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    About SMLIGHT Ethernet LAN8720 Addon

    SMLIGHT Ethernet LAN8720 Addon

    Add a wired Ethernet port to devices that don't have one built in. The Ethernet ADD-ON provides a reliable 10/100 Mbps network connection with a standard RJ-45 jack. It's built with industrial-grade protection — 1500V galvanic isolation keeps your device safe from power surges on the network cable, and ESD protection guards against static discharge. The module also includes a PoE tap, meaning it can pass through Power over Ethernet to power your device from the same cable that carries data. Ideal for wall-mounted or ceiling-mounted installations where running a separate power cable is inconvenient.

    ChipsetMicrochip LAN8720A
    ProtocolRMII
    Pinout14-pin header + 4-pin PoE
    Addon Size35 x 55 mm

    Key Features

    Wired Network Connection

    Standard RJ-45 Ethernet port with 10/100 Mbps auto-negotiation — just plug in a cable.

    PoE Pass-Through

    Built-in Power over Ethernet tap lets you power your device through the network cable — one cable for data and power.

    1500V Surge Isolation

    Industrial-grade magnetic isolation protects your device from voltage spikes and lightning-induced surges on the network.

    Auto Cable Detection

    HP Auto-MDIX automatically detects cable type — use any Ethernet cable, straight or crossover.

    Low Power Sleep Mode

    The module can power down its clock when idle, drawing almost no current until the network is needed again.

    ESD Protection

    TVS diodes on all data lines protect against electrostatic discharge during handling and installation.

    Technical Details

    Electrical Specifications

    ParameterMin.Typ.Max.Unit
    Supply Voltage (VDD)3.03.33.6V
    Operating Current (100BASE-TX)4555mA
    Power-Down Current210µA
    Operating Temperature-40+85°C
    SMLIGHT Ethernet LAN8720 Addon module

    Quick Reference

    Chipset
    Microchip LAN8720A
    Protocol
    RMII
    Pinout
    14-pin header + 4-pin PoE
    Addon Size
    35 x 55 mm

    Compatibility

    Works with SMLIGHT devices and external platforms. Standard interfaces make DIY integration straightforward.

    SMLIGHT Devices

    SeriesNotes
    SLWF-09Built-in slot

    DIY & External Platforms

    PlatformNotes
    ESP32 (all variants)RMII interface
    Raspberry PiVia SPI/Ethernet HAT
    Any MCU with RMII3.3V logic

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