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Multi-radio Ethernet coordinator series · Zigbee + Thread simultaneously · SLZB-OS · SMLIGHT
SLZB-MRxU.
Two networks simultaneously.
SLZB-MRxU by SMLIGHT is an Ethernet coordinator with two independent radio chips. Unlike the SLZB-06xU series, where one radio chip handles either Zigbee or Thread at a time, here each protocol runs on its own dedicated radio — simultaneously, without switching or performance loss.
The series consists of five models with the same enclosure — only the pair of radio chips inside differs. First, what the device does, then which model to choose.
What it does
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Zigbee coordinator on a dedicated radio
The first radio chip manages the Zigbee network as a coordinator or router — compatible with Zigbee2MQTT and ZHA.
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Thread border router — in parallel
The second radio chip simultaneously manages the Matter-over-Thread network — without waiting for Zigbee.
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USB devices over the network
Additionally, a connected USB device (Z-Wave, BLE, 4G modem) becomes accessible over the network just like both radio chips.
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Power — PoE, USB-C, or both simultaneously
PoE 802.3af (48V) or USB-C (5V). Both power sources can be connected simultaneously — the input is optically isolated.
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Ideal for
Simultaneous Zigbee and Thread operation without MultiPAN compromises — for individual homes or large meshes. | Migration from a mixed ecosystem — an existing Zigbee device fleet and new Matter devices in one coordinator. | Fleet standardization — SLZB-MR5U with identical radio chips simplifies firmware management and maintenance. |
Advanced users, who have outgrown a single radio chip in the SLZB-06xU series and need both networks to operate fully. |
The key difference of the series
Two radios, not one shared by two protocols
The most common question about multiprotocol coordinators is: "can Zigbee and Thread run simultaneously?" With SLZB-MRxU, the answer is yes — truly simultaneously. This is not MultiPAN firmware that shares one radio chip between two networks in turns (with packet loss and delays under load). Here, each protocol has its own dedicated radio chip and its own channel.
The result: both networks can operate on their optimal channels, without compromising stability or speed.
Choose a model
Everything is the same except the pair of radio chips
| Model | SLZB-MR1U MAINSTREAM |
SLZB-MR2U VALUE |
SLZB-MR3U RECOMMENDED |
SLZB-MR4U PREMIUM |
SLZB-MR5U HOMOGENEOUS |
| Radio 1 (Zigbee) |
CC2652P7 Texas Instruments |
CC2652P Texas Instruments |
CC2674P10 Texas Instruments |
CC2674P10 Texas Instruments |
EFR32MG24 Silicon Labs |
| Radio 2 (Thread) |
EFR32MG21 Silicon Labs |
EFR32MG21 Silicon Labs |
EFR32MG24 Silicon Labs |
EFR32MG26 Silicon Labs |
EFR32MG24 Silicon Labs |
SLZB-MR5U — єдина модель з двома однаковими радіочипами (обидва EFR32MG24): один toolchain, одна прошивка на обидва радіо, зручно для стандартизації парку пристроїв.
How to get started
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01
Connect power and network
Ethernet cable (with or without PoE) or USB-C. Both can be used simultaneously.
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02
Enable Zigbee and Thread in the web interface
Both radios activate independently — no compromises or "either-or" choice.
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03
Connect to the server
Two network addresses (one for each radio) are added to Home Assistant, Zigbee2MQTT, or ZHA.
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Key hardware features
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ESP32-S3 core + 2 PSRAM
Manages both radio chips simultaneously, the USB host, web interface, and SLZB-OS.
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Ethernet W5500
Hardware 10/100 Mbps TCP/IP controller from WIZnet — stable connection without interference.
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Two rotatable +5 dB antennas
Dedicated antenna for each radio chip, L-shaped, with 3-axis adjustment.
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PoE 802.3af + USB-C
Power via network (48V) or USB-C (5V); both simultaneously with optical isolation.
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USB-A passthrough
Dedicated USB host port — a connected device (CP210x, CH340) becomes accessible over the network.
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6 LED + кнопка
Separate indication for each radio, power, and network. One button for mode control.
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Software
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Bluetooth Proxy — in parallel with both radios
Thanks to PSRAM, the device also works as a BLE proxy for Home Assistant without taking resources away from Zigbee or Thread.
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Zigbee Hub mode
Direct control of Zigbee devices through the web interface. Available on MR1U–MR4U (TI radio for Zigbee).
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OTBR
Built-in OpenThread Border Router — for Matter-over-Thread without additional hardware.
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WireGuard VPN + DDNS
Безпечний віддалений доступ до пристрою, навіть якщо провайдер змінює IP-адресу.
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OTA-оновлення
Update both radio chip firmware and SLZB-OS over the network with one click.
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ESPHome support
Switch to ESPHome via the built-in web flasher and back, without a flashing cable.
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Compatibility
Tested and verified
| Zigbee | Zigbee2MQTT, ZHA — on the first radio chip, coordinator or router. |
| Thread / Matter | Matter-over-Thread border router on the second radio chip, simultaneously with Zigbee. |
| Bluetooth | BLE Proxy for Home Assistant — in parallel with both radios. |
| USB Passthrough | Z-Wave dongles, BLE modules, 4G modems, and other devices based on CP2102 / CH340 / CDC_ACM. |
| Сервери | Home Assistant (native SMLIGHT integration), openHAB, HomeSeer. |
Important — read before ordering
The pair of radio chips is fixed for each model
The enclosure, ports, and firmware are the same for the entire SLZB-MRxU series. The pair of radio chips is selected when ordering (see the model table above) and cannot be changed in hardware after purchase.
Zigbee Hub mode — only where TI radio is present
SLZB-MR1U–MR4U have a TI chip on the first radio and support Zigbee Hub mode. SLZB-MR5U (both radios are Silicon Labs) does not support this function.
USB Passthrough — one device at a time
Only one external USB device can be connected through the USB host at a time, regardless of both radio chips already operating in parallel.
The exception is devices based on the CP2102 radio chip, they support connecting up to 2 USB devices!
Technical specifications
| Type | Ethernet coordinator with two independent radio chips, series with 5 variants |
| Radio chips | TI + Silicon Labs pair (MR1U–MR4U) or two EFR32MG24 (MR5U) — depending on the model, see the table above |
| Controller | ESP32-S3, 2 cores × 240 MHz, PSRAM |
| Ethernet | W5500 (WIZnet), 10/100 Mbps |
| USB | USB-A passthrough (one external device) + USB-C power |
| Power | PoE 802.3af (48V) or USB-C (5V), can be used simultaneously |
| Antennas | 2 × external, +5 dB, rotatable (L-shaped) — one per radio chip |
| Indicators | 6 LEDs, 1 mode button |
| Firmware | SLZB-OS · WireGuard · DDNS · OTA · OTBR · Bluetooth Proxy · multilingual web interface · ESPHome |
| Dimensions / weight | 160 × 24 × 28 mm · 86 g (device); package with box — 180 × 25 × 40 mm · 105 g |
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