.3bt (PoE++) applications, where both 10G data transmission and high DC current capability are required. Typical applications include enterprise switches, PoE++ power sourcing equipment (PSE), powered devices (PD), and high-performance networking systems.

2. What makes LP72431ANL suitable for PoE++ applications?

Answer:
LP72431ANL features a high DC current handling capability of 1000mA continuous @57VDC, reinforced isolation (1500 Vrms), and optimized high-frequency magnetics. These characteristics ensure it can reliably operate under PoE++ power loads while maintaining stable 10G signal integrity across the LAN link.

3. Is LP72431ANL compliant with industry standards?

Answer:
Yes. LP72431ANL is fully compliant with IEEE 802.3bt, the standard that defines PoE++ requirements for both power delivery and Ethernet signaling performance. It carries UL Certification (File No. E484653) and meets RoHS environmental compliance.

4. What is the turns ratio of this transformer?

Answer:
The LP72431ANL transformer features a 1CT : 1CT ± 5% center-tapped turns ratio for all channels. This balanced configuration ensures proper impedance matching between Ethernet PHY and cable, which is crucial for maintaining 10GBASE-T link performance.

5. What electrical performance can be expected at high frequency?

Answer:
LP72431ANL is engineered for wide-band signal support from 1 MHz up to 500 MHz, including low insertion loss and controlled return loss that help preserve signal integrity for 10G applications:

• Insertion Loss: upto -3.0 dB (400–500 MHz)
• Return Loss: ≥ -18 dB in key frequency bands
• Crosstalk: typical -25 dB
• CMRR: typical -20 dB

These specifications support robust 10GBASE-T transmission performance and low EMI.

6. Can LP72431ANL operate in industrial environments?

Answer:
Yes. LP72431ANL has a wide operating temperature range of -40°C to +85°C, making it suitable for industrial networking equipment, outdoor enclosures, and thermally demanding applications. The module also withstands standard surface-mount reflow conditions up to 250°C for 5 seconds.

7. What mechanical package does LP72431ANL use?

Answer:
LP72431ANL comes in a 24-pin Surface Mount Device (SMD) package typically supplied in Tape & Reel for automated assembly. The compact package measurably reduces board footprint while providing robust mechanical stability.

8. How does LP72431ANL handle interference and noise suppression?

Answer:
LP72431ANL includes integrated magnetics optimized for differential signaling and common-mode noise rejection. Its design delivers effective suppression of common-mode noise and crosstalk, reducing EMI and improving bit-error performance in high-speed 10G environments.

9. Is LP72431ANL suitable for smart home and SOHO applications?

Answer:
Yes, LP72431ANL is suitable for SOHO (Small Office/Home Office) devices such as ADSL modems or integrated LAN ports. However, its high-current capability and industrial temperature range make it especially valuable in enterprise and industrial PoE++ systems where performance and reliability are critical.

10. How should designers validate LP72431ANL in their system?

Answer:
Design engineers should validate LP72431ANL as part of their Ethernet PHY, magnetics, and layout co-design. Important checks include:

• Signal integrity measurements (eye diagram, S-parameters)
• DC bias handling under PoE++ load
• Return loss and insertion loss across key frequency bands
• Isolation and dielectric withstand testing

Combining these evaluations ensures optimal system performance and compliance.

11. What is the advantage of integrated AutoMDX?

Answer:
The AutoMDX capability simplifies network interface connectivity by automatically detecting and configuring appropriate transmit/receive pairs. This avoids manual crossover wiring and enhances system flexibility.

12. Where can I find the full datasheet and PCB footprint?

Answer:
The complete datasheet with electrical specifications, pin assignments, recommended PCB layout, and mechanical drawings is available on the LINK-PP official website or by contacting authorized distributors. For technical support, please reach out to LINK-PP sales or engineering representatives.