The new STM32WBA2 for cost-and energy-sensitive wireless applications

[Maxime_MARCHETTO1]

The STM32WBA2 extends the STM32WBA family with a more integrated, cost-effective MCU for low-power wireless devices. 

As the most affordable STM32 wireless MCU supporting Bluetooth® LE and IEEE 802.15.4, it adds improved wireless features and new communication interfaces while staying fully compatible with existing products.  

Powered by an Arm® CortexM33 at 64 MHz, it provides a compact and efficient platform for flexible wireless applications. 

Improved wireless performance for robust IoT designs 

• High‑performance radio delivering stable connectivity with +10 dBm max output power 

• Supports Bluetooth® LE, Zigbee, and Thread for broad protocol compatibility 

• Programmable Tx power in 1 dB steps to precisely tune energy consumption and extend battery life 

• Flexible power‑control leveraging ultra-low-power STM32 MCU architecture for longer battery life  

Cost-effective platform with more integration 

• 512 Kbytes of flash and 96 Kbytes of RAM to support both your application and connectivity stacks 

• USB‑FS and Q-SPI with XiP and on-the-fly decryption for richer connectivity and memory expansion options 

• Compact package options: QFN48, QFN32, WCSP37 

• 2‑layer PCB support to simplify layout and reduce BOM costs 

• Pin-to-pin compatibility with existing STM32WBA products for easy scaling and migration 

 

Streamlined development 

• Supported by the STM32Cube ecosystem, offering dedicated middleware, tools, extensive documentation, and application examples  

• RF reference designs, IPD chip, and optional external PA enabling Tx power boosts up to +20 dBm 

Advanced security features for regulatory compliance 

Targeting SESIP3 and PSA Level 1 certification, STM32WBA2 provides strong security foundations to help developers address upcoming requirements from RED, CRA, and the US Cyber Act. A secure firmware update capability helps developers ship long-lasting, compliant products with confidence. 

Additional resources

• Datasheet - STM32WBA2xxx
• Product overview - NUCLEO-WBA25CE1 (Nucleo-64 board) 
• Product overview - X-NUCLEO-WBA25A1 (Nucleo expansion board) 

First published on Feb 25, 2026

[OliM]

If we are considering a Thread device which uses BLE for commissioning: Is there any memory left for an application?

[Dominique FOLLEZOUR]

Hello

That is correct. With 512 Kbytes of flash memory and 96 Kbytes of RAM, the WBA2 primary target is not to support BLE and Thread protocols in the same application.

There are no sample codes in the WBA2 Cube package to address this use case. However this is still possible. 

A BLE+Thread(SED) would consume ~400Kbytes Flash & 80 Kbytes RAM. This still give room for short application. You can refer to WBA65RI\Applications\BLE_Thread\BLE_HeartRate_Thread_SED.

Br

Dom