SLZB-06MU Zigbee Adapter

SMLIGHT SLZB-06MU Zigbee Adapter

The SMLIGHT SLZB-06MU is an Ethernet-first smart-home adapter built around the Silicon Labs EFR32MG21 Zigbee/Thread radio and an ESP32-S3 core. It connects Zigbee or Thread networks to your smart-home system over Ethernet, Wi-Fi or USB, while also supporting 802.3af Power over Ethernet (PoE) or 5V USB-C power.

The SLZB-06MU is designed for flexible network placement, allowing the radio adapter to be located where it provides better mesh coverage instead of being physically attached to a Home Assistant, openHAB or other smart-home server. It ships pre-flashed with SMLIGHT's SLZB-OS and supports Zigbee coordinator, Zigbee router and Matter-over-Thread border-router roles.

Silicon Labs EFR32MG21 Radio

The SLZB-06MU uses the Silicon Labs EFR32MG21 as its Zigbee/Thread radio SoC. The radio supports Zigbee 3.0 and Thread, with up to +20 dBm transmit power according to SMLIGHT's current product specifications. The included external L-I-shaped antenna is rotatable and rated at +5 dB on SMLIGHT's product page.

ESP32-S3 Core and SLZB-OS

The upgraded U-series hardware uses an ESP32-S3 core running SLZB-OS. The ESP32-S3 provides the web interface, OTA updates, USB passthrough and network-related functions. SMLIGHT states that the device is pre-flashed and tested before shipment.

Ethernet, Wi-Fi, USB and PoE Connectivity

The SLZB-06MU provides multiple connection and power options. Its W5500 Ethernet controller provides 10/100 Mbps Ethernet connectivity. The device can communicate over Ethernet, Wi-Fi or USB and can be powered through 802.3af PoE or 5V USB-C. PoE and USB-C can also be connected at the same time, with electrical isolation between the relevant power paths.

USB-to-Ethernet Passthrough

The SLZB-06MU supports USB passthrough, allowing supported USB serial devices such as CP210x, CH340 and CH9102-based dongles to be exposed over the network. This can be useful when a USB radio or other compatible serial device needs to be accessed remotely through the network.

Home Assistant, Zigbee2MQTT and ZHA Compatibility

The SLZB-06MU is designed to work with popular open smart-home platforms. SMLIGHT lists Home Assistant integration, ZHA and Zigbee2MQTT compatibility. The device can operate as a Zigbee coordinator or router and can also be configured for Matter-over-Thread border-router duties.

Flexible Installation

Because the SLZB-06MU communicates over Ethernet or Wi-Fi, it does not need to sit directly beside the smart-home server. This makes it possible to position the adapter in a location that is more suitable for Zigbee or Thread radio coverage. The compact enclosure measures 160 × 24 × 28 mm and the device weight is 86 g.

Firmware Updates and Configuration

SLZB-OS provides a web-based interface for setup, configuration and firmware management. SMLIGHT states that the radio firmware and core firmware can be updated remotely through the web interface, so normal firmware maintenance does not require a flashing cable.

Key Features

• Silicon Labs EFR32MG21 Zigbee/Thread radio
• Zigbee 3.0 support
• Thread support and Matter-over-Thread border-router capability
• ESP32-S3 core running SLZB-OS
• 10/100 Mbps Ethernet through W5500
• Wi-Fi connectivity
• USB connectivity and supported USB-to-Ethernet passthrough
• 802.3af PoE support
• 5V USB-C power
• Rotatable external L-I-shaped +5 dB antenna
• Pre-flashed and tested
• Remote OTA firmware updates
• Home Assistant, ZHA and Zigbee2MQTT compatibility
• 160 × 24 × 28 mm compact form factor
• 86 g device weight

What's Included

• 1 × SMLIGHT SLZB-06MU device
• 1 × external L-I-shaped +5 dB antenna
• 2 × screws
• 2 × adhesive pads
• 1 × hex wrench
• 1 × QR-code manual card
• 1 × ruler/stickered placement scale

Technical Specifications

Important Model Note

The SLZB-06MU is the Silicon Labs EFR32MG21 variant of the current SLZB-06xU family. SMLIGHT's current comparison specifically shows Zigbee Hub mode as unavailable on the 06MU, so this product should not be advertised as having the direct Zigbee Hub feature that is available on the TI-based 06U, 06P7U and 06P10U variants.

Frequently Asked Questions

What is the SMLIGHT SLZB-06MU?

It is a network-connected Zigbee/Thread adapter that bridges compatible smart-home radio networks to systems such as Home Assistant. It supports Ethernet, Wi-Fi, USB and PoE.

Which Zigbee chip does the SLZB-06MU use?

It uses the Silicon Labs EFR32MG21 radio SoC.

Does the SLZB-06MU support Zigbee 3.0?

Yes. SMLIGHT specifies Zigbee 3.0 support for the EFR32MG21 variant.

Does the SLZB-06MU support Thread?

Yes. The current SMLIGHT product specification lists Thread support and a Matter-over-Thread border-router role.

Does it work with Home Assistant?

Yes. SMLIGHT lists Home Assistant integration and compatibility with ZHA and Zigbee2MQTT.

Can the SLZB-06MU use Power over Ethernet?

Yes. It supports 802.3af PoE at 48V. It can also be powered through 5V USB-C.

Can I connect the SLZB-06MU by USB?

Yes. The U-series hardware supports USB connectivity and USB-to-Ethernet passthrough for supported USB serial devices.

Can the SLZB-06MU be updated remotely?

Yes. SMLIGHT provides remote radio and core firmware updates through the device's web interface.

Does the SLZB-06MU have Zigbee Hub mode?

No. SMLIGHT's current comparison lists Zigbee Hub mode for the TI-based 06U, 06P7U and 06P10U variants, but not for the Silicon Labs 06MU.