STM32L552ZET6 - 110MHz Cortex-M33 512KB MCU | STMicroelectronics
MPN: STM32L552ZET6 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.42 | $7.42 |
| 10 | $6.68 | $66.80 |
| 100 | $5.95 | $595.00 |
| 500 | $5.36 | $2,680.00 |
| 1,000 | $4.82 | $4,820.00 |
STM32L552ZET6 Overview
A microcontroller (MCU) is a compact integrated circuit that combines a processor core, memory, and programmable peripherals on a single die to govern a dedicated embedded function. Within the system hierarchy, an MCU is an embedded processor, which belongs to the broader integrated-circuit family. The STM32L552ZET6 belongs to the STM32L5 series, STMicroelectronics' flagship ultra-low-power family, positioned above the STM32L4 series and below the STM32U5 series.
Key features include the ARMv8-M architecture with TrustZone hardware security isolation, a floating-point unit (FPU) and DSP instructions for efficient signal processing, 165 DMIPS of performance, and flexible power modes with consumption as low as 33 uA/MHz in Run mode and 0.29 uA in Standby mode. Peripherals include multiple USART/UART, SPI, I2C, CAN-FD, USB FS, SAI audio interfaces, a 12-bit ADC, a 12-bit DAC, and an integrated SMPS buck converter option in the family.
Technically, the device is fabricated on a 40 nm process and operates from a 1.71 V to 3.6 V supply. TrustZone enables secure boot, secure firmware update, and hardware-enforced separation of secure and non-secure software domains, which is essential for IoT devices subject to modern security requirements.
Typical applications include smart-home and IoT edge nodes, industrial sensors, wearable health monitors, and smart meters where secure communication and multi-year battery life are critical.
Design considerations: use STM32CubeMX for pin configuration and peripheral setup, decouple all VDD/VSS pairs with 100 nF capacitors, and select the MSI RC oscillator or an external crystal according to timing accuracy needs.
This page synthesizes distributor pricing, drop-in alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for STM32L552ZET6 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STM32L552ZET6 (same form factor and footprint) — differing in Core, Flash Memory, Operating Temperature, Run Mode Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
STM32L562ZET6
✅ Drop-In✓ In Stock
$7.1 / Unit
View Datasheet →STM32L552ZCT6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32L552ZEY6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32L552ZET6 Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M33 with TrustZone and FPU |
| Core Size | 32-bit |
| Maximum Clock Frequency | 110 MHz |
| Performance | 165 DMIPS |
| Flash Memory | 512 KB (512K x 8) |
| SRAM | 256 KB |
| Supply Voltage Range | 1.71 V to 3.6 V |
| Run Mode Current | 33 uA/MHz |
| Standby Mode Current | 0.29 uA |
| Architecture | ARMv8-M with TrustZone security extension |
| Process Technology | 40 nm |
| Package | 144-LQFP (20x20 mm) |
| Mounting Type | Surface Mount |
| Peripherals | USART/UART, SPI, I2C, CAN-FD, USB FS, SAI, 12-bit ADC, 12-bit DAC, RTC |
| Series | STM32L5 |
| RoHS Status | Compliant |
STM32L552ZET6 144-lqfp (20x20 mm) Pin Configuration Guide
Pin configuration for STM32L552ZET6 (144-lqfp (20x20 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for STM32L552ZET6.
Refer to the datasheet for full pin configuration.
Typical Applications
STM32L552ZET6 is suitable for 6 applications: IoT Edge Nodes, Industrial Sensor Transmitters, Wearable Health Monitors, Smart Meters, Smart Home Devices, Medical Diagnostic Portables.
IoT Edge Nodes
The STM32L552ZET6 fits IoT edge nodes because its Armv8-M TrustZone enforces hardware isolation between secure firmware and application code, a prerequisite for TLS-based device identity and secure OTA updates. The 110 MHz Cortex-M33 with FPU handles protocol stacks (BLE, LoRaWAN, Wi-Fi companion links) with headroom, while 512 KB flash stores the stack plus user application. Run-mode consumption of 33 uA/MHz and 0.29 uA Standby support multi-year battery life when duty cycling sensors. Placed as the system host with an external radio module over SPI or UART, the MCU sleeps in Standby between events and wakes in microseconds via EXTI lines, keeping average current in the low-uA range.
Recommended
Industrial Sensor Transmitters
In 4-20 mA and IO-Link industrial transmitters, the STM32L552ZET6 combines a 12-bit ADC for analog measurement, precision timing from the MSI or external crystal, and low enough sleep current to survive loop-powered budgets. The 1.71 V to 3.6 V supply range tolerates wide industrial regulator output, and CAN-FD interfaces integrate into factory networks. The Cortex-M33 DSP instructions execute digital filtering (IIR/FIR) on sensor signals efficiently, while 256 KB SRAM buffers waveform captures. TrustZone also allows vendors to lock calibration coefficients and firmware identity in a secure domain, protecting OEM intellectual property on fielded instruments.
Recommended
Wearable Health Monitors
Wearable health monitors benefit from the STM32L552ZET6's 0.29 uA Standby current and 33 uA/MHz active efficiency, which directly extend coin-cell or LiPo runtime between charges. The Cortex-M33 FPU computes real-time heart-rate and motion algorithms (sensor fusion) locally, and the SAI audio interface can pair with digital bio-potential AFEs. The 12-bit ADC samples analog sensor channels while low-power timers keep periodic sampling alive in low-power run modes. With TrustZone, patient data can be encrypted before leaving the device, supporting HIPAA-style privacy requirements. The 144-GPIO budget drives displays, haptics, and multiple sensor buses simultaneously without external expanders.
Recommended
Smart Meters
Smart electricity and water meters require decades of service, secure metering data, and compliance with utility cybersecurity mandates - all strengths of the STM32L552ZET6. Its TrustZone architecture supports secure boot chains and encrypted firmware updates required by modern DLMS/COSEM deployments, while 512 KB flash holds metering firmware plus logging tables. The 12-bit ADC and DMA handle current/voltage sampling for energy calculations, and RTC with VBAT backup preserves time-of-use records through outages. Standby current of 0.29 uA matters in battery-backed water/gas meters where the MCU wakes briefly to log flow pulses and transmit over RF or PLC companion chips.
Recommended
Smart Home Devices
Smart locks, thermostats, and security sensors leverage the STM32L552ZET6's balance of security and battery life. TrustZone isolates key storage and cryptographic routines from user applications, hardening devices against the physical and remote attacks common in consumer IoT. The 110 MHz core drives touch interfaces (via the TSC peripheral family), e-ink or segment LCDs, and simultaneously manages Zigbee or BLE coordinator stacks with 256 KB of SRAM providing ample heap. USB FS connectivity simplifies factory programming and charging integration. Its ultra-low-power modes keep battery-powered sensors running for years between CR123 or AA cell replacements, reducing warranty and service costs for manufacturers.
Recommended
Medical Diagnostic Portables
Portable medical diagnostics - glucometers, pulse oximeters, handheld ECG - use the STM32L552ZET6 for its combination of analog capability, signal processing throughput, and secure data handling. The 12-bit ADC with DMA captures bio-sensor waveforms while Cortex-M33 DSP instructions run FFT and filtering in real time; the FPU accelerates SpO2 and impedance algorithms. Patient data confidentiality is enforced with TrustZone-isolated cryptography before results sync over USB or a wireless companion. Run efficiency of 33 uA/MHz lets the instrument operate hundreds of hours on rechargeable cells, and the 40 nm process keeps self-heating low, protecting measurement stability in precision front ends.
Recommended
Recommended Products Summary
Engineering reference data for STM32L552ZET6 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32L562ZET6 | STM32L552ZCT6 | STM32L476VGT6 |
|---|---|---|---|---|
| Package | 144-LQFP (20x20 mm) | 144-LQFP - same | 144-LQFP - same | 100-LQFP - different |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Core | Cortex-M33 + TrustZone + FPU, 110 MHz | Cortex-M33 + TrustZone + FPU, 110 MHz | Cortex-M33 + TrustZone + FPU, 110 MHz | Cortex-M4 + FPU, 80 MHz |
| Flash Memory | 512 KB | 512 KB | 256 KB | 1024 KB |
| SRAM | 256 KB | 256 KB | 256 KB | 128 KB |
| Hardware AES | No | Yes (AES coprocessor) | No | No |
| Supply Voltage | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V |
| Lifecycle Status | Active | Active | Active | Active |
Key Differentiators
- TrustZone security on Armv8-M (vs STM32L476VGT6)
- Lower active energy per MHz (vs STM32L476VGT6)
- Drop-in secure upgrade path (vs STM32L562ZET6)
Design Notes
Decouple every VDD/VSS pair with a 100 nF ceramic capacitor placed within 2 mm of the pins, and add 4.7 uF bulk capacitance near the regulator output. If the L5 family SMPS is enabled, follow the ST datasheet inductor selection guidance (recommended inductance and current rating per the SMPS design section) and keep the switching loop compact to limit radiated EMI. Connect VBAT to VDD when the RTC backup domain is unused. Estimated: at 3.3 V and 20 mA average load, dissipation is only ~66 mW, so no thermal design effort is normally required.
The 144-pin LQFP at 0.5 mm pitch requires careful solder-mask-defined pad geometry per ST's layout recommendations. Route the SWD debug pair (SWCLK/SWDIO) with series resistors accessible on a test header for production programming. Keep the 8 MHz HSE crystal traces short, symmetric, and guarded by ground; add BOOT0 pull-down to guarantee deterministic boot from flash. Reserve VDDUSB decoupling even if USB is unused, since the pin still requires biasing per the datasheet.
TrustZone changes the programming model: with security enabled, peripheral access from non-secure code requires SAU/IDAU configuration, and misconfigured secure attribution is a frequent bring-up failure - start with STM32CubeMX-generated templates. Flash erase granularity and option-byte behavior differ from the older STM32L4; do not reuse L4 flash-driver code unmodified. Also note Standby mode clears SRAM contents by default - use the dedicated Standby SRAM or Shutdown-mode strategy if data retention across wake-up is required.
Compliance Information
RoHS compliant per distributor listings for the STM32L552ZET6 (suffix T6 indicates lead-free, RoHS-compliant tray packaging). REACH and halogen-free status not stated in provided data.