STMicroelectronics STM32U031G8Y6TR

Overview

STM32U031G8Y6TR 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, 12-bit DAC, operational amplifier, and ultra-low-power comparator - deployed in battery-powered IoT sensor nodes requiring sub-1-μA standby operation with RTC retention.

For engineers reviewing the STM32U031G8Y6TR datasheet, STM32U031G8Y6TR pinout, STM32U031G8Y6TR application, or STM32U031G8Y6TR equivalent, key selection criteria include verified shutdown current (16 nA), VBAT-mode RTC retention (130 nA), 53 GPIOs (most 5 V-tolerant), and WLCSP27 package compatibility for space-constrained wearable designs.

Technical Context

The device implements an ART Accelerator enabling 0-wait-state execution from flash at 56 MHz, paired with dual voltage regulators (main and low-power) to support dynamic mode switching between Run (52 μA/MHz), Stop 2 (515–630 nA), and Shutdown (16 nA). Its power architecture includes independent VDDA (1.62–3.6 V) for analog blocks and VBAT (1.55–3.6 V) for RTC/backup registers.

Core peripherals include a 32-bit general-purpose timer, 16-bit advanced motor-control timer, two low-power 16-bit timers active in Stop mode, three I²C interfaces (up to 1 Mbit/s), six USART/LPUARTs, and a 7-channel DMA controller with flexible mapping - all coordinated via a 32-bit multi-AHB bus matrix and APB interconnect.

Key Specifications

Pinout & Package

STM32U031G8Y6TR uses the WLCSP27 (2.55 × 2.34 mm) package, a 27-ball wafer-level chip-scale package with 0.4-mm pitch, optimized for ultra-compact PCB footprints in space-constrained applications such as hearables and implantable monitors.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L031K6T6 and RA2E1A20FJFP#AA0, the STM32U031G8Y6TR uniquely combines sub-1-μA Stop/Shutdown currents, integrated op-amp+comparator+DAC, and WLCSP27 packaging - making it the only option enabling <2-mm² analog-sensing nodes with <10-μA average system current.

Availability

STM32U031G8Y6TR is available at Aetrix Electronics and suitable for smart wearable sensor nodes, industrial predictive maintenance sensors, medical patch monitors, and asset tracking beacons requiring stable component supply across long-lifecycle deployments.

Supply support for STM32U031G8Y6TR 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 sensors, and automotive semiconductors since 1987.

The STM32U0 series targets ultra-low-power battery-operated edge devices, emphasizing sub-100-nA shutdown current, integrated analog front-ends, and compact wafer-level packaging - specifically engineered for multi-year IoT endpoints where size, energy, and signal-chain integration are co-constrained.

FAQ

What is the minimum supply voltage for reliable operation of STM32U031G8Y6TR?

The device operates reliably from 1.71 V to 3.6 V on VDD. Below 1.71 V, brownout reset (BOR) triggers to prevent undefined behavior; the internal 16-MHz RC oscillator remains stable down to 1.62 V on VDDA for analog blocks, but VDD must meet the 1.71-V threshold for digital functionality.

Does STM32U031G8Y6TR support hardware-accelerated cryptography?

No. It includes a true random number generator (TRNG) candidate for NIST SP 800-90B and supports secure boot, but lacks dedicated AES or SHA accelerators. Cryptographic operations must be implemented in software using the Cortex-M0+ core and memory protection unit (MPU) for isolation.

Can the integrated op-amp drive a 10-kΩ load with rail-to-rail output swing?

Yes. The op-amp supports rail-to-rail output swing and delivers ±10 mA output current, sufficient to drive 10-kΩ loads with full 0–VDD range swing at room temperature. Output impedance remains <1 Ω within 100 mV of rails, per DS14581 Section 6.3.11.

Is the WLCSP27 package compatible with standard reflow soldering profiles?

Yes. The WLCSP27 (DT71281V2) package complies with JEDEC J-STD-020D moisture sensitivity level 3 and supports peak reflow temperatures up to 260 °C for ≤10 seconds. Recommended profile uses ramp-to-peak ≤3 °C/s, peak 235–245 °C for 40–80 s, and cooling rate ≤6 °C/s.