STMicroelectronics STM32U073HBY6TR

Overview

STM32U073HBY6TR 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 operation in portable medical sensors and wireless IoT edge nodes.

For engineers reviewing the STM32U073HBY6TR datasheet, STM32U073HBY6TR pinout, STM32U073HBY6TR application, or STM32U073HBY6TR equivalent, key selection criteria include verified shutdown current (16 nA), Stop 2 mode power (695 nA without RTC), 12-bit ADC conversion time (0.4 µs), LCD driver capability (8×48 segments), and WLCSP42 package compatibility with space-constrained wearable designs.

Technical Context

The device integrates an ART Accelerator enabling 0-wait-state execution from flash at 56 MHz, coupled with a dual-regulator power system (MR/LPR) that dynamically selects between main and low-power regulators based on active mode - reducing run-mode current to 52 μA/MHz. Its analog subsystem uses independent VDDA supply (1.62–3.6 V) for ADC, DAC, OPAMP, and comparators, ensuring signal integrity in mixed-signal sensing applications.

Security architecture includes Arm® PSA Level 1 and SESIP Level 3 candidate certification, robust RDP with 128-bit password-based regression, hardware TRNG, and five passive anti-tamper pins - supporting secure boot and firmware update in industrial control endpoints where tamper resistance is mandated.

Key Specifications

Pinout & Package

STM32U073HBY6TR is housed in a 42-ball WLCSP (Wafer-Level Chip-Scale Package) measuring 2.82 × 2.93 mm with 0.4 mm ball pitch, optimized for ultra-compact PCB layouts and automated assembly in high-volume consumer electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L073RZT6 and RA4M2N20FNEA, the STM32U073HBY6TR uniquely combines crystal-less USB, 130 nA VBAT RTC, and 8×48 LCD drive in a 2.82 mm × 2.93 mm WLCSP - making it the only option for miniaturized, battery-backed USB-connected displays requiring >10-year operational lifetime.

Availability

STM32U073HBY6TR is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, wearable health trackers, and industrial wireless sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for STM32U073HBY6TR 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 <100 nA shutdown current, integrated USB, and LCD support - specifically engineered for battery-operated medical, metering, and wearable devices where size, longevity, and regulatory compliance are critical.

FAQ

What is the minimum supply voltage for reliable operation of STM32U073HBY6TR?

The device operates reliably from 1.71 V to 3.6 V on VDD. Below 1.71 V, brownout reset (BOR) activates to prevent undefined behavior; the internal LDO regulator maintains stable VCORE even under transient voltage dips, ensuring consistent flash/SRAM access down to the specified threshold.

Does STM32U073HBY6TR support true hardware encryption acceleration?

No hardware AES or SHA accelerator is integrated. Security relies on software libraries leveraging the Arm TrustZone-compatible MPU, secure boot enforcement, and TRNG output for key derivation - sufficient for PSA Level 1 but not for high-throughput encrypted communication.

Can the WLCSP42 package be reflow soldered using standard lead-free profiles?

Yes - the WLCSP42 package is qualified for JEDEC J-STD-020D-compliant reflow profiles with peak temperature ≤260 °C. ST recommends using solder paste with particle size ≤25 µm and controlled stencil aperture to ensure reliable ball attachment and minimize voiding in thermal pads.

How many GPIOs are accessible in the WLCSP42 variant of STM32U073HBY6TR?

The WLCSP42 package provides 33 GPIOs, including 4 dedicated wakeup pins. This count matches the STM32U073Hx designation in Table 1 of DS14548 Rev 2, confirming full functional alignment with the H-series pinout and peripheral enablement.