LP1197NL 10/100Base-TX PoE LAN Transformer Module Single-Port

LP1197NL PoE Magnetics Specifications

The LP1197NL is a 10/100Base-TX single-port PoE LAN transformer module designed for Ethernet devices that require both reliable data transmission and Power over Ethernet (PoE) support. Built with an open-frame construction and optimized for surface-mount (SMT) assembly, LP1197NL integrates isolation transformers and filtering components to ensure signal integrity, EMI suppression, and safe power delivery over twisted-pair Ethernet cables.

Compliant with IEEE 802.3 Ethernet specifications and featuring 1500 Vrms isolation, LP1197NL is widely used in VoIP equipment, SOHO networking devices, LAN-on-Motherboard (LOM) designs, Ethernet switches, and PoE-enabled embedded systems.

Electrical Specifications (@ 25 °C)

Key Features of Power over Ethernet Transformer

• 10/100Base-TX PoE LAN magnetics module, single port
• Designed for PoE Ethernet applications
• 1:1 turns ratio for both transmitter and receiver
• Open-frame construction for compact, cost-effective designs
• Excellent signal integrity with low insertion loss and high return loss
• High common-mode noise rejection (DCMR) for improved EMI performance
• 1500 Vrms isolation voltage for safe PoE operation
• Surface-mount package, tape & reel supplied
• RoHS compliant, lead-free
• UL certified (File No. E484635)
• Supports automated SMT reflow assembly (up to 250 °C peak)

LP1197NL PoE LAN Transformer Design Advantages

Unlike standard non-PoE LAN transformers, the LP1197NL is designed to handle DC bias currents associated with PoE power delivery while maintaining stable magnetic performance. Its transformer structure minimizes core saturation, ensuring:

• Stable Ethernet link under PoE load
• Reduced packet loss and signal distortion
• Improved EMC/EMI compliance in PoE systems

This makes LP1197NL suitable for PoE-powered VoIP phones, IP cameras, access points, and embedded Ethernet devices.

PCB Layout & Assembly Notes

• Place the LP1197NL close to the Ethernet PHY to minimize trace length.
• Route TX/RX differential pairs with controlled impedance.
• Maintain adequate creepage and clearance to preserve isolation performance.
• Suitable for lead-free reflow soldering, with a maximum reflow temperature of 250 °C for 5 seconds.
• Ensure proper thermal design for PoE current handling.

Frequently Asked Questions about LP1197NL PoE Magnetics

The LP1197NL is a reliable, PoE-ready 10/100Base-TX LAN transformer module designed for compact, cost-effective Ethernet devices. With strong isolation, excellent EMI performance, and proven compliance, it is an ideal choice for VoIP, SOHO, and embedded PoE networking applications.

Q1: Is LP1197NL suitable for PoE applications?

A: Yes. LP1197NL is specifically designed for PoE Ethernet systems, supporting DC bias current while maintaining signal integrity.

Q2: What Ethernet speeds are supported?

A: LP1197NL supports 10Base-T and 100Base-TX Fast Ethernet applications.

Q3: Does this module provide sufficient isolation for PoE?

A: Yes. It provides 1500 Vrms isolation, meeting common Ethernet and PoE safety requirements.

Q4: Is the part compatible with automated SMT assembly?

A: Yes. The module is supplied in tape & reel packaging and supports standard SMT reflow processes.

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

◆ 10/100/1000/10GBase-T LAN Isolation Transformer and Filter

◆ Rj45 Modular Jack With Integrated 10/100/1000/10G Magnetics
◆ Magnetic Rj45 Jack with POE/ POE+; IEEE823.3af/ IEEE802.3at
◆ LAN Transformer With POE/ POE+; IEEE823.3af/ IEEE802.3at
◆ T1/E1,T3/DS3/E3/STS-1 Interface LAN transformer
◆ ISDN,HDSL,ADSL and VDSL Transformer and splitter

◆ Optical Transceivers