Sonoff RF Bridge 433

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Sonoff RF Bridge 433 is an ultra low power consumption device that can convert 433.92MHz (433MHz) to WiFi. It's a bridge between 433MHz RF and WiFi, which can be added to iOS & Android App eWeLink. Users can firstly pair 433MHz devices with the RF Remote, then add their RF Remote to the App. Therefore, users can control the 433MHz devices through App eWeLink. It's specially designed for mobile device and IoT application.

RF Bridge Map.png

From the picture, you can see the relations among the devices clearly. Firstly, you pair the 433MHz RF Remote controller with 433MHz device. Secondly, you add RF Bridge to App eWeLink. Thirdly, add the 433MHz RF Remote controller to RF Bridge via App, pair the buttons one by one. Then you can press the button on the App to turn on/off the 433MHz device remotely. One RF Bridge supports to add up to 4 RF Remote controllers.

You can add not only 1-4 buttons ordinary RF Remote to the RF Bridge on App, but also curtain RF Remote and Alarm. Please note that you can't see device status changes on the App.

Go shopping Sonoff RF Bridge 433 (SKU:IM170619001)

RF Bridge Diagram

433 rf bridge diagram.jpg

WIFI 2.4G Characteristics

  • Support wireless 802.11 b/g/n/d/e/i/k/r standard
  • Support STA/AP/STA+AP working modes
  • Support WPA/WPA2, PSK and WP
  • Built-in TCP/IP protocol stack
  • Support multi-channel TCP client connection
  • Support Wi-Fi Direct (P2P)
  • Multi-queue management, make full use of 802.11e-compliant QoS priority
  • Adaptive rate fallback algorithm sets the optimum transmission rate and Tx power based on actual SNR and packet loss information.

433.92MHz Wireless Characteristics

  • Complete monolithic UHF receive/transmit
  • Receive & transmit frequency: 433.92MHz
  • Receive sensitivity: -107dBm
  • Max transmit power: 17dBm
  • Transmission speed: 10kbps
  • Autotune without manual adjustment
  • Ultra low RF antenna radiation
  • The receiving supports fixed code encoding, like PT2260, PT2262, PT2264, EV1527, etc.
  • Not support to learn rolling code and dynamic code

Electrical Characteristics

The device is powered by micro USB cable. The power is supplied to the system through 3.3V LDO chip.

Rated Parameters

Power supply Micro USB:+5V
I/O voltage VSS - 0.3 ~ VDD + 0.3
Node Temp. +150℃
Storage Temp. -40℃ ~ +125℃
Operating Temp. -40℃ ~ +125℃
Soldering Temp. 260℃

Technical Parameters

Name Type Description
Chip ESP8285,EFM8BB1
Wi-Fi Wireless Standard IEEE 802.11b/g/n/d/e/i/k/r
Frequency 2.412GHz-2.484GHz
Transmit Power 802.11b: +20±2dBm (@11Mbps)
802.11g: +17±2dBm (@54Mbps)
802.11g: +14±2dBm (@HT20,MCS7)
Receiving Sensitivity 802.11b: -91 dBm (@11Mbps ,CCK)
802.11g: -75 dBm (@54Mbps, OFDM)
802.11n: -72 dBm (MCS7)
Antenna 2.4G onboard antenna
433.92M Working Frequency 433.92MHz
Demodulation Bandwidth 5000Hz
Transmit Power Transmitting mode: 12.5mA
Idle mode: 3mA
Standby mode: 1uA
Receive Current Continuous receiving mode: 3.9 ~ 4.5mA
Idle mode: 390uA
Standby mode: 0.9uA
Hardware Operating Voltage 3.0 ~ 3.6V
GPIO drive of main chip Max:12mA(ESP8285),12.5mA(EFM8BB1)
Operating Current Continue sending:70~200mA
Normal working:30~200mA
Stand-by mode:<200uA


Sonoff-RF Bridge hardware 1.PNG


CE RED Certificate and Test Report for Sonoff RF Bridge 433

Sonoff RF Bridge 433 Schematic

RF Universal Transeceive Module Serial Protocol_v1.0


ESP8285 Datasheet V1.4 EN

ESP8285 Datasheet V1.4 CN

Useful Links

User Manual in English


eWeLink Step-By-Step Guide

Wi-Fi Socket/Switch Fail to be Controlled Troubleshooting

Features wanted, bug report and discuss in Itead Smart Home Forum