7490100111A 10/100BASE-TX SMT LAN Transformer -40°C to +105°C
The 7490100111A is a 10/100Base-T SMT Ethernet LAN transformer featuring 1:1 turns ratio, 350 µH OCL, 1500 V isolation, and –40 °C to +105 °C operation. It is ideal for industrial Ethernet and embedded networking applications.
7490100111A SMT LAN Transformer Overview
7490100111A is a compact 10/100Base-T surface-mount Ethernet LAN transformer from Würth Elektronik, designed to meet the electrical and isolation requirements of IEEE 802.3u networks.
It provides excellent signal integrity, high common-mode noise suppression, and reliable galvanic isolation for Fast Ethernet applications.
This model is widely used in industrial Ethernet devices, network interface cards (NICs), embedded controllers, IP cameras, and communication equipment where stable 10/100Base-TX performance is required.
Electrical Specifications
| Parameter | Specification |
|---|---|
| Ethernet Standard | IEEE 802.3u (10/100Base-TX) |
| Turns Ratio | 1:1 ±3% |
| Open Circuit Inductance (OCL) | ≥ 350 µH @ 100 kHz, 100 mV, 8 mA DC bias |
| Isolation Voltage | 1500 V RMS (1 minute) |
| Insertion Loss | ≤ –1.1 dB (1–100 MHz) |
| Return Loss | –18 dB min (1–30 MHz) |
| –14 dB min (30–60 MHz) | |
| –10 dB min (80–100 MHz) | |
| DCMR | –38 dB (1–60 MHz), –30 dB (60–100 MHz) |
| Crosstalk | –40 dB (1–60 MHz), –35 dB (60–100 MHz) |
Key Features of 7490100111A 10/100BASE-TX Ethernet transformer
- Designed for 10/100Base-TX Ethernet
- 1:1 turns ratio with tight tolerance
- Minimum 350 µH OCL at 100 kHz
- 1500 V RMS isolation voltage (1 minute)
- Low insertion loss across 1–100 MHz
- High return loss and DCMR performance
- Surface-mount (SMT) package for automated assembly
- Operating temperature: –40 °C to +105 °C
- RoHS compliant, MSL 1
Mechanical & Environmental Information
| Item | Specification |
|---|---|
| Mounting Type | Surface Mount (SMT) |
| Number of Channels | Single |
| Operating Temperature | –40 °C to +105 °C |
| Storage Conditions | < 40 °C, < 75% RH |
| Moisture Sensitivity Level | MSL 1 |
| Compliance | RoHS |
7490100111A Datasheet
Why Choose 7490100111A for Ethernet Designs?
Compared with generic LAN transformers, 7490100111A offers a balanced combination of:
- Stable inductance under DC bias
- Strong EMI and noise suppression
- Proven compliance with Fast Ethernet standards
- Reliable performance in industrial temperature ranges
- Compatibility with standard Ethernet PHYs
These characteristics make it a preferred choice for designers seeking long-term reliability and signal integrity in 10/100Base-T applications.
Looking for a reliable alternative or compatible Ethernet transformer to 7490100111A?
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Typical Applications of SMT LAN Transformer
- 10/100Base-T Ethernet ports
- Industrial Ethernet switches
- Embedded Ethernet controllers
- Network interface cards (NICs)
- IoT gateways and automation equipment
- IP cameras and security systems
- Communication and data acquisition devices
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