# SONOFF Dongle Lite MG21

*SONOFF / Dongle-LMG21*

> The Dongle Lite MG21 is a compact USB dongle that ships as a Zigbee coordinator, so it is the hub that plugs into a Home Assistant, Zigbee2MQTT or openHAB host. It is built on a Silicon Labs EFR32MG21 and can be reflashed as a Zigbee router or with OpenThread firmware. It suits Home Assistant users through an integration (Zigbee).

- Canonical page: https://smarthomecanon.com/devices/sonoff-dongle-lite-mg21
- Last checked: 2026-10-09

## Key facts

| Fact | Value |
| --- | --- |
| Brand | [SONOFF](https://smarthomecanon.com/brands/sonoff) |
| Category | USB radio |
| Model numbers | Dongle-LMG21 |
| Status | Current[^1] |
| Works with | Home Assistant, Zigbee2MQTT, openHAB[^1] |
| Type | USB dongle, Zigbee and Thread[^1] |
| Chip | Silicon Labs EFR32MG21[^1] |
| Ships with | Zigbee coordinator (EmberZNet)[^1] |
| Thread RCP firmware | Yes: OpenThread firmware[^1] |
| In Home Assistant ZHA docs | unknown |
| In Zigbee2MQTT docs | unknown |
| Connection | USB, 0.5 m extension cable included[^1] |
| Power | 5 V, 500 mA[^1] |

## Integration paths

**How the SONOFF Dongle Lite MG21 connects**

| Path | Requires | Local | Features lost |
| --- | --- | --- | --- |
| [Matter / Thread](https://smarthomecanon.com/protocols/matter-thread) | OpenThread firmware, A host running a Thread border router[^1] | unknown | unknown |
| [Zigbee](https://smarthomecanon.com/protocols/zigbee) | Zigbee coordinator software such as ZHA or Zigbee2MQTT[^1] | Yes[^1] | Coordinator firmware cannot be added to another gateway (one coordinator per Zigbee network), One application per dongle: ZHA or Zigbee2MQTT, not both at once[^1] |

**Platform support for the SONOFF Dongle Lite MG21**

| Path | Platform | Support | Integration |
| --- | --- | --- | --- |
| Zigbee | [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) | Via integration[^1] | ZHA |

## Roles in a smart home

**Infrastructure roles**

| Role | Acts as one |
| --- | --- |
| Thread border router | unknown |
| Matter controller | unknown |
| Zigbee coordinator | Yes[^1] |

## Related pages

- [SONOFF dongles and bridges](https://smarthomecanon.com/lines/sonoff-zigbee-dongles-and-bridges) (line)
- [SONOFF](https://smarthomecanon.com/brands/sonoff) (brand)
- [Matter over Thread](https://smarthomecanon.com/protocols/matter-thread) (protocol)
- [Zigbee](https://smarthomecanon.com/protocols/zigbee) (protocol)
- [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) (platform)

## Sources

[^1]: SONOFF Dongle Lite MG21 product page. https://sonoff.tech/products/sonoff-dongle-lite-mg21-zigbee-thread-usb-dongle-dongle-lmg21 (manufacturer, checked 2026-10-09)