STM32L552RET6 - 110MHz Arm Cortex-M33 MCU with TrustZone | STMicroelectronics
MPN: STM32L552RET6 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 | $5.44 | $5,440.00 |
Drop-in alternatives for STM32L552RET6 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:
STM32L552RCT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RET6Q
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RCT6Q
β Drop-Inπ Reference alternative (not in catalog)
STM32L552R8T6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RBT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RGT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RDT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RCT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552R8T6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RBT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RGT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RDT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RCT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552R8T6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RBT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RGT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RDT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RCT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552R8T6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RBT6
β Drop-Inπ Reference alternative (not in catalog)
STM32L552RET6 Maximum Ratings & Electrical Characteristics
| Core | Arm Cortex-M33 with TrustZone |
| Max Clock Frequency | 110 MHz |
| Flash Memory | 512 KB |
| SRAM | 256 KB |
| Supply Voltage | 1.71 V to 3.6 V |
| Operating Temperature | -40C to +85C |
| Package | LQFP-64 (10x10 mm) |
| GPIO Pins | 51 |
| ADC | 16-bit, 5 Msps, with hardware oversampling |
| DAC | 2x 12-bit |
| Timers | Advanced-control, general-purpose, basic, low-power |
| Communication Interfaces | I2C, SPI, USART, UART, LPUART, SAI, CAN, USB OTG FS, SDMMC |
| Security | TrustZone, TRNG, AES, RSA, ECC |
| Low-Power Modes | Sleep, Low-power run, Low-power sleep, Stop 0/1/2, Standby |
| Standby Current | 100 nA (with backup domain) |
| RoHS Status | Compliant |
STM32L552RET6 Pin Configuration
| Pin 1 | VBAT β Backup battery supply |
| Pin 2 | PC13 β GPIO / RTC tamper |
| Pin 3 | PC14 β GPIO / OSC32_IN |
| Pin 4 | PC15 β GPIO / OSC32_OUT |
| Pin 5 | PF0 β GPIO / OSC_IN |
| Pin 6 | PF1 β GPIO / OSC_OUT |
| Pin 7 | NRST β Reset (active low) |
| Pin 8 | VDD β Digital power supply |
| Pin 9 | VSS β Ground |
| Pin 10 | VDDA β Analog power supply |
| Pin 11 | PA0 β GPIO / ADC / TIM2_CH1 |
| Pin 12 | PA1 β GPIO / ADC / TIM2_CH2 |
| Pin 13 | PA2 β GPIO / USART2_TX / ADC |
| Pin 14 | PA3 β GPIO / USART2_RX / ADC |
| Pin 15 | PA4 β GPIO / SPI1_NSS / DAC_OUT1 |
| Pin 16 | PA5 β GPIO / SPI1_SCK / DAC_OUT2 |
| Pin 17 | PA6 β GPIO / SPI1_MISO / TIM3_CH1 |
| Pin 18 | PA7 β GPIO / SPI1_MOSI / TIM3_CH2 |
| Pin 19 | PA8 β GPIO / MCO / TIM1_CH1 |
| Pin 20 | PA9 β GPIO / USART1_TX / TIM1_CH2 |
| Pin 21 | PA10 β GPIO / USART1_RX / TIM1_CH3 |
| Pin 22 | PA11 β GPIO / USB_DM / CAN_RX |
| Pin 23 | PA12 β GPIO / USB_DP / CAN_TX |
| Pin 24 | PA13 β GPIO / SWDIO |
| Pin 25 | PA14 β GPIO / SWCLK |
| Pin 26 | PA15 β GPIO / JTDI / TIM2_CH1 |
| Pin 27 | PB0 β GPIO / ADC / TIM3_CH3 |
| Pin 28 | PB1 β GPIO / ADC / TIM3_CH4 |
| Pin 29 | PB2 β GPIO / BOOT1 |
| Pin 30 | PB3 β GPIO / JTDO / SPI1_SCK |
| Pin 31 | PB4 β GPIO / JTRST / SPI1_MISO |
| Pin 32 | PB5 β GPIO / SPI1_MOSI / I2C1_SMBA |
| Pin 33 | PB6 β GPIO / I2C1_SCL / TIM4_CH1 |
| Pin 34 | PB7 β GPIO / I2C1_SDA / TIM4_CH2 |
| Pin 35 | PB8 β GPIO / I2C1_SCL / CAN_RX |
| Pin 36 | PB9 β GPIO / I2C1_SDA / CAN_TX |
| Pin 37 | PB10 β GPIO / I2C2_SCL / USART3_TX |
| Pin 38 | PB11 β GPIO / I2C2_SDA / USART3_RX |
| Pin 39 | PB12 β GPIO / SPI2_NSS / TIM1_BKIN |
| Pin 40 | PB13 β GPIO / SPI2_SCK / TIM1_CH1N |
| Pin 41 | PB14 β GPIO / SPI2_MISO / TIM1_CH2N |
| Pin 42 | PB15 β GPIO / SPI2_MOSI / TIM1_CH3N |
| Pin 43 | PC0 β GPIO / ADC / LPTIM1_IN1 |
| Pin 44 | PC1 β GPIO / ADC / LPTIM1_OUT |
| Pin 45 | PC2 β GPIO / ADC / LPTIM1_IN2 |
| Pin 46 | PC3 β GPIO / ADC / LPTIM1_IN3 |
| Pin 47 | PC4 β GPIO / ADC / I2S1_MCK |
| Pin 48 | PC5 β GPIO / ADC / I2S1_SCK |
| Pin 49 | PC6 β GPIO / TIM3_CH1 / SDMMC_CK |
| Pin 50 | PC7 β GPIO / TIM3_CH2 / SDMMC_CMD |
| Pin 51 | PC8 β GPIO / TIM3_CH3 / SDMMC_D0 |
| Pin 52 | PC9 β GPIO / TIM3_CH4 / SDMMC_D1 |
| Pin 53 | PC10 β GPIO / USART4_TX / SDMMC_D2 |
| Pin 54 | PC11 β GPIO / USART4_RX / SDMMC_D3 |
| Pin 55 | PC12 β GPIO / USART5_TX / SDMMC_CK |
| Pin 56 | PC13 β GPIO / RTC_TAMP1 |
| Pin 57 | PC14 β GPIO / OSC32_IN |
| Pin 58 | PC15 β GPIO / OSC32_OUT |
| Pin 59 | PD0 β GPIO / OSC_IN |
| Pin 60 | PD1 β GPIO / OSC_OUT |
| Pin 61 | PD2 β GPIO / TIM3_CH1 |
| Pin 62 | PD3 β GPIO / USART2_CTS |
| Pin 63 | PD4 β GPIO / USART2_RTS |
| Pin 64 | PD5 β GPIO / USART2_TX |
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
STM32L552RET6 is suitable for 6 applications: IoT Edge Devices, Smart Meters, Industrial Sensors, Medical Monitoring Devices, Secure Access Control, Wearable Devices.
IoT Edge Devices
The STM32L552RET6 is ideal for IoT edge devices due to its ultra-low-power modes and TrustZone security. In a typical smart sensor node, the MCU wakes from Stop mode to read sensors, process data, and transmit via LoRa or BLE. Its 110 MHz Cortex-M33 core handles complex protocols while the 100 nA standby current extends battery life. The integrated AES and TRNG enable secure communication and data encryption, making it suitable for secure cloud connectivity.
Recommended
Smart Meters
The STM32L552RET6 excels in smart metering applications, where it manages metering calculations, secure communication, and display updates. Its 16-bit ADC with hardware oversampling ensures accurate energy measurement, while the TrustZone technology protects metering data and firmware from tampering. The low-power modes allow the meter to run on battery for extended periods, and the multiple communication interfaces (UART, SPI, CAN) connect to various metering modules and communication modems.
Recommended
Industrial Sensors
In industrial sensor applications, the STM32L552RET6 provides high-performance processing for real-time data acquisition and control. Its 110 MHz core and FPU handle complex signal processing algorithms, while the multiple timers and ADCs interface with various sensors. The device's robust operating temperature range (-40Β°C to +85Β°C) and industrial-grade reliability make it suitable for factory automation and process control. The security features protect against unauthorized access and ensure data integrity.
Recommended
Medical Monitoring Devices
The STM32L552RET6 is well-suited for medical monitoring devices such as wearable health trackers and portable diagnostic equipment. Its ultra-low-power operation enables continuous monitoring on battery power, while the TrustZone security ensures patient data privacy and compliance with regulations. The integrated analog peripherals (ADC, DAC, comparators) interface with biosensors, and the FPU accelerates signal processing for heart rate or ECG analysis. The device's small LQFP-64 package allows compact device designs.
Recommended
Secure Access Control
The STM32L552RET6 is perfect for secure access control systems, including smart locks, biometric readers, and authentication devices. Its TrustZone technology provides a secure execution environment for cryptographic operations and secure storage of credentials. The device supports multiple authentication methods (fingerprint, RFID, PIN) through its rich peripheral set, and the low-power modes allow battery-powered locks to operate for years. The integrated AES and RSA accelerators ensure fast and secure authentication.
Recommended
Wearable Devices
The STM32L552RET6 is an excellent choice for wearable devices like smartwatches and fitness trackers. Its ultra-low-power modes, including a standby current of 100 nA, enable long battery life, while the 110 MHz Cortex-M33 core provides sufficient performance for user interfaces and sensor fusion. The device's small package and wide voltage range (1.71V to 3.6V) allow direct battery operation. The integrated security features protect user data and enable secure payments or health data transmission.
Recommended
Recommended Products Summary
Engineering reference data for STM32L552RET6 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32L552RCT6 | STM32L552RET6Q | STM32L552RGT6 |
|---|---|---|---|---|
| Package | LQFP-64 | LQFP-64 | LQFP-64 | LQFP-64 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Core | Arm Cortex-M33 with TrustZone | Arm Cortex-M33 with TrustZone | Arm Cortex-M33 with TrustZone | Arm Cortex-M33 with TrustZone |
| Max Clock Frequency | 110 MHz | 110 MHz | 110 MHz | 110 MHz |
| Flash Memory | 512 KB | 256 KB | 512 KB | 1 MB |
| SRAM | 256 KB | 128 KB | 256 KB | 256 KB |
| Automotive Grade | No | No | Yes (AEC-Q100) | No |
| Supply Voltage | 1.71V to 3.6V | 1.71V to 3.6V | 1.71V to 3.6V | 1.71V to 3.6V |
Key Differentiators
- TrustZone security with 512 KB flash (vs STM32L552RCT6)
- Automotive grade option available (vs STM32L552RET6Q)
- Higher memory than base variants (vs STM32L552R8T6)
Design Notes
For optimal power consumption, use the low-power modes appropriately. In Stop 2 mode, the device consumes around 3.4 uA with RTC and backup domain active. Ensure that the VDDA pin is decoupled with a 1 uF capacitor and a 100 nF capacitor to ground to maintain analog performance. The VDD pins should have a 100 nF capacitor each, and a 4.7 uF capacitor at the main power input.
Place decoupling capacitors as close as possible to the power pins. For the LQFP-64 package, use a 100 nF capacitor on each VDD pin and a 4.7 uF bulk capacitor near the power entry. The VDDA pin requires a dedicated 1 uF capacitor. Ensure a solid ground plane under the MCU to minimize noise and improve EMC performance.
When using TrustZone, ensure that the secure and non-secure memory regions are correctly configured in the SAU and MPU. Incorrect configuration can lead to hard faults. Also, the BOOT0 pin must be set correctly for the desired boot mode; a floating BOOT0 can cause unpredictable startup. Always connect the NRST pin with a 100 nF capacitor to ground for reliable reset.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified - choose STM32L552RET6Q for automotive.