IoT WiFi module > SPI WiFi Module > RAK439

High Speed SPI WiFi Module RAK439

RAK439 have ultra-small size, both low-power, low-cost characteristics, rich functionality and expand SPI bidirectional transfer WiFi high-speed transmission, it can achieve efficient development of IoT.

  • ☼ Small package size: 16mm×14mm×3.2mm
  • ☼ High-speed SPI: SPI clocked at 24Mhz, the actual throughput of 6Mbps
  • ☼ EasyConfig: patent protection, one-key to network connection
  • ☼ Support TCP, UDP protocols, with maximum 8 UDP/TCP connections
  • ☼ Fast Networking: 1s quickly wake up and automatic networking
  • ☼ Stable transmission: a single 10MBytes packet is not lost bytes

   Buy Now


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


RAK439 is an ultra-low-power, low-cost module that fully supports of major encryption modes as well as WAPI encryption mode, a Wi-Fi ® module with SPI interface that supports 802.11b/g/n protocol. The module internally integrates RF station, balun, RF switch, crystal oscillator and power switch circuit, enabling fast hardware design with very little circuits for peripherals. Plus, the module has built-in IPEX external antenna base, also leads antenna foot that allows on-board antenna design。

RAK439 SDK software library has encapsulation for WIFI module interface driver, providing a platform-specific driver function, so that customers can easily integrate the module into their main platform, greatly shorten the evaluation cycle. Software library also provides a network-related API; user can quickly complete the module's network configuration and connection. Socket section uses BSD socket type operation, easy to operate.

Driver Library supports both NOS operation and OS operation; user can choose either according to actual operation flexibility.


  • ☼ four-wire SPI interface, with interface rate maximum 24Mbps
  • ☼ Module throughput is up to 6Mbps
  • ☼ Compliant with IEEE 802.11b/g/n wireless standards, support single-stream 802.11n, providing high throughput
  • ☼ Support infrastructure network mode (Station mode), routing mode (SoftAP)
  • ☼ Support WPA/WPA2-PSK TKIP/AES, WAPI-PSK encryptions
  • ☼ Support EasyConfig network configuration,WPS, Easyconfig mode
  • ☼ Support PMK fast networking (time <1s)
  • ☼ Support 802.11 PS mode, low power mode
  • ☼ Support types of TCP server and client, UDP server and client
  • ☼ Supports up to eight socket, supports blocking and non-blocking operations
  • ☼ DHCP server and client
  • ☼ DNS client
  • ☼ Provide driver library for a variety of platforms, occupied resources size
  • Flash <40KB,Ram <10KB
  • ☼ Power supply: 3.1~3.5V
  • ☼ Working temperature: -40~+85°C
  • ☼ Moisture sensitive level (MSL) Level 3
  • ☼ Package size: 16.08mm x 14.08mm x 2.2mm


  • ☼ Medical Device
  • ☼ Industrial Handset
  • ☼ Industrial automation and measurement
  • ☼ WIFI Camera
  • ☼ Internet-based Consumer electronics, like playing station


Hardware Information
WiFi Chip Qualcomm AR6K
MCU Depending on the customer master chip
Hardware Requirements Driver library offers a variety of platforms, footprint size Flash <40KB Ram <10KB.
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 RF PIN output, external antenna IPEX
Transmission Distance External maximum 120m (open sight, 2dBI antenna)
RF PIN output depends on the customer's antenna design effect.
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 1s
Communication Interface Four-wire SPI
Work Pattern Four-wire SPI communications
SPI operation Library functions operating, SPI interrupt optional
Interface Standard SPI ,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 28.75mm×23.14mm×3.40mm
Configuration Tools SPI commands to configure, App a key configuration, WPS configuration
Customer Application Provide Android, iOS and SDK on the PC development kit.
Provide customer application platform SDK driver source
Defects Liability Period 1 Years


Model The maximum
rate of data transfer
TCP/IP Provide
SDK library
Whether to encapsulate
API function
Whether to
port a driver
Whether to
occupy master
control space
How difficult the
programming is
Web WPS EasyConfig
RAK439 8Mb/s Yes Yes Yes Yes Yes More difficult No Yes Yes
RAK411 2Mb/s Yes Yes No Yes Yes Easier Yes Yes Yes
RAK421 2Mb/s Yes Yes No Yes Yes Easier Yes Yes Yes