STMicroelectronics STM32U073R8T6

Overview

STM32U073R8T6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M0+ 32-bit MCU operating up to 56 MHz, featuring 256-Kbyte flash memory, 40-Kbyte SRAM with hardware parity, and integrated USB 2.0 full-speed crystal-less interface. It delivers 407 ULPMark™-CP and supports LCD driving (8×48 segments) with internal step-up converter for battery-powered portable instrumentation.

For engineers reviewing the STM32U073R8T6 datasheet, STM32U073R8T6 pinout, STM32U073R8T6 application, or STM32U073R8T6 equivalent, key selection criteria include VBAT mode current (130 nA), Stop 2 mode consumption (695 nA without RTC), 12-bit ADC conversion time (0.4 µs), 16-channel capacitive sensing support, and LQFP64 package compatibility with 69 GPIOs (6 wake-up pins).

Technical Context

The device integrates 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 deterministic interrupt latency. Its power architecture uses dual regulators (MR/LPR) and supports six low-power modes - including Shutdown (16 nA), Standby (30 nA without RTC), and Stop 2 (695 nA) - with automatic VBAT/VDD switchover and brownout reset (BOR) with four programmable thresholds.

Analog subsystem includes independent VDDA supply, 12-bit ADC with hardware oversampling (up to 16-bit), 12-bit DAC with sample-and-hold, one rail-to-rail op-amp with PGA (gain up to 16), and two ultra-low-power comparators - all accessible in Stop mode with dedicated low-power timers and DMA mapping via DMAMUX.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package 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 Arm Cortex-M0+ microcontroller applications.

Compared with STM32L073RZT6 and RA2E2A20GJF#AC0, the STM32U073R8T6 uniquely combines crystal-less USB, LCD controller, and 130 nA VBAT mode - making it optimal for compact, battery-powered HMI devices where display, connectivity, and multi-decade runtime are co-required.

Availability

STM32U073R8T6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and secure access control terminals requiring stable component supply across long-lifecycle deployments.

Supply support for STM32U073R8T6 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, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32U0 series targets ultra-low-power embedded applications demanding <100 nA shutdown current, integrated human-machine interface (LCD/USB/touch), and PSA-certifiable security - bridging the gap between legacy ultra-low-power MCUs and mainstream Cortex-M portfolios.

FAQ

What is the maximum operating frequency and core type of the STM32U073R8T6?

The STM32U073R8T6 features an Arm® Cortex®-M0+ 32-bit RISC core with a maximum operating frequency of 56 MHz. It includes an ART Accelerator with 1-Kbyte instruction cache to enable zero-wait-state execution from flash memory, achieving 1.13 DMIPS/MHz and 134 CoreMark® at full speed. The core integrates a Memory Protection Unit (MPU) and supports Thumb-2 instruction set for efficient code density.

Does the STM32U073R8T6 support crystal-less USB operation?

Yes, the STM32U073R8T6 integrates a full-speed USB 2.0 device interface with built-in clock recovery, eliminating the need for an external 12 MHz crystal. This crystal-less architecture supports Link Power Management (LPM) and Battery Charging Detection (BCD), and operates across the full 1.71–3.6 V supply range. The USB PHY is powered by the dedicated VDDUSB supply (3.0–3.6 V) and remains functional in low-power modes when enabled.

How many GPIOs does the LQFP64 package support, and what is their voltage tolerance?

The STM32U073R8T6 in LQFP64 package supports up to 69 fast I/Os, with most pins rated for 5 V tolerance even when VDD is as low as 1.71 V. These GPIOs include 6 dedicated wake-up pins usable in Shutdown, Standby, and Stop modes. Pin multiplexing is managed via SYSCFG registers, and all GPIOs support configurable pull-up/pull-down, open-drain, and alternate function modes per the RM0503 reference manual.

What are the lowest power consumption modes and their typical current values?

The STM32U073R8T6 achieves 16 nA in Shutdown mode (6 wake-up pins active), 30 nA in Standby mode without RTC, and 695 nA in Stop 2 mode without RTC - all measured at 25 °C with VDD = 3.3 V. VBAT mode consumes 130 nA while retaining RTC and 9×32-bit backup registers. These values are validated per DS14548 Rev 2 and assume default configuration; actual current depends on enabled peripherals and clock sources.