STMicroelectronics STM32L5 series of ultra-low-power MCUs

STMicroelectronics STM32L5 series of ultra-low-power MCUs


The STM32L5 microcontroller series is the solution and provides a new optimal balance between performance, power, and security

Security has emerged as one of the 3 key areas that developers of embedded and IoT applications are thriving to improve. The STM32L5 microcontroller series is the solution and provides a new optimal balance between performance, power, and security. The STM32L5 MCU series harnesses the security features of the Arm Cortex-M33 processor and its TrustZone for Armv8-M combined with ST security implementation. ST-proprietary ultra-low-power technologies create a class-leading MCU for energy-conscious applications such as the Internet of things (IoT), medical, industrial and consumer.

Key features

  • More Security with TrustZone Security and ST Security Implementation
  • Lower Power Consumption
  • Integration, Size, Performance: More performance, Large Memory Size and Wide Portfolio
  • A Full Set of Security Options​​

Additional features

A full set of security options:

  • Flexible hardware and software secure isolations with TrustZone
  • Enhanced security services:
    • dedicated secure user memory space for Secure Boot, symmetric and asymmetric crypto accelerations, memory and IP protection
    • independent readout protection between secure/non-secure domains, active I/O tamper detection
    • certified crypto lib, embedded Secure Firmware Install loader and ecosystem.

Low power consumption:

  • EEMBC ULPBench®: 402 ULPMark-CP score
  • Embedded SMPS step down converter (optional)
  • Best power consumption numbers with full flexibility:
    • 33 nA in shutdown mode
    • 3.6 µA in stop mode with full SRAM and peripheral states retention with 5µs wake-up time
    • Down to 60 µA/MHz in active mode

Integration, size, and performance:

  • Better application responsiveness:
    • New Arm® Cortex®-M33 at 110 MHz performance: +20% versus Cortex®-M4
    • New ST ART Accelerator: working both on internal and external Flash (8 Kbytes of instruction cache)
  • Capable of achieving 165 DMIPS and 442 CoreMark scores
  • High integration and innovation: large memory, USB Type-C with power delivery controller, CAN FD
  • Large portfolio: 7 package types (LQFP48, QFN48, LQFP64, WLCSP81, LQFP100, UFBGA132 and LQFP144)


  • Factory Automation
  • Motor Control
  • Electricity Meter
  • Home Automation
  • Smart Bike
  • Electronic Door Lock

Available tools

Commercial Product : NUCLEO-L552ZE-Q Distri buy Cost (USD) : 16$ Recommended Resale Price (USD) : 20$ Commercial Product: STM32L562E-DK Distri buy Cost (USD) : 61$ Recommended Resale Price (USD) : 76$ Commercial Product: STM32L552E-EV Distri buy Cost (USD) : 220$ Recommended Resale Price (USD) : 275$  STD. BASE QTY: 1 STD. BULK QTY: 1 Actual Xrate : 1 USD = 0.89337 EUR

Mike is the founder and editor of, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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