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STMicroelectronics STM32WB50 Multi-Protocol Wireless Microcontrollers (MCUs)

The STMicroelectronics STM32WB50 Value Line wireless microcontrollers, a pin-compatible derivative of the STM32WB55 System-on-Chip (SoC), provide Bluetooth® 5.0, ZigBee® 3.0 or OpenThread connectivity capability to cost-sensitive connected devices.

The lower cost ‘Value Line’ STM32WB50 MCUs by STMicroelectronics offer a good link budget for reliable connectivity - 100dB in Bluetooth 5.0 mode up to 104dB in IEEE 802.15.4 mode - and a range of functions to maintain security.

The architecture of the STM32WB50 gives developers the ability to isolate the 2.4GHz radio from the application to enhance system security, or to support real-time operation. It features an Arm® Cortex®-M4 core to handle the user-application software, and a Cortex-M0+ core to run the radio sub-system, including the protocol stack and security operations. Basic on-chip security features include an AES-128 hardware cryptography engine, true random number generator, secure key storage, and a hardware public key authority.

As a cost-saving Value Line product, the STM32WB50 wireless microcontrollers integrate balun circuitry, helping manufacturers to reduce bill-of-materials cost as well as simplify their PCB layout. The STM32WB50’s package allows users to implement a simple PCB which consists of only one or two layers.

The STM32WB50 includes 1Mbyte of Flash memory and 128kbytes of RAM. It supports over-the-air updating of its radio stack.

Like the STM32WB55, the STM32WB50 MCUs benefit from the developer tools, software and environment provided by the STM32Cube ecosystem. It is supplied with Bluetooth 5.0, Bluetooth Mesh, ZigBee 3.0 or OpenThread certified stacks. The toolset includes the STM32CubeMonRF for radio performance evaluation, and the STM32CubeProg programmer which enables secure programming of the RF stacks.

STM32WB50 Features

  • Supply-voltage range: 2.0V-3.6V
  • Energy-saving operation
    • 14nA shut-down current
    • 700nA stand-by current
    • 303 ULPMark™ CP score
  • High performance:
    • 219.48 CoreMark® score
    • 3.43 CoreMark rating/MHz at 64MHz
  • Operating-temperature range: -10°C to 85°C
  • 12-bit ADC operating at up to 2.13Msamples/s
  • Up to 30 fast I/Os

STM32WB50 Applications

  • IoT devices
  • Building automation
  • Smart cities
  • Home appliances


Development Board

The P-NUCLEO-WB55 pack consists of a Nucleo multi-protocol wireless MCU development board and a complementary wireless dongle which also features an STM32WB MCU. The Nucleo board supports ST morpho and Arduino Uno expansion options.

STMicroelectronics P-NUCLEO-WB55