STMicroelectronics STM32U073C8U6

Overview

STM32U073C8U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller 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 VBAT mode at 130 nA with RTC and 9 backup registers - enabling long-life battery-powered IoT sensor nodes and portable medical devices.

For engineers reviewing the STM32U073C8U6 datasheet, STM32U073C8U6 pinout, STM32U073C8U6 application, or STM32U073C8U6 equivalent, key selection criteria include its 16 nA shutdown current, 4 μs wake-up from Stop mode, 12-bit ADC with 0.4 µs conversion, LCD driver (8×48 segments), and dual-supply analog domain (VDDA/VDD) for precision sensing in constrained energy environments.

Technical Context

The STM32U073C8U6 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 real-time control. Its power architecture includes dual regulators (MR/LPR), independent VDDA (1.62–3.6 V) for analog peripherals, and VBAT domain with automatic switchover for RTC retention.

It implements a full low-power hierarchy: Shutdown (16 nA), Standby (30 nA w/o RTC), Stop 2 (695 nA w/o RTC), and Run mode at 52 μA/MHz - all coordinated by PWRCTRL and SYSCFG blocks. The MCU supports secure boot, PSA Level 1 and SESIP Level 3 candidate certification, and 96-bit unique ID for device identity.

Key Specifications

Pinout & Package

STM32U073C8U6 is housed in a 48-pin UFQFPN package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant and ECOPACK2 certified. Pinout validated per DS14548 Rev 2 (pages 42–47) and ST's official pin configuration tool.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L073RZT6 and RA4M2G10CHJ01, the STM32U073C8U6 uniquely combines sub-µA Stop 2 operation, crystal-less USB, and integrated LCD driver - making it the only option for battery-powered displays requiring <1 µA quiescent current and direct USB configuration.

Availability

STM32U073C8U6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and low-power HMI display modules requiring stable component supply across extended product lifecycles.

Supply support for STM32U073C8U6 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 components for industrial, automotive, and consumer markets.

The STM32U0 series targets ultra-low-power embedded applications demanding sub-µA sleep currents, integrated analog, and secure USB connectivity - optimized for battery-operated edge devices with 10+ year field deployment requirements.

FAQ

What is the minimum supply voltage for STM32U073C8U6 operation?

The STM32U073C8U6 operates from 1.71 V to 3.6 V on VDD. Below 1.71 V, brownout reset (BOR) triggers to prevent unreliable flash/SRAM operation. The VDDA analog supply must be ≥1.62 V for ADC/COMP use or ≥1.80 V for DAC/OPAMP operation - independent of VDD level.

Does STM32U073C8U6 support USB without an external crystal?

Yes. It integrates a crystal-less USB 2.0 full-speed PHY with internal 48 MHz clock recovery, eliminating the need for an external 48 MHz crystal or oscillator. This is confirmed in DS14548 Rev 2 Section 2.1 and validated in ST's UM2722 application note for USB enumeration stability.

How many GPIOs are available in the UFQFPN48 package?

The STM32U073C8U6 in UFQFPN48 provides 39 GPIOs, including 6 dedicated wake-up pins (PA0, PA1, PA2, PA3, PC13, PC14). All GPIOs except those assigned to mandatory functions (e.g., USB, reset) are 5 V-tolerant, simplifying interface with legacy 5 V peripherals.

Is the 12-bit ADC capable of hardware oversampling?

Yes. The integrated 12-bit ADC supports hardware oversampling up to 16×, enabling effective resolution up to 16 bits with configurable shift and accumulation. This feature is documented in RM0503 Section 17.4.11 and used in ST's AN5319 for noise-sensitive sensor applications.