LFE8657 Single Port 10/100Base-T SMT Ethernet Transformer Module

LFE8657 10/100Base-T TransformerOverview

The LFE8657 is a premium-grade, single-port Discrete Magnetic Ethernet Transformer designed and manufactured by LINK-PP. Engineered for 10/100Base-T (Fast Ethernet) physical layer (PHY) applications, this surface-mount (SMT) component seamlessly integrates isolation transformers and common-mode chokes into a compact 16-pin footprint.

Serving as a highly reliable interface between the PHY transceiver and the RJ45 connector, the LFE8657 ensures exceptional signal integrity while providing critical 1500Vrms electrical isolation. It is an industry-standard component, widely recognized as a direct drop-in replacement (cross-reference) for other mainstream 10/100M magnetics, making it an ideal choice for hardware designers and procurement managers looking to optimize their BOM (Bill of Materials) without compromising on quality.

Key Features

1. Superior Signal Integrity & Electrical Performance

• Standardized Magnetics: Features a 1CT:1CT turns ratio on both TX and RX channels, delivering a minimum Open Circuit Inductance (OCL) of 350µH with 8mA DC bias. This ensures perfect impedance matching and compatibility with leading Fast Ethernet PHY ICs (e.g., Realtek, Microchip, TI).
• Robust Isolation Protection: Provides up to 1500 Vrms HiPot isolation, safeguarding sensitive downstream ICs against lightning surges, ground loops, and electrostatic discharge (ESD).
• Excellent EMI Mitigation: Integrated common-mode chokes deliver a minimum of -30dB Common Mode Rejection Ratio (CMRR), effectively filtering out high-frequency noise and ensuring low bit-error rates over long cable runs.

2. Optimized for SMT Manufacturing

• Automated Assembly Ready: Packaged in standard Tape & Reel (T&R), the 16-pin SMT design is fully optimized for high-speed pick-and-place machines, significantly boosting production throughput for EMS (Electronic Manufacturing Services) providers.
• Thermal Stability: The UL 94V-0 rated thermoplastic housing is designed to withstand standard lead-free reflow soldering profiles without deformation or performance degradation.

3. Supply Chain Security & Compliance

• Global Certifications: Fully compliant with RoHS and REACH environmental directives, and manufactured in ISO-certified facilities, ensuring your end-products meet global market entry requirements.
• Cost-Effective Cross-Reference: Functions as a highly reliable, cost-effective alternative to standard 10/100M transformers, offering stable lead times and extensive factory stock.

Technical Specifications

1. General & Packaging Parameters

2. Electrical & Magnetic Characteristics (@ 25°C)

LFE8657 SMT Magnetic Transformer Drawing