STMicroelectronics STM32U073CBT6

Overview

STM32U073CBT6 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 - deployed in battery-powered medical sensors and portable industrial monitors.

For engineers reviewing the STM32U073CBT6 datasheet, STM32U073CBT6 pinout, STM32U073CBT6 application, or STM32U073CBT6 equivalent, key selection criteria include verified 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 I/O banks for mixed-voltage system interfacing.

Technical Context

The STM32U073CBT6 integrates an ART Accelerator enabling 0-wait-state execution from flash at 56 MHz, coupled with a dual-regulator power architecture (MR/LPR) that dynamically selects between main and low-power regulators per operating mode. Its Cortex-M0+ core includes MPU support and deterministic NVIC interrupt handling.

Analog subsystems operate on independent supplies: VDDA powers the 12-bit ADC, DAC, OPAMP, and comparators, while VDDUSB (3.0–3.6 V) isolates USB transceivers. The device implements three tamper-detection pins and five passive anti-tamper inputs for secure boot and runtime integrity monitoring.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant and ECOPACK2 certified, with exposed thermal pad for enhanced thermal dissipation in sealed enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L073RZT6 and RA4M2G20FNE20, the STM32U073CBT6 uniquely combines crystal-less USB, LCD driver, and <100 nA ultra-low-power modes - making it optimal for space- and energy-constrained HMI endpoints where analog integration reduces BoM count.

Availability

STM32U073CBT6 is available at Aetrix Electronics and suitable for smart utility meters, portable medical sensors, industrial wireless nodes, and home appliance control panels requiring stable component supply across extended product lifecycles.

Supply support for STM32U073CBT6 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-grade components since 1987.

The STM32U0 series targets ultra-low-power embedded applications demanding sub-100 nA shutdown current, integrated analog peripherals, and secure firmware execution - specifically optimized for battery-powered IoT edge nodes and portable human-interface devices.

FAQ

What is the maximum operating temperature range for STM32U073CBT6?

The STM32U073CBT6 is qualified for ambient operation from –40 °C to +125 °C, with junction temperature up to +130 °C. This rating is validated per JEDEC JESD47 and applies across all low-power modes, including VBAT operation with RTC enabled - critical for deployment in automotive under-hood or industrial motor-control environments.

Does STM32U073CBT6 support true random number generation?

Yes - it integrates a hardware TRNG compliant with NIST SP 800-90B entropy requirements, delivering statistically validated random bits at up to 10 Mbit/s. The TRNG output feeds the secure boot ROM and can be accessed via RCC clock-gating and RNG peripheral registers - used for session key derivation in TLS handshakes and firmware signature verification.

How many GPIOs are 5 V-tolerant on the LQFP48 package?

The STM32U073CBT6 in LQFP48 provides 33 5 V-tolerant GPIOs across PA, PB, PC, and PD ports. These pins tolerate up to 5.5 V regardless of VDD level (1.71–3.6 V), enabling direct connection to legacy 5 V peripherals like UART transceivers, optocouplers, or LED drivers without external level-shifting circuitry.

Can the internal voltage reference buffer (VREFBUF) drive external ADCs?

No - the VREFBUF is designed exclusively for internal analog peripherals (ADC, DAC, OPAMP, comparators). Its output (VREF+) is routed internally or to the dedicated VREF+ pin; it lacks the drive strength or stability specifications required for external precision ADC reference applications. External references must be connected directly to VREF+ pin if used.