STMicroelectronics STM32U073MBI6

Overview

STM32U073MBI6 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 battery-backed real-time monitoring in portable medical sensors.

For engineers reviewing the STM32U073MBI6 datasheet, STM32U073MBI6 pinout, STM32U073MBI6 application, or STM32U073MBI6 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 supporting 8×48 segments, and dual 5 V-tolerant GPIO banks for mixed-voltage industrial HMI designs.

Technical Context

The STM32U073MBI6 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 includes dual regulators (MR/LPR), programmable brownout reset (BOR), and independent analog supplies (VDDA, VDDUSB, VBAT) supporting simultaneous operation of ADC, DAC, OPAMP, and USB transceivers.

It implements a 32-bit multi-AHB bus matrix connecting Cortex-M0+ core to APB peripherals including three low-power 16-bit timers active in Stop mode, 21 capacitive sensing channels, and a dedicated LCD controller with internal step-up converter - all managed under a Memory Protection Unit (MPU) for RTOS-based secure partitioning.

Key Specifications

Pinout & Package

STM32U073MBI6 is housed in a 64-ball UFBGA package (5 × 5 mm, 0.5 mm pitch) with 69 GPIOs (68 available in UFBGA64), including 5 V-tolerant pins on Port A and Port C. The package supports ECOPACK2 environmental compliance and exposes dedicated pins for VBAT, VREF+, VDDA, VDDUSB, and tamper detection.

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 RA2E2A00JFMC, the STM32U073MBI6 uniquely combines crystal-less USB, LCD driver, and sub-20 nA shutdown - making it optimal for compact, battery-powered human-interface and sensor-edge devices requiring minimal external components.

Availability

STM32U073MBI6 is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial HMI panels, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for STM32U073MBI6 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 extended battery life, secure firmware execution, and high integration - specifically optimized for portable healthcare, smart metering, and industrial IoT edge nodes.

FAQ

What is the maximum operating frequency and core type of the STM32U073MBI6?

The STM32U073MBI6 features a 32-bit Arm® Cortex®-M0+ core rated for up to 56 MHz operation. It includes an ART Accelerator with 1-Kbyte instruction cache enabling zero-wait-state execution from flash memory. The core supports Thumb-2 instruction set, MPU, and deterministic interrupt handling with <1 µs latency - validated in DS14548 Rev 2 Section 3.1 and RM0503 Section 2.1.

Does the STM32U073MBI6 support crystal-less USB operation, and what clock source enables it?

Yes, the STM32U073MBI6 supports USB 2.0 full-speed operation without an external crystal via its internal 48 MHz HSI48 oscillator synchronized using the Clock Recovery System (CRS) with USB SOF packets. This eliminates the need for a 12 MHz crystal and associated load capacitors, reducing BOM cost and PCB area - confirmed in DS14548 Rev 2 Section 2.2 and Section 6.3.10.

How many GPIOs are available in the UFBGA64 package, and which are 5 V-tolerant?

The STM32U073MBI6 in UFBGA64 provides 68 GPIOs, with 5 V-tolerance on all pins of Port A and Port C (PA0–PA15, PC0–PC15), except PA13/PA14 (SWD debug pins). This allows direct interfacing with 5 V logic peripherals without level shifters - specified in DS14548 Rev 2 Table 1 and Pinout Description Section 4.1.

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

The lowest power modes are Shutdown (16 nA), Standby without RTC (30 nA), and Stop 2 without RTC (695 nA) - all measured at 25 °C with VDD = 3.3 V. These values include active regulators and retained register/SRAM state where applicable, and are guaranteed across the -40 °C to +125 °C range per DS14548 Rev 2 Section 6.4.1 and Table 13.