STM32 Ultra Low Power MCUs

ST’s ultra-low-power MCU platform is based on a proprietary ultra-low-leakage technology and optimized design.

STM32 ultra-low power microcontrollers offer designers of energy-efficient embedded systems and applications a balance between performance, power, security, and cost effectiveness. The portfolio includes, the STM32L0 (Arm® Cortex®-M0+), the STM32L4 (Arm® Cortex ®-M4) and the STM32L5 MCU (Arm® Cortex®-M33).
The STM32U5 series (Arm® Cortex®-M33) with its best-in-class power consumption and enhanced security features is the latest addition to this rich portfolio.


  • Advanced HMI
  • POS Point of sales
  • Metering
  • Sensors
  • Medical and Healthcare
  • Home appliance
  • White goods
  • Advanced HMI
  • e-bike
  • EV charging
  • Wearables
  • Speaker, Smart speaker, and Audio Hub

Product types:


The new STM32U5 series combines the latest and most efficient Arm® Cortex®-M33 core with an innovative 40 nm platform that reduces energy consumption to the bone, while increasing performance. The series also adds the state-of-the-art features which are required in today’s applications, including advanced cyber security with hardware-based protection, and graphics accelerators for rich graphical user interfaces.


The STM32L5 series enhanced security features leverage Arm® Cortex®-M33 and its TrustZone® for Armv8-M. Thanks to this new core and a new ST ART Accelerator™ (also supporting external memory), the STM32L5 reaches a 443 CoreMark.

The STM32L4 series offers the excellence of ST’s ultra-low power platform with an additional performance dimension by providing 100 DMIPS with DSP instructions and Floating-Point Unit (FPU), more memory (up to 1 Mbyte of Flash memory) and innovative features.
The STM32L4+ series extends STM32L4 technology by offering higher performance (120 MHz/409 CoreMark executing from internal Flash memory), larger embedded memories (up to 2 Mbytes of Flash memory and 640 Kbytes of SRAM), and rendering advanced graphics without compromising ultra-low-power consumption.
The STM32L0 series offers a genuine energy-saving solution for entry-level applications. Available in tiny packages down to 14 pins and with a wide range of Flash memory densities from 8 to 192 Kbytes, the STM32L0 features ultra-low power consumption in a competitive portfolio.

Read more about the benefits of the 32-bit Arm® Cortex®-M processor for MCUs here

Discover our portfolio

stm32u5 portfolio


The STM32 ultra-low power MCU series enables new features in embedded system designs and offers best-in-class performance:

    Complete and consistent ultra-low power family
  • From entry-level range to advanced range
  • From 8kB to 4MB of Flash
  • From Cortex®-M0+ up to Cortex®-M33
  • Pin-to-pin compatible family
  • Extended temperature range
    High energy efficiency
  • Innovative power management features
  • Various Low-power modes
  • Very efficient dynamic run mode
STM32 MCU Developer Zone
Everything for STM32 MCU developers, in one place.

Understanding the STM32U585 security configurations to fully benefit from SESIP and PSA certifications

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STM32U585 is an open, general-purpose microcontroller offering specific security features that meet PSA Level-3 & SESIP 3 standards. To learn how to use the SESIP / PSA-certified configuration of the STM32U585 and to understand the security functions covered by these certificates, read our dedicated resources that will guide you during your development.