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STMicroelectronics SPWF04

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STMicroelectronics  SPWF04 - WiFi module with integrated antenna

Cloud-compatible certified Wi-Fi module accelerates IoT and M2M development

The SPWF04 is a small size, power-efficient Wi-Fi module, enabling standalone or serial-to-Wi-Fi operation modes. It supports advanced Internet-security features - including WPA2-Enterprise - and comes with a full-featured TCP/IP protocol stack with WebSocket support.

The SPWF04SA and the SPWF04SC integrate a Cortex-M4-based STM32 microcontroller and a powerful Wi-Fi transceiver, compliant with IEEE 802.11 b/g/n standard for the 2.4 GHz band. Both are certified FCC/IC and CE.

The modules are cloud compatible thanks to the complete protocol package, which includes application and security layers likes HTTP, MQTT, SMTP and WebSockets. They can operate in serial-to-Wi-Fi and standalone mode, with customer applications developed in the subsystem based on the MicroPython environment. The modules are configured around a single-chip 802.11 transceiver with integrated PA and comprehensive power management subsystem, and an STM32F4 microcontroller with UART/SPI interface and an extensive GPIO suite; they also incorporate timing clocks and a voltage regulator. With low power consumption and an ultra-compact (2.7 x 1.5 cm) footprint, the modules are ideal for fixed and mobile wireless applications, as well as challenging battery-operated applications.

Key features

  • 2.4 GHz IEEE 802.11 b/g/n transceiver
  • High performance STM32F439 with ARM® Cortex® -M4
    • 256 KB SRAM, 2 MB embedded high-speed Flash memory
    • 1 MB Flash memory for user storage, extendable via SD/MMC interface or external SPI Flash
  • Integrated TCP/IP protocol stack
    • 8 simultaneous TCP or UDP clients and 2 socket servers (supporting up to 8 clients each)
    • Secured socket and upper layers (i.e. HTTPS) supporting up to TLS 1.2, including AES (128, 256), hash (MD5, SHA-1, SHA-256) and RSA (1024, 2048)
    • Web server supporting SSI
  • Open, WEP, WPA2 PSK, WPA2 Enterprise
  • WPS for station
  • System modes: Station, IBSS, and miniAP (supporting up to 5 Stations)
  • miniAP easily provisioned (SSID, PWD)
  • Fast Wi-Fi re-association after reset
  • Secure Firmware and FileSystem updates Over The Air (OTA)
  • Antenna options: integrated antenna/U.FL connector


  • Machine-to-machine communication
  • Industrial control and data acquisition
  • Home automation and security systems
  • Wireless sensors networks
  • Connected appliances
  • Cable replacement
  • Medical equipment
STMicroelectronics  SPWF04 module image

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