STMicroelectronics STM32U073M8I6

Overview

STM32U073M8I6 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 + 9×32-bit backup registers - deployed in battery-powered medical sensors and portable industrial monitors.

For engineers reviewing the STM32U073M8I6 datasheet, STM32U073M8I6 pinout, STM32U073M8I6 application, or STM32U073M8I6 equivalent, key selection criteria include shutdown current (16 nA), Stop 2 mode power (695 nA without RTC), 12-bit ADC with 0.4 µs conversion, LCD driver (8×48 segments), and Arm PSA Level 1 / SESIP Level 3 security certification readiness.

Technical Context

The STM32U073M8I6 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 1.13 DMIPS/MHz performance. Its power architecture uses dual regulators (MR/LPR) and supports six low-power modes - including Shutdown (16 nA), Standby (30 nA w/o RTC), and Stop 2 (695 nA) - with 4 µs wake-up latency from Stop.

It embeds independent analog supplies (VDDA, VDDUSB, VBAT), a 12-bit DAC with sample-and-hold, two rail-to-rail comparators, one operational amplifier with PGA (gain up to 16), and 21 capacitive sensing channels. The USB PHY operates without external crystal via internal 48-MHz HSI48 clock recovery.

Key Specifications

Pinout & Package

STM32U073M8I6 is packaged in LQFP80 (12 × 12 mm, 0.5 mm pitch), with 68 GPIOs (69 total I/Os, including NRST), 6 dedicated wakeup pins, and dedicated analog supply pins (VDDA, VREF+, VSSA) decoupled from digital VDD/VSS domains.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power Arm Cortex-M0+ MCU applications.

Compared with STM32L073RZT6, the STM32U073M8I6 adds crystal-less USB and LCD while cutting Stop 2 current by 4.5×; versus RA2E2A10BDJ0, it provides superior analog integration and 45% higher ULPMark-CP - making it optimal for highly integrated, battery-constrained HMI and metering designs.

Availability

STM32U073M8I6 is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial wireless sensors, and low-power human-machine interfaces requiring stable component supply across multi-year production cycles.

Supply support for STM32U073M8I6 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 automotive semiconductors since 1987.

The STM32U0 series targets ultra-low-power embedded applications demanding sub-100-nA shutdown, integrated analog, and secure USB connectivity - optimized for battery-operated medical, metering, and industrial edge devices.

FAQ

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

The STM32U073M8I6 operates at up to 56 MHz using the internal 16-MHz HSI16 with PLL multiplication. In Run mode with LDO regulator enabled, it consumes 52 µA per MHz - measured at 3.3 V and 25 °C with ART Accelerator active and flash execution. This value scales linearly with frequency and is validated per DS14548 Rev 2 Section 6.3.1.

Does STM32U073M8I6 support crystal-less USB, and what clock source enables it?

Yes, it supports USB 2.0 Full-Speed without external crystal via its internal 48-MHz HSI48 oscillator, which is auto-trimmed by the 32.768-kHz LSE for ±0.25% accuracy. This eliminates the need for a 48-MHz crystal and associated load capacitors, confirmed in RM0503 Section 9.3.4 and DS14548 Section 4.3.3.

How many GPIOs are available in the LQFP80 package, and which are 5 V-tolerant?

The LQFP80 package provides 68 general-purpose I/Os (plus NRST), with up to 69 usable pins depending on configuration. Of these, 62 GPIOs are 5 V-tolerant when VDD is ≥ 2.0 V - explicitly listed in DS14548 Table 7 (Pinouts for LQFP80) and verified in Section 4.2.1 under "I/O port characteristics".

What security certifications is STM32U073M8I6 qualified for, and what features enable them?

The device is candidate for Arm® PSA Certified Level 1 and SESIP Level 3, enabled by its true random number generator (NIST SP 800-90B candidate), 96-bit unique ID, 5 passive anti-tamper pins, secure boot with hash-based signature verification, and hardware protection feature (HDP). These are documented in DS14548 Sections 3.11 and 6.10, and confirmed in ST's official PSA certification roadmap.