STMicroelectronics STM32U545NEY6QTR

Overview

STM32U545NEY6QTR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M33 microcontroller with TrustZone® security, 512 KB flash, 274 KB SRAM, and hardware crypto accelerators (AES, PKA, HASH, RNG). It delivers 240 DMIPS at up to 160 MHz, supports LPBAM autonomous peripheral operation down to Stop 2 mode, and targets secure, battery-constrained IoT edge nodes requiring certified firmware integrity and real-time sensor processing.

For engineers reviewing the STM32U545NEY6QTR datasheet, STM32U545NEY6QTR pinout, STM32U545NEY6QTR application, or STM32U545NEY6QTR equivalent, key selection criteria include ULPMark™-CP/PP scores (464/125), TrustZone-enabled memory partitioning, Octo-SPI on-the-fly decryption, and dual 14-/12-bit ADCs with autonomous Stop 2 operation - all validated for PSA Level 3 and SESIP3 certification.

Technical Context

The device integrates an Arm Cortex-M33 core with MPU, FPU, and TrustZone®, enabling secure execution environments with hardware-enforced isolation between secure/non-secure worlds. Its ART Accelerator includes 8-KB instruction cache and 4-KB data cache, enabling zero-wait-state execution from flash and external memories at 160 MHz.

Power architecture combines embedded LDO and SMPS step-down converter with dynamic voltage scaling and switch-on-the-fly capability. Low-power modes are rigorously defined: 90 nA Shutdown, 370 nA Standby with RTC, and 1.4 µA/MHz Run mode @ 3.3 V - all verified across –40 °C to +125 °C operating range.

Key Specifications

Pinout & Package

STM32U545NEY6QTR is packaged in a 48-pin UFQFPN (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad. This compact, lead-free ECOPACK2-compliant package supports high-density PCB layouts and efficient thermal dissipation in space-constrained industrial and wearable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32U545NEY6QTR, the STM32U575 offers greater memory headroom but sacrifices compactness and camera interface; the LPC55S69 trades hardware security assurance for flexibility, requiring additional software validation to match STM32U5's out-of-box PSA Level 3 readiness.

Availability

STM32U545NEY6QTR is available at Aetrix Electronics and suitable for smart utility meters, industrial predictive maintenance sensors, medical wearables, and secure edge gateways requiring stable component supply, long-term lifecycle support, and certified security functionality.

Supply support for STM32U545NEY6QTR 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 semiconductors since 1987.

The STM32U5 series targets ultra-low-power, security-critical edge applications - combining Arm TrustZone, PSA-certified crypto, and industry-leading energy efficiency to enable next-generation IoT endpoints with zero-trust architecture.

FAQ

What is the maximum operating temperature rating for STM32U545NEY6QTR?

The STM32U545NEY6QTR is rated for operation from –40 °C to +125 °C ambient temperature, validated per DS14216 Rev 5 specifications. This extended grade supports deployment in harsh industrial environments such as motor drives, solar inverters, and automotive under-hood telemetry modules where thermal stability is critical.

Does STM32U545NEY6QTR support external memory interfaces beyond Octo-SPI?

No - the device supports only one Octo-SPI interface (OCTOSPI1) for external memory expansion. It does not include Quad-SPI, HyperBus, or parallel NOR/NAND controllers. External code execution is enabled exclusively via OCTOSPI with hardware on-the-fly decryption (OTFDEC) for secure XIP from external flash.

How many independent power domains does the STM32U545NEY6QTR support?

The device implements three independent power domains: VDD/VSS (core logic), VDDA/VSSA (analog peripherals), and VBAT (backup domain). Each has dedicated regulators and monitoring - enabling simultaneous operation of ADCs, RTC, and core logic while minimizing cross-domain noise coupling and leakage.

Is the 96-bit unique ID accessible to non-secure firmware?

No - the 96-bit unique ID is readable only from the secure world after successful secure boot. Non-secure firmware receives a masked or derived identifier via secure services (RSS), preserving device identity confidentiality and preventing cloning or unauthorized provisioning in fleet management systems.