LAN8720 Ethernet PHY Transceiver Module — RMII Interface, 10/100Mbps, 3.3V, for STM32 / ESP32

LAN8720 Ethernet PHY Transceiver Module — RMII Interface, 10/100Mbps, 3.3V

The LAN8720 module is a compact Ethernet PHY transceiver board based on the Microchip LAN8720A IC, providing 10/100Mbps Ethernet connectivity via the RMII (Reduced Media Independent Interface) to microcontrollers such as STM32, ESP32, and other RMII-capable MCUs. With HP Auto-MDIX support, it works with both straight-through and crossover cables without manual configuration.

Key Specifications

Parameter	Value
IC	Microchip LAN8720A
Interface to MCU	RMII (Reduced MII)
Ethernet Speed	10Mbps / 100Mbps (auto-negotiation)
Supply Voltage	3.3V
Auto-MDIX	Yes (straight or crossover cable)
Connector	RJ45 with integrated magnetics
PHY Address	Configurable via PHYAD pins
Package (IC)	24-pin QFN

Why Choose LAN8720?

• ✅ RMII interface — only 9 signal pins to MCU (vs 18 for MII), simpler PCB routing
• ✅ 10/100Mbps auto-negotiation — connects to any modern Ethernet switch or router
• ✅ HP Auto-MDIX — no crossover cable needed
• ✅ 3.3V supply — compatible with STM32, ESP32, and most 3.3V MCUs
• ✅ Integrated RJ45 magnetics — no external transformer required

Typical Applications

• STM32 Ethernet peripheral (HAL ETH driver)
• ESP32 wired Ethernet (esp-idf eth driver)
• Embedded web server with wired LAN
• Industrial Ethernet node (Modbus TCP, EtherNet/IP)
• IoT gateway with wired network connection

Package Contents

• 1 × LAN8720 Ethernet PHY Transceiver Module

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