IoT WiFi module > UART/SPI module > RAK423


RAK423 ultra-low power consumption, streamlining the AT command, both small size and low cost characteristics, rich and expand two-way high-speed transmission features, easy to use, you can achieve efficient development of IoT.

  • ☼ Small package size: 20.5mm×15.6mm
  • ☼ Low Power: Standby low to 3mA in the network, the depth of the lowest dormant 1.5uA;
  • ☼ EasyConfig: patent protection, one-key to network connection;
  • ☼ High speed UART: baud rate up to 921600bps, the actual throughput of up to 70KB/S;
  • ☼ Streamlined AT command: let you fast link network;
  • ☼ Stable transmission: a single 10MBytes packet is not lost bytes;

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Shenzhen Headquarters

  • Room 1007, Hangsheng Technology Building, South Four Road, Science and Technology Park, Nanshan District, Shenzhen
  • TEL: 0755-86108311
  • Fax: 0755-86152201

Shanghai R&D Center

  • B205 Lvliang Technology Pioneer Park, 2588 Hongmei South Road, Minhang District, Shanghai
  • TEL: 021-61553990
  • Fax: 021-54721038

Beijing Office

  • Tencent Zhongchang Zone, Huilongguan, Changping District, Beijing
Introduction Specifications Application Specifications


RAK423 module is a Wi-Fi module that fully compliant with IEEE 802.11b/g/n wireless standards, with internally integrated TCP / IP protocol stack, supporting numerous protocols such as ARP, IP, ICMP, TCP, UDP, DHCP CLIENT, DHCP SERVER, DNS and other etc. It supports AP mode, Station mode and Ad-hoc and mode. Users can easily and quickly use it to networking and data transmission. The baud rate of module serial port is up to 921600bps, which can fully meet the low-rate applications.

RAK423 supports storing parameters, and by the customer commands it determines whether to enable automatic networking to realize easy networking and reduce time for system to networking. The module has built-in WEB server, supporting wireless network parameters configuration, supporting wireless firmware upgrade. It also supports WPS and EasyConfig one-key networking, significantly reducing software development effort.

RAK423has four power management modes, among which the minimum standby power consumption is <2uA, fully meet customer’s requirement for low power design.


  • ☼ Support IEEE 802.11b/g/n wireless standards
  • ☼ Support UART communication with data flow control, with the maximum baud rate of 921600bps
  • ☼ Minimalist hardware peripheral circuit design
  • ☼ Support Station, Ad-hoc and AP modes
  • ☼ Support OPEN, WEP, WPA-PSK, WPA2-PSK and WPS encryption
  • ☼ Support TCP, UDP protocols, with maximum 8 UDP/TCP connections
  • ☼ Support webpage-based parameter configuration
  • ☼ Support WPS and EasyConfig one-key to network connection
  • ☼ Support parameter storage, customer orders loading after boot
  • ☼ Support parameters store in Deep Sleep State, with connection time as fastest as 300ms
  • ☼ Support wireless upgrade firmware
  • ☼ On-board ceramic antenna or U.FL antenna connector
  • ☼ Operating voltage: 3.3V
  • ☼ 4 kinds power working modes, with minimum power consumption as 1-2uA
  • ☼ S mall package size: Length x width = 20.5mm × 15.5mm(curved needle height: 6.4mm,vertical needle height: 8.7mm)
  • ☼ FCC, RoHS and CE compliant


  • ☼ Portable products
  • ☼ Home appliances and electrical appliances
  • ☼ Industrial sensors
  • ☼ Sales terminals
  • ☼ Buildings automation
  • ☼ Logistics and freight management
  • ☼ Home security and automation
  • ☼ Medical applications, such as patient monitoring, medical diagnostics
  • ☼ Metering (stop timing, measuring instruments, meters, etc.)


Hardware Information
WIFI Chip Qualcomm AR6K
MCU Nuvoton NANO
RF Parameter
Wireless standard 802.11 b/g/n
Frequency Range 2.412GHz-2.484GHz
Transmitting Power 802.11b: +17 dBm (Max.)
802.11g: +17 dBm (Max.)
802.11n: +17 dBm (Max.)
Receiving Sensitivity 802.11b: -97dBm
802.11g: -91dBm
802.11n: -89dBm
Transmission Speed< 802.11b:11 Mbps
802.11g:54 Mbps
802.11n:54 Mbps
Antenna On-board ceramic antenna、External Antenna IPEX
Transmission Distance External maximum 120m (open sight, 2dBI antenna)
Maximum 80 meters onboard antenna (open line of sight)
WIFI Parameter
Wireless network type STA / AP / Ad-hoc Mode
Security Mechanism WEP / WPA-PSK / WPA2-PSK / WAPI
Encryption Type WEP64 / WEP128 / TKIP / AES
Networking Protocol TCP / UDP / ARP / ICMP / DHCP / DNS / HTTP
Maximum number of TCP connections 8
AP maximum number of connections 1
Speed Networking Around 220ms
Communication Interface UART
Work Pattern Reduced AT command, UART
Interface Parameters Default 115200, you can configure.
Interface Standard UART ,3.3V
Electrical Parameters
Working Voltage 3.3V (3.14~3.46)
Working Temperature -40℃~ 85℃(Technical Grade)
Storage Temperature -65℃~ 135℃,5 ~ 95% RH(No Condensation)
Size 20.5mm×15.6mm
Configuration Tools Wireless scan configuration, Web configuration, AT configuration, App configuration, WPS configuration
Customer Application Provide Android, iOS and SDK on the PC development kit
Provide customer application platform SDK driver source
Hardware reference design
Defects Liability Period 1 Years


Model Web
STA Mode
OTA Update Number
of Socket
Network Info Saved
Ultra Low
Power Mode
Local Discovery
RAK473 Yes 3 Yes Yes 8 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 1 No UDP/mDNS
RAK476 No 3 Yes Yes 8 No No Yes Yes Yes No MQTT No Yes No 1 No UDP
RAK413 Yes 1 No Yes 8 No No Yes Yes Yes HTTP No No No Yes 1 Yes UDP
RAK423 Yes 1 No Yes 8 No No Yes Yes Yes HTTP No No No Yes 1 Yes UDP