STMicroelectronics STM32U073HCY6TR

Overview

STM32U073HCY6TR 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, USB 2.0 full-speed crystal-less interface, and integrated LCD controller supporting 8×48 segments. It delivers 407 ULPMark™-CP and operates from 1.71 V to 3.6 V across –40 °C to 125 °C ambient temperature - deployed in battery-powered medical sensors and portable industrial monitors.

For engineers reviewing the STM32U073HCY6TR datasheet, STM32U073HCY6TR pinout, STM32U073HCY6TR application, or STM32U073HCY6TR 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), ART Accelerator enabling 0-wait-state execution at 56 MHz, and WLCSP42 package compatibility with space-constrained wearable designs.

Technical Context

The STM32U073HCY6TR implements a dual-regulator power architecture: main regulator (MR) for Run/Sleep/Stop 0, low-power regulator (LPR) for Stop 1/2 and Low-power Run modes - enabling sub-µA retention in Stop 2 (695 nA) and 4 µs wake-up latency. Its ART Accelerator uses instruction prefetch and branch cache to eliminate flash wait states at 56 MHz.

It integrates independent analog supplies (VDDA for ADC/DAC/OPAMP, VDDUSB for USB transceivers, VBAT for RTC/backup registers), supports 5 passive anti-tamper pins, and includes a 96-bit unique ID plus true random number generation candidate for NIST SP 800-90B certification - all under Arm® PSA Level 1 and SESIP Level 3 security alignment.

Key Specifications

Pinout & Package

STM32U073HCY6TR is housed in a WLCSP42 (2.82 × 2.93 mm) package with 42-ball layout, optimized for ultra-compact wearable and implantable applications. Ball pitch is 0.4 mm; package complies with ECOPACK2 environmental standards.

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 EFM32PG12B500F1024GL125, the STM32U073HCY6TR uniquely combines crystal-less USB, integrated LCD driver, and industry-leading 695 nA Stop 2 mode - making it optimal for space- and energy-constrained human-interface devices requiring direct display and wired/wireless data upload.

Availability

STM32U073HCY6TR is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial handheld terminals, and wearable health trackers requiring stable component supply, long-term lifecycle assurance, and ECOPACK2-compliant packaging.

Supply support for STM32U073HCY6TR 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, delivering silicon solutions for automotive, industrial, and consumer markets with emphasis on energy efficiency and embedded intelligence.

The STM32U0 series targets ultra-low-power, cost-sensitive edge nodes - designed specifically for battery-operated devices needing robust security, analog integration, and minimal bill-of-materials without sacrificing Arm ecosystem compatibility.

FAQ

What is the maximum operating temperature range for STM32U073HCY6TR?

The STM32U073HCY6TR is rated for ambient operation from –40 °C to +125 °C, with junction temperature up to +130 °C. This rating is validated per DS14548 Rev 2 and applies to all WLCSP42-packaged variants. The extended range enables deployment in engine bay sensors, solar inverters, and industrial motor controllers without external thermal derating.

Does STM32U073HCY6TR support crystal-less USB operation?

Yes - it integrates a crystal-less USB 2.0 full-speed PHY with internal 48 MHz HSI48 oscillator and clock recovery circuitry, eliminating the need for an external 48 MHz crystal or oscillator. This feature is confirmed in Section 2.2 of DS14548 and reduces BOM count and PCB area by one passive component and two load capacitors.

How many GPIOs are available in the WLCSP42 package?

The WLCSP42 package provides 33 GPIOs, including 4 dedicated wakeup pins. This count is specified in Table 1 (page 4) of DS14548 Rev 2 for STM32U073Hx devices. All 33 pins support 5 V tolerance when VDD ≥ 2.7 V, and 27 of them are mapped to capacitive sensing channels.

Is the internal voltage reference buffer (VREFBUF) available on WLCSP42?

No - the VREF+ pin is not exposed in the WLCSP42 package; therefore, the internal voltage reference buffer must remain disabled per DS14548 Section 3.6.1. Designers must route VDDA ≥ 2.4 V directly to analog peripherals or use an external reference if precise 2.048 V or 2.5 V is required for ADC/DAC operation.