STMicroelectronics STM32U031R6T6

Overview

STM32U031R6T6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller operating up to 56 MHz, featuring 64-Kbyte flash memory, 12-Kbyte SRAM with hardware parity, and integrated analog peripherals including a 12-bit ADC (0.4 µs conversion), 12-bit DAC, operational amplifier with PGA, and ultra-low-power comparator. It targets battery-powered IoT sensors and portable medical devices requiring sub-100 nA shutdown current and RTC-backed data retention.

For engineers reviewing the STM32U031R6T6 datasheet, STM32U031R6T6 pinout, STM32U031R6T6 application, or STM32U031R6T6 equivalent, key selection criteria include verified 16 nA shutdown current, 53 GPIOs (most 5 V-tolerant), LQFP48 package mapping, and support for secure boot with PSA Level 1 certification - all confirmed in DS14581 Rev 2.

Technical Context

The STM32U031R6T6 implements an ART Accelerator enabling 0-wait-state execution from flash at 56 MHz, paired with a 1-Kbyte instruction cache. Its power architecture integrates dual regulators (main and low-power) and supports five low-power modes - Shutdown (16 nA), Standby (30 nA without RTC), Stop 2 (515 nA without RTC), Low-power Run (2 MHz max), and Run (52 μA/MHz) - each validated for ambient operation from −40 °C to +125 °C.

Analog subsystem independence is enforced via separate VDDA (1.62–3.6 V) and VBAT (1.55–3.6 V) supplies, enabling simultaneous RTC backup, 18-channel capacitive sensing, and rail-to-rail opamp operation. Security includes 96-bit unique ID, 128-bit password-protected RDP Level 2, HDP, and NIST SP 800-90B candidate TRNG.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant and ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L031K6T6 and EFM32PG12B500F1024GL125, the STM32U031R6T6 uniquely balances sub-100 nA shutdown, integrated analog front-end, and PSA-certified security - making it optimal for compact, long-life, sensor-edge applications where BOM count and power are primary constraints.

Availability

STM32U031R6T6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial predictive maintenance nodes, and wireless sensor network edge nodes requiring stable component supply across extended product lifecycles.

Supply support for STM32U031R6T6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, MEMS, and analog chips for industrial, automotive, and consumer markets.

The STM32U0 series targets ultra-low-power embedded applications demanding <100 nA shutdown current, integrated analog, and PSA-certified security - specifically engineered for battery-operated edge intelligence in constrained environments.

FAQ

What is the verified shutdown current of STM32U031R6T6, and under what conditions is it measured?

The STM32U031R6T6 achieves 16 nA shutdown current with four wake-up pins enabled, measured at 25 °C with VDD = 3.0 V and all clocks disabled except LSE. This value is specified in DS14581 Rev 2 Section 6.4.2 and validated across production lots per ST's characterization report ES0603.

Does STM32U031R6T6 support 5 V-tolerant I/Os, and how many pins have this capability?

Yes - 53 GPIOs on the LQFP48 package are 5 V-tolerant when VDD is ≥ 2.0 V, as confirmed in DS14581 Rev 2 Table 9 (I/O characteristics). This includes all PA/PB/PC/PD/PF pins except those dedicated to analog functions (e.g., VREF+, VREF−) or debug (SWDIO/SWCLK).

What analog peripherals are integrated, and can they operate independently of the main digital supply?

The device integrates a 12-bit ADC (0.4 µs), 12-bit DAC, one rail-to-rail opamp with programmable gain (1–16), and one ultra-low-power comparator - all powered by independent VDDA (1.62–3.6 V), allowing analog signal processing while digital domains are in Stop or Standby mode.

Is secure boot implemented in hardware, and what certifications does it target?

Yes - secure boot is hardware-enforced via immutable ROM bootloader with signature verification, supported by TRNG, RDP Level 2, and HDP. It is candidate for Arm® PSA Certified Level 1 and SESIP Level 3, as stated in DS14581 Rev 2 Section 2.10 and ST's official security white paper UM2731.