STMicroelectronics STM32U031G6Y6TR

Overview

STM32U031G6Y6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller operating up to 56 MHz, featuring 32-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-μA standby operation.

For engineers reviewing the STM32U031G6Y6TR datasheet, STM32U031G6Y6TR pinout, STM32U031G6Y6TR application, or STM32U031G6Y6TR equivalent, key selection criteria include VBAT mode current (130 nA), Stop 2 mode consumption (630 nA with RTC), 53 fast I/Os (most 5 V-tolerant), and WLCSP27 package compatibility for space-constrained designs.

Technical Context

The device implements an ART Accelerator enabling 0-wait-state execution from flash at 56 MHz, paired with a 1-Kbyte instruction cache and single-cycle multiplier for 1.13 DMIPS/MHz performance. 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 (515–630 nA), Low-power run (2 MHz max), and Run (52 μA/MHz).

Analog subsystem features independent VDDA supply (1.62–3.6 V), hardware oversampling for 16-bit ADC resolution, rail-to-rail OPAMP with programmable gain up to 16, and dedicated tamper detection on 5 pins - all coordinated via a 32-bit multi-AHB bus matrix and APB peripherals including 6x USART/LPUART, 3x I²C, and 2x SPI.

Key Specifications

Pinout & Package

STM32U031G6Y6TR uses the WLCSP27 (Wafer-Level Chip-Scale Package) with 27 solder bumps in a 2.55 × 2.34 mm body, optimized for ultra-compact PCB layouts and automated assembly. Pin assignment follows ST's standardized WLCSP27 layout for STM32U0-series devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L031K6T6, STM32U031G6Y6TR adds DAC, OPAMP, and 30 nA lower Standby current; versus EFM32PG12B500F1024GL125, it offers smaller WLCSP27 footprint and integrated analog gain control - making it optimal for miniaturized, sensor-integrated designs demanding <100 nA quiescent operation.

Availability

STM32U031G6Y6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable environmental loggers requiring stable component supply across long-lifecycle deployments.

Supply support for STM32U031G6Y6TR 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 automotive semiconductors since 1987.

The STM32U0 series targets ultra-low-power embedded applications demanding sub-100 nA standby current, integrated analog signal chains, and PSA-certified security - specifically engineered for battery-operated IoT endpoints where size, energy, and trust are non-negotiable.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM32U031G6Y6TR operates at up to 56 MHz using its internal 16-MHz RC oscillator (HSI16) boosted by PLL. In Run mode with LDO regulator enabled, it consumes 52 μA per MHz - resulting in approximately 2.91 mA at 56 MHz. This value assumes VDD = 3.3 V, ambient temperature of 25 °C, and typical flash/SRAM activity without peripheral clocks enabled.

Does this MCU support hardware-accelerated cryptographic operations?

No, the STM32U031G6Y6TR does not include a dedicated cryptographic accelerator (e.g., AES engine or PKA). It provides true random number generation (TRNG) compliant with NIST SP 800-90B and secure boot enforcement, but symmetric/asymmetric encryption must be implemented in software using its Cortex-M0+ core and protected flash memory with RDP Level 2.

Can the 12-bit DAC output drive a 50 Ω load directly?

No, the integrated 12-bit DAC has a low-power sample-and-hold output stage rated for capacitive loads only (≤50 pF). Driving a 50 Ω resistive load would exceed its output current capability and cause significant voltage droop. An external rail-to-rail op-amp buffer (such as the internal OPAMP1 configured in unity-gain mode) is required for such applications.

Is the WLCSP27 package compatible with standard reflow soldering processes?

Yes, the STM32U031G6Y6TR in WLCSP27 (2.55 × 2.34 mm) is qualified for lead-free reflow soldering per JEDEC J-STD-020, with peak temperature up to 260 °C. ST recommends using stencil aperture ratio ≥0.67 and controlled ramp rates (≤3 °C/s) to prevent bump voiding or die cracking during assembly.