LAN8720 Ethernet Transceiver Module – RMII for Arduino & STM32
LAN8720 Ethernet Transceiver Module – RMII for Arduino & STM32
LAN8720 Ethernet Transceiver Module with RMII Interface
Add reliable wired network connectivity to your microcontroller projects with the LAN8720 Ethernet Transceiver Module. Built around the industry-standard LAN8720A chip, this compact board features a Reduced Media Independent Interface (RMII) — making it a perfect fit for Arduino, STM32, ESP32, and other popular development platforms. Whether you're building a home automation hub, an IoT sensor node, or a networked data logger, this module delivers stable, low-power 10/100 Mbps Ethernet performance.
Key Features
- LAN8720A Chip: Industry-proven Fast Ethernet PHY transceiver supporting 10BASE-T and 100BASE-TX
- RMII Interface: Reduced pin-count RMII connection for easy integration with STM32, ESP32, and Arduino-compatible boards
- Wide I/O Voltage Range: 1.6 V to 3.6 V supply voltage — compatible with 3.3 V logic systems
- Wide Operating Temperature: –40 °C to +85 °C for reliable performance in demanding environments
- Auto-Negotiation: Automatically detects and configures link speed and duplex mode
- Low Power Consumption: Energy-efficient design ideal for battery-backed and embedded systems
- Compact DIY-Friendly Form Factor: Breadboard-compatible pin layout for rapid prototyping
- Condition: Brand new
- Quantity: 1 module per package
Specifications
| Chip | LAN8720A |
| Interface | RMII (Reduced Media Independent Interface) |
| Network Standards | 10BASE-T / 100BASE-TX |
| I/O Supply Voltage | 1.6 V – 3.6 V |
| Operating Temperature | –40 °C to +85 °C |
| Package | DIY Kit (1 × Module) |
| Country of Origin | Made in Mainland China |
Ideal Applications
- Arduino & STM32 Ethernet projects
- ESP32 wired network connectivity
- IoT gateways and sensor nodes
- Home automation controllers
- Industrial embedded network interfaces
- Network-enabled data loggers
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Frequently Asked Questions
Q: Is the LAN8720 module compatible with STM32 and ESP32 microcontrollers?
A: Yes! The LAN8720 module uses the standard RMII interface, which is directly supported by STM32 (via HAL/LL Ethernet libraries) and ESP32 (via ESP-IDF). It is also usable with any Arduino-compatible board that supports RMII Ethernet PHY connections, making it extremely versatile for DIY and professional projects alike.
Q: What voltage levels does the LAN8720 Ethernet module support?
A: The module operates with an I/O supply voltage range of 1.6 V to 3.6 V, making it fully compatible with 3.3 V logic systems commonly found on STM32, ESP32, and modern Arduino boards. It is not directly compatible with 5 V logic without a level shifter.
Q: What network speeds does the LAN8720 transceiver support?
A: The LAN8720A chip supports both 10BASE-T (10 Mbps) and 100BASE-TX (100 Mbps) Ethernet standards with auto-negotiation, so it will automatically select the best available speed when connected to a router or switch — no manual configuration required for most setups.