LilyGo T-Internet POE Ethernet Board with ESP32 and LAN8720A

The LilyGo T-Internet POE is an ESP32-based Ethernet development board with integrated Power-over-Ethernet (PoE) functionality. It is specifically designed for IoT, smart home, and industrial applications that require a reliable wired network connection with simultaneous power supply via PoE. At the heart of the board is an ESP32-WROOM module with 4 MB flash that supports not only Wi-Fi 2.4 GHz but also Bluetooth 4.2 BLE. Wired network connectivity is provided by the LAN8720A Ethernet PHY chip, while the Si3404 PoE PD chip converts the 48 V Ethernet voltage to 5 V system voltage - ideal for stable and low-maintenance installations. The board features a USB-C port, a microSD card slot, as well as reset and boot buttons. With the optional CH340C downloader, the board can be programmed directly via USB. This combination makes the T-Internet POE a robust and flexible platform for edge devices, gateways, data loggers, or smart home controls with LAN connectivity.

Recommended Accessories:

• LilyGo Downloader for T-Internet-POE

Features:

• ESP32-WROOM with integrated Wi-Fi and Bluetooth 4.2
• LAN8720A Ethernet PHY for wired communication
• Si3404 PoE PD Chip for Power-over-Ethernet
• microSD card slot for data storage
• USB-C port and optional CH340C programming interface
• Reset and boot buttons onboard
• Compatible with Arduino IDE, ESP-IDF, and PlatformIO
• Ideal for gateways, network nodes, and automation projects

Application Examples:

• PoE-powered IoT gateways or controllers
• Sensor and actuator controllers with Ethernet connection
• Smart home or industrial systems with LAN communication
• Long-term data loggers or remote monitoring systems
• Mini web server with SD card logging

Documentation:

• Github

Technical Specifications:

• Manufacturer: LILYGO
• Manufacturer SKU: H438
• Microcontroller: ESP32-WROOM
• Flash Memory: 4 MB
• Ethernet Chip: LAN8720A
• PoE Chip: Si3404 (PoE PD)
• Wireless: Wi-Fi 802.11 b/g/n, Bluetooth 4.2 BLE
• Memory Card: microSD Slot (TF Card)
• Interfaces: USB-C, GPIO, UART, I2C, SPI
• Programming Interface: CH340C (optional)
• Power Supply: 5 V (USB-C) or 48 V (PoE)
• Dimensions: 51 × 70 × 19 mm
• Weight: 30 g

Contents:

• 1 × LilyGo T-Internet POE Ethernet Board with ESP32 and LAN8720A