STM32U3B5/3C5: extend battery life and protect user data in cost-sensitive devices
Bringing high performance DSP & edge AI to ultra-low power designs
Bringing high performance DSP & edge AI to ultra-low power designs
The STM32U3B5/U3C5 line is built on an Arm® Cortex®‑M33 core and include 640 Kbytes of RAM and up to 2 Mbytes of dual‑bank flash.
The line integrates ST’s hardware signal processing (HSP) technology, accelerating DSP and AI tasks while drastically improving power efficiency, to deliver edge AI performance typically found only on larger, high‑power chips.
Key benefits
Extended battery life
Reduce dynamic power consumption with near-threshold and hardware processing technology.
Cost-effective design
Simplify PCB design, reduce costs with diverse packages, and leverage a robust development ecosystem to accelerate time to market.
Enhanced security
Secure cryptographic keys with hardware protection. Ensure product authenticity using in-factory attestation and robust security.
Key features
- Arm Cortex-M33 core with FPU
- 640 Kbytes RAM and up to 2 Mbytes flash dual bank
- I3C, FDCAN, SPI, UART interfaces
- 117 Coremark/mW and 10 µA/MHz
- Near-threshold technology
- Hardware signal processor (HSP)
- Extended temp: -40°C to +105°C
- PSA Certified L3 & SESIP3 targets
Applications
Industrial IoT
Smart metering
Medical
Consumer
Getting started
Nucleo-144 board
Affordable prototyping
Leverage extensive memory and rich peripherals to support applications ranging from industrial to consumer.
Free embedded software
Simplify application development and debugging
All the essential embedded software components to help you develop, configure, and debug applications on the STM32U3.
Free AI tools
Leverage the STM32 AI software ecosystem
Bring your own data or model: explore edge AI possibilities and deploy AI models efficiently on STM32.
STM32U3 blog article
The first STM32 with a 0.65 V VCORE is making near-threshold CMOS mainstream