STM32U545RET6 - Ultra-Low-Power Cortex-M33 MCU | STMicroelectronics
MPN: STM32U545RET6 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.5 | $5,500.00 |
Drop-in alternatives for STM32U545RET6 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
STM32U545RET6Q
β Drop-Inπ Reference alternative (not in catalog)
STM32U545RCT6
β Drop-Inπ Reference alternative (not in catalog)
STM32U545RGT6
β Drop-Inπ Reference alternative (not in catalog)
GD32U545RET6
β Drop-Inπ Reference alternative (not in catalog)
STM32U545RET6 Maximum Ratings & Electrical Characteristics
| Core | Arm Cortex-M33 with TrustZone and FPU |
| Maximum Clock Frequency | 160 MHz |
| Flash Memory | 512 KB |
| SRAM | 274 KB |
| Data Bus Width | 32-bit |
| Package | 64-LQFP (10x10 mm) |
| Operating Voltage Range | 1.71 V to 3.6 V |
| Operating Temperature Range | -40Β°C to +85Β°C |
| Number of I/O Pins | 52 |
| DMA Channels | 16 |
| ADC Resolution | 12-bit |
| DAC Resolution | 12-bit |
| Communication Interfaces | USART, SPI, I2C, USB, SAI, FDCAN |
| Cryptographic Acceleration | AES, RSA, ECC, TRNG |
| RoHS Status | Compliant |
STM32U545RET6 Pin Configuration
| Pin 1 | VBAT β Backup battery supply |
| Pin 2 | PC13 β GPIO / RTC output |
| Pin 3 | PC14 β GPIO / OSC32_IN |
| Pin 4 | PC15 β GPIO / OSC32_OUT |
| Pin 5 | PF0 β GPIO |
| Pin 6 | PF1 β GPIO |
| Pin 7 | NRST β Reset |
| Pin 8 | VDD β Digital power supply |
| Pin 9 | VSS β Ground |
| Pin 10 | PA0 β GPIO / ADC input |
| Pin 11 | PA1 β GPIO / ADC input |
| Pin 12 | PA2 β GPIO / USART2_TX |
| Pin 13 | PA3 β GPIO / USART2_RX |
| Pin 14 | PA4 β GPIO / DAC_OUT1 |
| Pin 15 | PA5 β GPIO / DAC_OUT2 |
| Pin 16 | PA6 β GPIO / SPI1_MISO |
| Pin 17 | PA7 β GPIO / SPI1_MOSI |
| Pin 18 | PB0 β GPIO / ADC input |
| Pin 19 | PB1 β GPIO / ADC input |
| Pin 20 | PB2 β GPIO / BOOT1 |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
STM32U545RET6 is suitable for 6 applications: Wearable Devices, Medical Monitoring Devices, Industrial Sensors, Secure IoT Nodes, Smart Home Controllers, Portable Test and Measurement.
Wearable Devices
The STM32U545RET6 is ideal for wearable devices such as smartwatches and fitness trackers due to its ultra-low-power modes and high performance. Its 160 MHz Cortex-M33 core can handle sensor fusion, display control, and wireless protocols while maintaining long battery life. The TrustZone security ensures secure storage of user data and credentials. In a typical smartwatch, the MCU interfaces with an accelerometer, heart rate sensor, and Bluetooth LE module, processing data in real-time. The low-power stop mode allows the device to remain in standby for extended periods, waking only on events. The 512 KB flash provides ample space for firmware and user data, while the 274 KB SRAM supports complex algorithms. The hardware crypto accelerator offloads encryption tasks, reducing CPU load and power consumption. Overall, the STM32U545RET6 enables feature-rich wearables with extended battery life.
Recommended
Medical Monitoring Devices
The STM32U545RET6 is well-suited for medical monitoring devices like portable ECG monitors and glucose meters. Its ultra-low-power operation is critical for battery-powered devices that need to run continuously. The Cortex-M33 core with FPU enables efficient signal processing for biosignal analysis. The TrustZone security protects patient data and ensures compliance with medical regulations. In a portable ECG monitor, the MCU reads analog signals from an ECG front-end, performs filtering and analysis, and displays results on an LCD. The 12-bit ADC provides sufficient resolution for accurate signal acquisition. The device's multiple communication interfaces allow data transfer to a smartphone or cloud for further analysis. The low-power modes enable long-term monitoring without frequent battery changes. The hardware crypto accelerator ensures secure transmission of medical data. The STM32U545RET6's combination of performance, security, and low power makes it an excellent choice for next-generation medical wearables.
Recommended
Industrial Sensors
The STM32U545RET6 is designed for industrial sensor applications such as condition monitoring and predictive maintenance. Its robust operating temperature range and low power consumption make it suitable for deployment in harsh environments. The MCU can interface with various sensors, including vibration, temperature, and pressure sensors, and process data locally to reduce network traffic. The 160 MHz Cortex-M33 core provides ample processing power for real-time analysis. The device's multiple UARTs and SPIs allow connection to industrial fieldbuses like Modbus. The TrustZone security ensures secure firmware updates and protects against cyber threats. In a vibration monitoring system, the MCU samples an accelerometer at high rates, performs FFT analysis, and transmits alerts when anomalies are detected. The low-power modes allow battery-powered operation for years. The STM32U545RET6's combination of performance, security, and reliability makes it a top choice for industrial IoT.
Recommended
Secure IoT Nodes
The STM32U545RET6 is an excellent choice for secure IoT nodes that require robust security and low power. Its TrustZone technology provides hardware isolation for secure boot and secure firmware updates. The hardware crypto accelerator supports AES, RSA, and ECC, enabling secure communication protocols like TLS. The device's ultra-low-power modes allow battery-powered operation for years. In a typical IoT node, the MCU collects data from sensors, encrypts it, and transmits it via a wireless module. The 512 KB flash can store firmware and security keys, while the 274 KB SRAM supports complex applications. The multiple communication interfaces allow connection to Wi-Fi, Bluetooth, or LoRa modules. The STM32U545RET6's security features meet the requirements of many IoT security standards, making it ideal for smart home, smart city, and industrial IoT applications.
Recommended
Smart Home Controllers
The STM32U545RET6 can serve as the central controller in smart home systems, managing lighting, HVAC, and security. Its high performance and rich peripheral set allow it to interface with various sensors and actuators. The TrustZone security ensures secure communication with cloud services and protects against unauthorized access. The device's low-power modes are beneficial for battery-powered devices like smart locks and thermostats. In a smart thermostat, the MCU reads temperature and humidity sensors, controls the HVAC system, and communicates with a mobile app via Wi-Fi. The 12-bit ADC provides accurate sensor readings, while the multiple timers and PWM outputs control actuators. The hardware crypto accelerator ensures secure data transmission. The STM32U545RET6's combination of performance, security, and low power makes it a versatile choice for smart home applications.
Recommended
Portable Test and Measurement
The STM32U545RET6 is suitable for portable test and measurement equipment such as handheld multimeters and data loggers. Its high-speed ADC and DMA capabilities enable accurate data acquisition. The low-power modes extend battery life, making it ideal for field use. The Cortex-M33 core with FPU supports complex signal processing algorithms. In a handheld multimeter, the MCU reads analog signals from a front-end, performs calculations, and displays results on an LCD. The 12-bit ADC provides sufficient resolution for most measurements. The device's multiple communication interfaces allow data logging to an SD card or transfer to a PC. The TrustZone security protects calibration data and firmware. The STM32U545RET6's combination of performance, low power, and security makes it a reliable choice for portable instruments.
Recommended
Recommended Products Summary
Engineering reference data for STM32U545RET6 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32U545RET6Q | STM32U545RCT6 | STM32U545RGT6 | GD32U545RET6 |
|---|---|---|---|---|---|
| Package | 64-LQFP (10x10 mm) | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | GigaDevice |
| Core | Arm Cortex-M33 | Arm Cortex-M33 | Arm Cortex-M33 | Arm Cortex-M33 | Arm Cortex-M33 |
| Max Clock Frequency | 160 MHz | 160 MHz | 160 MHz | 160 MHz | 160 MHz |
| Flash Memory | 512 KB | 512 KB | 256 KB | 1 MB | 512 KB |
| SRAM | 274 KB | 274 KB | 274 KB | 274 KB | [DATA_NEEDED] |
| TrustZone | Yes | Yes | Yes | Yes | Yes |
| Crypto Acceleration | AES, RSA, ECC, TRNG | AES, RSA, ECC, TRNG | AES, RSA, ECC, TRNG | AES, RSA, ECC, TRNG | [DATA_NEEDED] |
Key Differentiators
- Ultra-low-power with 160 MHz performance (vs STM32U545RCT6)
- TrustZone security (vs GD32U545RET6)
- Hardware crypto acceleration (vs STM32U545RGT6)
Design Notes
The STM32U545RET6 operates from 1.71V to 3.6V. Use a low-dropout regulator (LDO) to provide a stable supply, and place 100nF decoupling capacitors close to each VDD pin. For battery-powered designs, utilize the low-power modes (sleep, stop, standby) to minimize current consumption. The datasheet provides typical current values for each mode; for example, standby current is in the microamp range. Ensure the power supply can handle peak currents during flash programming or radio transmission.
For the 64-pin LQFP package, ensure proper PCB layout with a solid ground plane. Place the crystal oscillator (if used) close to the OSC_IN/OSC_OUT pins and keep traces short. Use via stitching around the ground pad to improve thermal performance. The datasheet provides layout guidelines for the LQFP package, including recommended pad sizes and solder paste stencil design. Follow these to ensure reliable soldering and avoid short circuits.
A common pitfall is neglecting the backup battery (VBAT) pin. If not used, connect VBAT to VDD. Also, ensure the NRST pin is properly pulled up with a 100nF capacitor to ground to avoid spurious resets. When using TrustZone, configure the security settings correctly to avoid locking out debug access. The STM32CubeMX tool can help generate the correct initialization code.
Compliance Information
RoHS compliant per STMicroelectronics product page. AEC-Q100 not applicable for this non-automotive grade device.
