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Home > Products > Integrated Circuits (ICs) > Embedded > Microcontrollers

STMicroelectronics STM32U535RET6QTR

Name: STM32U535RET6QTR
Brand: STMicroelectronics
SKU: STM32U535RET6QTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM32U535RET6QTR

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 64-LQFP

Datasheet:: STM32U535RET6QTR.pdf

Description:: IC MCU 32BIT 512KB FLASH 64LQFP

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Product details

Overview

STM32U535RET6QTR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M33 microcontroller with TrustZone® security, 512 KB flash, 274 KB SRAM, and integrated FPU-designed for secure, battery-constrained IoT edge nodes requiring real-time sensor fusion, cryptographic operations, and sub-μA sleep modes. It delivers 240 DMIPS at 160 MHz and supports LPBAM for autonomous peripheral operation down to Stop 2 mode.

For engineers reviewing the STM32U535RET6QTR datasheet, STM32U535RET6QTR pinout, STM32U535RET6QTR application, or STM32U535RET6QTR equivalent, key selection criteria include verified TrustZone-enabled secure boot flow, measured 90 nA Shutdown current with 23 wake-up pins, 14-bit 2.5-Msps ADC with hardware oversampling, CAN FD controller compliance, and LQFP64 (10 × 10 mm) package compatibility with industrial temperature range (–40 °C to +125 °C).

Technical Context

The device implements a dual-bank flash architecture with ECC and read-while-write capability, enabling seamless firmware updates without runtime interruption. Its ART Accelerator includes 8-Kbyte instruction cache and 4-Kbyte data cache, supporting zero-wait-state execution from flash and external memories up to 160 MHz.

Power management integrates both LDO and SMPS step-down converter with on-the-fly switching and voltage scaling, while low-power modes are orchestrated via FlexPowerControl-enabling 370 nA Standby with RTC, 1.4 μA Stop 3 with 16-Kbyte SRAM retention, and LPBAM-driven DMA-triggered peripheral chains that operate autonomously in Stop 2.

Key Specifications

Parameter	Value and Actual Design Meaning
CPU Core	Arm Cortex-M33 with TrustZone, MPU, DSP, and single-precision FPU-enables secure, deterministic real-time control with hardware-isolated secure/non-secure worlds.
Max Clock / Performance	160 MHz / 240 DMIPS-achieved via ART Accelerator with 8-KB instruction cache; enables high-throughput signal processing in resource-constrained edge devices.
Memory	512 KB flash (ECC, 2-bank RWW), 274 KB SRAM (up to 64 KB with ECC)-supports robust firmware integrity, over-the-air updates, and large buffer storage for sensor aggregation.
Low-Power Modes	90 nA Shutdown, 370 nA Standby with RTC, 1.4 μA Stop 3 (16 KB SRAM)-validates suitability for 10+ year battery life in wireless sensor nodes and metering applications.
Analog Peripherals	14-bit 2.5-Msps ADC (hardware oversampling), dual 12-bit DAC, OPAMP with PGA, ultra-low-power comparator-enables precision analog front-end for industrial sensing without external signal conditioning.
Security Features	TrustZone, secure boot with unique entry, HDP, 512-byte OTP, HASH accelerator, NIST SP800-90B-compliant TRNG-meets PSA Level 3 and SESIP certification prerequisites for connected medical and smart utility endpoints.
Communication	1 CAN FD, 4 I²C FM+, 5 USART/LPUART, 1 USB FS host/device, OCTOSPI, SDMMC-supports mixed wired/wireless connectivity stacks including CAN-based vehicle diagnostics and cellular modem coexistence.

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK2 certified; suitable for reflow soldering and industrial PCB assembly.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VSS	Core power supply and ground	Supports 1.71–3.6 V operation; decoupling required per datasheet layout guidelines to maintain 160 MHz stability and low-noise ADC performance.
VDDA, VSSA	Analog domain supply and ground	Independent 1.62–3.6 V rail for ADC/DAC/OPAMP; enables precise analog measurement even during digital core voltage scaling.
NRST	Active-low reset input	Asynchronous reset with internal pull-up; compatible with external push-button or supervisor IC assertion; initiates secure boot sequence when TrustZone enabled.
PA0–PA15, PB0–PB15, etc.	General-purpose I/Os	Up to 82 fast I/Os; most 5V-tolerant, 14 with independent 1.08–3.6 V supply-enables direct interfacing with legacy sensors, displays, and level-shifted buses.
PC13–PC15	RTC oscillator inputs	Dedicated LSE pins for 32.768 kHz crystal; supports hardware calendar, tamper detection, and VBAT-powered backup registers across all low-power modes.
PD0–PD1	USART2 TX/RX	Default async serial interface; supports LIN, IrDA, modem protocols; LPUART variant available on PA2/PA3 for sub-μA wake-up communication.
PF9–PF15	OCTOSPI I/Os	Octal SPI interface for high-speed external memory (XIP or execute-in-place); enables expansion beyond on-chip flash while maintaining deterministic latency.

Key Features

Feature	Design Value
LPBAM (Low-Power Background-Autonomous Mode)	Enables DMA-driven peripheral chains (e.g., ADC → DMA → AES → SRAM) to execute without CPU intervention-even in Stop 2 mode-reducing active time and extending battery life.
FlexPowerControl with SMPS + LDO	Dynamic switching between SMPS (high-efficiency) and LDO (low-noise) based on operating mode and load, optimizing power delivery for mixed-signal workloads.
CORDIC + FMAC co-processors	Hardware acceleration for trigonometric (sine/cosine/tan) and filter (IIR/FIR) computations-offloads CPU for motor control, audio preprocessing, and sensor fusion algorithms.
Secure Firmware Installation (SFI)	Root-secure services (RSS) enable authenticated, encrypted firmware loading into protected flash regions-eliminates need for external secure elements in cost-sensitive designs.
Multi-Function Digital Filter (MDF)	Two independent digital filters support simultaneous sound-activity detection and noise suppression-ideal for voice-controlled edge devices with always-on listening capability.

Applications

Smart Utility Metering

Wearable Health Monitor

Use Scenario: Battery-powered gas/water meter with ultrasonic flow sensing, RF mesh backhaul, and tamper detection.

IC Role / Device Role / Timing Role: Main MCU executing metrology algorithms, managing secure OTA updates, and coordinating LPBAM-triggered ADC sampling and crypto signing in Stop 2 mode.

Use Value: 90 nA Shutdown current extends 15-year battery life; TrustZone isolates metrology firmware from RF stack; CAN FD supports field diagnostic bus.

Use Scenario: ECG/PPG patch with continuous biosignal acquisition, motion artifact correction, and Bluetooth LE telemetry.

IC Role / Device Role / Timing Role: Sensor hub aggregating analog front-end data, running CORDIC-based QRS detection, and managing secure BLE pairing via TF-M.

Use Value: 14-bit ADC with hardware oversampling achieves <1 µV RMS noise floor; 370 nA Standby with RTC enables daily sync without draining coin cell; MDF performs real-time motion filtering.

Industrial Predictive Maintenance Node

Secure Smart Lock Controller

Use Scenario: Vibration and temperature sensor node on rotating machinery, transmitting FFT features via LoRaWAN.

IC Role / Device Role / Timing Role: Real-time vibration analysis engine using FMAC for spectral decomposition, with secure firmware update via SFI and tamper-evident logging.

Use Value: 240 DMIPS enables on-device FFT computation at 10 kHz sample rate; VBAT mode preserves calibration data during main power loss; 512-byte OTP stores device-specific keys.

Use Scenario: Battery-operated door lock with fingerprint reader, NFC authentication, and anti-tamper enclosure monitoring.

IC Role / Device Role / Timing Role: Secure root-of-trust controller managing biometric template storage in HDP, validating NFC commands in secure world, and driving solenoid via advanced timers.

Use Value: TrustZone enforces strict isolation between fingerprint processing and BLE/NFC stacks; 16.3 μA Stop 3 mode maintains responsiveness; active tampers trigger immediate erase of sensitive keys.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STM32U575RIT6Q	Higher flash (2 MB), larger SRAM (1 MB), dual-core Cortex-M33 option, enhanced crypto accelerators (AES-GCM, PKA)	Targeted at complex secure gateways and AI-edge inference; requires more PCB area and higher BOM cost	Select when >1 MB code size or hardware PKA for ECDSA/ECDH is required; not drop-in due to pin count (LQFP100 vs LQFP64) and voltage regulator differences.
NXP LPC55S69JBD100	Arm Cortex-M33 with TrustZone, 640 KB flash, 320 KB SRAM, no SMPS, lower max clock (150 MHz), different peripheral mix (no OCTOSPI, no MDF)	Better suited for USB-C PD controllers and audio-centric applications; lacks LPBAM and ultra-low-power analog features	Choose for USB-focused designs needing integrated USB PHY; avoid where sub-μA Stop modes or hardware-accelerated sensor fusion are critical.

Compared with STM32U535RET6QTR, the STM32U575RIT6Q offers greater memory and crypto throughput at the expense of footprint and power efficiency, while the LPC55S69JBD100 trades ultra-low-power analog integration and LPBAM for stronger USB subsystem integration-making STM32U535RET6QTR optimal for compact, long-life, sensor-dense secure edge nodes.

Availability

STM32U535RET6QTR is available at Aetrix Electronics and suitable for smart metering, wearable health monitors, industrial predictive maintenance nodes, and secure smart lock controllers requiring stable component supply across multi-year production cycles.

Supply support for STM32U535RET6QTR 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, reliability, and security.

The STM32U5 series is ST's flagship ultra-low-power secure MCU product line, designed specifically for battery-operated IoT endpoints demanding PSA Certified Level 3 security, sub-μA sleep currents, and hardware-accelerated real-time signal processing-all within compact LQFP and WLCSP packages.

FAQ

What is the maximum operating temperature rating for STM32U535RET6QTR?

The STM32U535RET6QTR is qualified for industrial operation from –40 °C to +125 °C ambient temperature. This extended range is validated per JEDEC JESD22-A108 and supported by on-die temperature sensor calibration across the full span, enabling reliable deployment in harsh environments such as smart meters and motor drives.

Does STM32U535RET6QTR support true hardware-based secure boot?

Yes. The device implements a hardware-enforced secure boot chain starting from ROM-based first-stage bootloader (FSBL), verifying signed firmware images using public-key cryptography before loading into secure flash. Root of trust is anchored in immutable boot entry and secured by HDP and RDP protection levels, meeting PSA Certified Level 3 requirements.

Can the OCTOSPI interface be used for XIP (execute-in-place) operation?

Yes. OCTOSPI supports XIP mode with configurable latency and wrap behavior, allowing code execution directly from external octal-SPI NOR flash. The ART Accelerator's 4-Kbyte data cache further reduces access latency, enabling deterministic real-time response comparable to on-chip flash execution.

How many independent power domains does STM32U535RET6QTR support?

The MCU features three independent power domains: VDD/VSS (digital core), VDDA/VSSA (analog), and VBAT (backup). Each domain has dedicated regulators, supervisors, and retention capabilities-enabling simultaneous operation of RTC, backup registers, and ultra-low-power comparators while the core remains in Shutdown mode.

STM32U535RET6QTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 64-LQFP

Series:: STM32U5

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: -

Core Processor:: ARM® Cortex®-M33

Core Size:: 32-Bit

Speed:: 160MHz

Connectivity:: CANbus, I2C, IrDA, LINbus, SAI, SmartCard, SPDIF, SPI, UART/USART, USB

Peripherals:: Brown-out Detect/Reset, DMA, Motor Control PWM, POR, PWM, WDT

Number of I/O:: 47

Program Memory Size:: 512KB (512K x 8)

Program Memory Type:: FLASH

EEPROM Size:: -

RAM Size:: 274K x 8

Voltage - Supply (Vcc/Vdd):: 1.71V ~ 3.6V

Data Converters:: A/D 15x12/14b SAR; D/A 2x12b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

STM32U535RET6QTR FAQ

1.How can I place an order for STM32U535RET6QTR through Aetrix?

Please submit a Request for Quotation (RFQ) for STM32U535RET6QTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STM32U535RET6QTR reliable?

The price and inventory of STM32U535RET6QTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32U535RET6QTR is usually 5 days.

3.What payment methods are accepted for STM32U535RET6QTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32U535RET6QTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM32U535RET6QTR?

STM32U535RET6QTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM32U535RET6QTR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STM32U535RET6QTR?

For technical support, including STM32U535RET6QTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32U535RET6QTR requirements.

6.How does Aetrix verify that STM32U535RET6QTR is sourced from the original manufacturer or authorized distributors?

All STM32U535RET6QTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32U535RET6QTR meets industry standards.

7.What is the process for return or replacement of STM32U535RET6QTR?

All STM32U535RET6QTR units undergo pre-shipment inspection (PSI). If there is an issue with STM32U535RET6QTR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STM32U535RET6QTR part is unused and in its original packaging.

Return procedure for STM32U535RET6QTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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