749010012A 10/100BASE-TX Ethernet Transformer 1500Vrms Isolation

Ethernet Magnetic Transformers Description:

10/100BASE-T Single-Port SMT LAN Magnetics Module – 350µH, 1:1 Ratio, 1500Vrms Isolation

The 11FB-05NL is a compact 10/100BASE-T Ethernet isolation transformer designed for Fast Ethernet PHY interfaces, offering excellent signal integrity, EMI suppression, and electrical isolation.

With 350µH OCL, 1:1 turns ratio, and 1500Vrms isolation, this SMD-16P LAN magnetics module provides a reliable and space-efficient solution for Ethernet switches, routers, IP cameras, and embedded networking systems.

Key Features & Advantages

• Fully compliant with IEEE 802.3u (10/100BASE-TX)
• High OCL: 350µH min @100kHz, 8mA bias
• 1:1 turns ratio optimized for standard Ethernet PHY coupling
• 1500Vrms isolation voltage for enhanced safety and EMC performance
• Compact SMD-16P package for high-density PCB layouts
• Auto-MDIX capable
• Excellent insertion loss, return loss, and crosstalk performance
• RoHS compliant, lead-free process
• Operating temperature: 0°C to +70°C (commercial grade)

749010012A SMT LAN transformer General Specifications:

749010012A Datasheet:

LP1102NL.pdf

Recommended PCB Layout Guidelines

• Place the transformer close to the Ethernet PHY
• Use 100Ω differential impedance controlled routing
• Keep TX/RX differential traces short and symmetrical
• Implement solid reference ground planes
• Ensure proper chassis grounding for EMI shielding

Engineering Design Benefits of 10/100Base-T Transformers: 

✔ Simplified Ethernet Interface Design

Integrated magnetics eliminate discrete transformer design, reducing BOM count, PCB routing complexity, and development risk.

✔ Improved Signal Integrity & EMC Compliance

High OCL and optimized winding structure ensure excellent impedance matching, reduced reflections, and superior EMI suppression.

✔ Enhanced Electrical Safety

1500Vrms isolation protects sensitive PHY circuits, supporting regulatory compliance and long-term system reliability.

✔ Optimized for High-Volume SMT Assembly

SMD-16P packaging supports automated pick-and-place assembly, improving manufacturing yield and cost efficiency.

Electrical Characteristics (Typical @25°C) :

Applications of Ethernet Transformers:

• Ethernet Switches & Routers
• IP Cameras
• Network Interface Cards (NIC)
• Industrial Ethernet Devices
• Embedded IoT Gateways
• Smart Home Networking Equipment
• Access Points (AP)
• Communication Control Boards

NOTES:

1. Designed to support applications, such as SOHO(ADSL modems), LAN-on-Motherboard(LOM), hub and Switches.

2. Meets IEEE 802.3 Specification.

3. Maximum reflow temperature is 250℃ Max, 5 Sec.

4. UL Certification: file number: E484635.