STMicroelectronics STM32U545RET6Q

Overview

STM32U545RET6Q from STMicroelectronics is an ultra-low-power Arm® Cortex®-M33 microcontroller with TrustZone® security, 512 KB flash, 274 KB SRAM, and hardware crypto accelerators including dual AES engines and PKA. It operates from 1.71 V to 3.6 V across –40 °C to +85 °C, delivers 240 DMIPS at up to 160 MHz, and supports autonomous low-power background operation (LPBAM) down to Stop 2 mode - deployed in battery-powered industrial sensors and secure IoT edge nodes.

For engineers reviewing the STM32U545RET6Q datasheet, STM32U545RET6Q pinout, STM32U545RET6Q application, or STM32U545RET6Q equivalent, key selection criteria include TrustZone-enabled secure boot, sub-µA Stop 3 current (1.4 µA with 16-Kbyte SRAM), Octo-SPI on-the-fly decryption, ULPMark™-CP score of 464, and LQFP64 package compatibility with existing STM32U5 layout footprints.

Technical Context

The STM32U545RET6Q implements a dual-cache Arm Cortex-M33 core (8-Kbyte instruction cache, 4-Kbyte data cache) enabling zero-wait-state execution from flash at 160 MHz. Its FlexPowerControl architecture integrates SMPS step-down converter and LDO, supporting dynamic voltage scaling and switch-on-the-fly mode transitions between regulators.

Security is architected via Arm TrustZone®, securable I/Os/peripherals, Root of Trust with unique boot entry and HDP, and PSA Level 3/SESIP3-certified assurance. Cryptographic acceleration includes DPA-resistant AES coprocessors, public key accelerator (PKA), HASH, TRNG (NIST SP800-90B compliant), and OTFDEC for external Octo-SPI memory decryption.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad - optimized for thermal dissipation in compact industrial PCBs and compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32U575RIT6 and KW38Z168VHT4, the STM32U545RET6Q uniquely balances ultra-low static power (90 nA), PSA Level 3 security certification, and Octo-SPI expandability - making it optimal for cost-sensitive, battery-constrained, and externally memory-dependent secure edge nodes.

Availability

STM32U545RET6Q is available at Aetrix Electronics and suitable for smart utility metering, secure industrial gateways, wearable health monitors, and asset tracking beacons requiring stable component supply, long-term lifecycle assurance, and full traceability.

Supply support for STM32U545RET6Q 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 ICs, sensors, and automotive-grade components since 1987.

The STM32U5 series targets ultra-low-power, security-critical embedded applications - delivering PSA-certified TrustZone, sub-µA power states, and hardware crypto acceleration for next-generation IoT and industrial edge devices.

FAQ

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

The STM32U545RET6Q achieves 160 MHz maximum clock frequency with 16.3 µA/MHz current draw at 3.3 V in Run mode. This equates to approximately 2.6 mA total core current at full speed, validated per DS14216 Rev 5 Section 5.3.6. The ART Accelerator and dual caches eliminate wait states, maintaining this efficiency across flash and external memory accesses.

Does STM32U545RET6Q support external memory interfaces beyond Octo-SPI?

No - the STM32U545RET6Q supports only one Octo-SPI interface (OCTOSPI1) for external memory expansion. It does not include FSMC, Quad-SPI, or parallel NOR/NAND controllers. External code/data must use Octo-SPI x1/x2/x4/x8 modes, with on-the-fly decryption (OTFDEC) supported for encrypted flash images.

How many independent power domains does the device feature for analog peripherals?

The STM32U545RET6Q features three independent analog power domains: VDDA/VSSA for ADC/DAC/OPAMP/COMP, VREF+ for voltage reference buffer, and VBAT for RTC and backup registers. Each has dedicated filtering and decoupling requirements specified in Section 5.1.6 and Figure 13 of DS14216 Rev 5 to ensure <±1 LSB linearity and low-noise operation.

Is the LQFP64 package of STM32U545RET6Q RoHS and REACH compliant?

Yes - the STM32U545RET6Q in LQFP64 (10 × 10 mm) meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. It is also ECOPACK2 certified, confirming lead-free terminations, halogen-free molding compound, and compliance with ST's environmental product stewardship program as stated in the device summary table (page 2) and Package Information section (page 280).