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)
| Parameter | Specification |
|---|---|
| Ethernet Standard | 10/100Base‑T |
| Turns Ratio (TX / RX) | 1CT:1CT / 1CT:1CT (±5%) |
| OCL (Min) | 350 µH @ 100 kHz, 0.1 V, 8 mA DC |
| Insertion Loss | −1.15 dB max (0.3–100 MHz) |
| Inter‑winding Capacitance (Cww) | 28 pF max |
| Leakage Inductance (L.L) | 0.5 µH max |
| Hi‑Pot | 1500 Vrms |
S16037G SMD-16P Ethernet Magnetic Module Datasheet
S16037G Datasheet-SCHEMATICS
S16037G Datasheet-Mechanicals
Signal Integrity Performance
Return Loss (dB Min)
| Frequency | Return Loss |
| 30 MHz | −18 dB |
| 60 MHz | −14 dB |
| 80 MHz | −12 dB |
Crosstalk (dB Min)
| Frequency | Crosstalk |
| 1–60 MHz | −45 dB |
| 60–100 MHz | −35 dB |
DCMR-Differential-to-Common Mode Rejection (dB Min)
| Frequency | DCMR |
| 30 MHz | −40 dB |
| 60 MHz | −35 dB |
| 100 MHz | −30 dB |
Mechanical Specifications of S16037G LAN Transformer
| Parameter | Value |
| Package Type | SMD‑16P |
| Body Dimensions | 12.8 mm × 6.9 mm |
| Mounting | Surface Mount |
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
- Designed to meet IEEE 802.3 / 802.3u Fast Ethernet requirements
- 350 µH OCL at 8 mA bias supports stable baseline and reduced distortion
- 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.
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