New MCUs deploy near-threshold chip design to boost power efficiency

January 8, 2026

The launch of the ultra-low-power STM32U3 series microcontrollers by STMicroelectronics has created new opportunities for IoT device manufacturers to extend the run-time of small batteries without compromising system performance or security.

The new STM32U3 series of microcontrollers from STMicroelectronics implements cutting-edge power-saving innovations which ease the deployment of battery-powered embedded devices, especially in remote locations.

 

These latest MCUs are aimed at IoT devices that operate for extended periods without maintenance and with the limited energy from a coin cell or ambient solar or thermoelectric source. The MCUs take advantage of innovative techniques such as near-threshold design to cut dynamic power consumption and boost efficiency.

 

In addition to extreme energy efficiency, the STM32U3 MCUs, which are based on an Arm® Cortex®-M33 core running at up to 96MHz, meet the needs of IoT devices by providing robust cybersecurity. For instance, the STM32U385 line can confine secret keys permanently in secure memory, eliminating vulnerable CPU fetches. In addition, attestation credentials for each production unit are provisioned by ST before leaving the factory.

 

The rich set of security capabilities and assets in the STM32U3 series helps device manufacturers to comply with regulations such as the European Union radio equipment directive and the cybersecurity resilience act.

 

The STM32U3 series gives designers flexibility to optimize board layout, with a choice of nine package options with from 32 to 100 pins, including UFQFPN, WLCSP, LQFP and UFBGA styles.

Features

  • Power-saving features:
    • 6µA Stop current
    • 117 Coremark score per milliwatt
  • Memory:
    • 512kbytes or 1Mbyte of dual-bank Flash memory
    • 256kbytes of SRAM
  • Security features:
    • SESIP3 and PSA Level 3 certifiable security assets
    • Cryptographic accelerators on STM32U385 line
    • TrustZone® isolation
    • Random number generator
  • I3C interface
  • FD CAN interface
  • Operating-temperature range: -40°C to 105°C

Applications

  • Utility meters
  • Healthcare devices:
    • Glucose meters
    • Insulin pumps
  • Animal care monitors
  • Industrial sensors:
    • Thermostats
    • Smoke detectors
  • Forest fire sensors
  • Smart watches
  • Wearable devices
  • Small audio devices
STMicroelectronics — STM32U3 Microcontrollers

Evaluation Board

Part Number: [NUCLEO-U385RG-Q]

The STM32 Nucleo-64 board for the STMicroelectronics STM32U3 series of ultra-low-power microcontrollers provides an affordable and flexible way for users to try new concepts and build prototypes.

 

The new STM32U3 series implements cutting-edge power-saving innovations which ease the deployment of battery-powered embedded devices, especially in remote locations.

 

These latest MCUs are aimed at IoT devices that operate for extended periods without maintenance and with the limited energy from a coin cell or ambient solar or thermoelectric source. The MCUs take advantage of innovative techniques such as near-threshold design to cut dynamic power consumption, boosting efficiency by a factor of two compared to the previous STM32U5 series of ultra-low-power MCUs from ST.

 

The NUCLEO-U385RG-Q board offers Arduino Uno V3 connectivity support. ST morpho headers allow easy expansion of the functionality of the STM32 Nucleo open development platform with a wide choice of specialized shields.

 

The STM32 Nucleo-64 board does not require any separate probe as it integrates the ST-LINK debugger/programmer.

 

The STM32 Nucleo-64 board is supplied with comprehensive, free STM32 software libraries and examples available with the STM32Cube MCU package.

FTM Board Club

Sign up for access to exclusive development boards, an essential tool for many innovative design projects.

*Available to pre-qualified EMEA customers only.

Tags

Categories

Related Articles

Infineon — NBT2000 NFC I2C Tag
NFC I2C bridge tag for contactless authentication and secure configuration of IoT devices Facebook Linkedin-in Youtube The...
Read More
STMicroelectronics — VL53L8CH Time-of-Flight Sensor
Ranging sensor provides optimized data outputs for AI applications...
Read More
Murata — MHM332 Series Ionizer Module
Low-ozone ionizer produces increased negative ion output for ventilation systems...
Read More

Subscribe to our newsletters

Subscribe to Future Electronics

Get access to the latest product information, technical analysis, design notes and more

Choose your region