S16037G 10/100Base‑T SMD-16P Ethernet Transformer Module 350µH OCL

 
S16037G is a 10/100Base-T SMD Ethernet transformer with 350µH OCL, 1:1 turns ratio, 1.5kVrms isolation, RoHS compliant. Ideal for Fast Ethernet designs.
 

S16037G LAN Transformer Overview

 
The S16037G is a compact 10/100Base‑T LAN magnetic transformer module designed for Fast Ethernet isolation and signal conditioning. It integrates transmit (TX) and receive (RX) magnetics in a 1:1 turns ratio, meeting IEEE 802.3 / 802.3u requirements for 10BASE‑T and 100BASE‑TX applications.
 
With 350 µH minimum OCL at 8 mA bias, low insertion loss, and robust 1.5 kVrms Hi‑Pot isolation, S16037G ensures stable data transmission, improved EMI performance, and long‑term reliability in space‑constrained designs. The device is supplied in a 16‑pin SMD package (12.8 × 6.9 mm) and is fully RoHS & halogen‑free compliant.
 

Key Features of S16037G 10/100Base‑T SMD Transformer

• Supports 10/100Base‑T Ethernet (IEEE 802.3 / 802.3u)
• 1:1 TX/RX turns ratio for balanced signal coupling
• 350 µH minimum OCL @ 100 kHz, 0.1 V, with 8 mA DC bias
• Low insertion loss: −1.15 dB max (0.3–100 MHz)
• High isolation voltage: 1500 Vrms Hi‑Pot
• Compact SMD‑16P package for automated assembly
• RoHS & halogen‑free compliant

Electrical Specifications (@ 25 °C)

S16037G SMD-16P Ethernet Magnetic Module Datasheet

S16037G Datasheet-SCHEMATICS

S16037G Datasheet-Mechanicals

Signal Integrity Performance

Return Loss (dB Min)

Crosstalk (dB Min)

DCMR-Differential-to-Common Mode Rejection (dB Min)

 Mechanical Specifications of S16037G LAN Transformer

Environmental & Compliance

• Operating Temperature: 0 °C to +70 °C
• Storage Temperature: −0 °C to +85 °C
• Compliance: RoHS, Halogen‑Free

10/100Base‑T LAN Transformer Standards & Design Notes

1. Designed to meet IEEE 802.3 / 802.3u Fast Ethernet requirements
2. 350 µH OCL at 8 mA bias supports stable baseline and reduced distortion
3. Optimized for low EMI and reliable link performance over twisted‑pair copper cables

FAQ

Q1: What is OCL in 10/100Base-T magnetics?

OCL (Open Circuit Inductance) describes the inductance of the transformer primary when the secondary is open. In 10/100Base-T Ethernet designs, adequate OCL is critical for maintaining signal integrity at low frequencies.
For S16037G, a minimum OCL of 350 µH at 8 mA DC bias helps:
 

• Prevent baseline wander in MLT-3 encoded signals
• Maintain stable link performance over long copper cables
• Meet IEEE 802.3u return loss and distortion requirements

 
Insufficient OCL can result in increased jitter, packet errors, or link instability, especially in noisy environments.
 

Q2: Can S16037G replace Pulse or Halo Fast Ethernet transformers?

Yes. S16037G can be used as a functional replacement for many Pulse and Halo 10/100Base-T Ethernet transformer modulesџь with similar electrical specifications.
When evaluating replacement compatibility, designers should verify:
 

• Matching turns ratio (1:1)
• Comparable OCL rating (≥350 µH)
• Equivalent package type and pinout (SMD-16P)
• Isolation voltage and insertion loss limits

 
S16037G meets the core IEEE 802.3u electrical requirements commonly specified for Fast Ethernet magnetics, making it suitable for drop-in or near drop-in replacement in many designs.
 

10/100Base-T vs 1000Base-T Magnetics: Key Differences

 
Although both are Ethernet magnetic components, 10/100Base-T and 1000Base-T transformers are designed for different signaling and performance requirements.
 

10/100Base-T Magnetics

• Support 10 Mbps and 100 Mbps data rates
• Typically use single-pair signaling per channel
• Lower bandwidth and crosstalk requirements
• OCL values around 350 µH are sufficient
• Commonly used in cost-sensitive and embedded designs

1000Base-T Magnetics

• Support 1 Gbps data rates over four twisted pairs
• Require stricter return loss, crosstalk, and DCMR performance
• Often feature integrated common-mode chokes
• Higher complexity and tighter impedance control
• Used in switches, routers, and high-performance LAN equipment

 
Selecting the correct magnetics type ensures compliance with IEEE standards and avoids signal integrity issues during Ethernet PHY operation.
 

S16037G 10/100Base-T SMD Ethernet transformer Summary

 
The S16037G is a standards-compliant 10/100Base-T SMD Ethernet transformer offering 350 µH OCL, low insertion loss, and high isolation in a compact footprint. It is well suited for Fast Ethernet applications requiring reliable signal integrity, RoHS compliance, and compatibility with mainstream Fast Ethernet PHY designs.