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:
| Parameter | Specification |
| Part Number | 11FB-05NL |
| Transformer Type | LAN Isolation Transformer |
| Ethernet Standard | 10/100BASE-TX |
| Data Rate | 10 / 100 Mbps |
| Number of Ports | Single Port |
| Turns Ratio | 1 : 1 |
| OCL (Inductance) | 350 µH min |
| Isolation Voltage | 1500 Vrms, 1 min |
| Package Type | SMD-16P |
| Mounting Type | Surface Mount (SMT) |
| Dimensions (L × W × H) | 12.70 × 8.80 × 6.35 mm |
| Operating Temperature | 0°C to +70°C |
| Auto MDIX | Yes |
| RoHS Compliance | Yes |
| Moisture Sensitivity Level | MSL 1 |
| Packaging | Tape & Reel |
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) :
| Parameter | Condition | Value |
| Turns Ratio | Primary : Secondary | 1 : 1 |
| OCL | 100kHz, 100mV, 8mA bias | ≥ 350 µH |
| Insertion Loss | 1–100 MHz | ≤ -1.0 dB |
| Return Loss | 1–30 MHz | ≥ -18 dB |
| Crosstalk | 1–100 MHz | ≥ -35 dB |
| Common Mode Rejection (CMR) | 1–100 MHz | ≥ -35 dB |
| Isolation Voltage | 60 seconds | 1500 Vrms |
| Operating Temperature | — | 0°C ~ +70°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.
Product Tags:
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749010012A 10/100BASE-TX Ethernet Transformer 1500Vrms Isolation Images
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