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

STMicroelectronics STM32L451CCU6TR

Name: STM32L451CCU6TR
Brand: STMicroelectronics
SKU: STM32L451CCU6TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM32L451CCU6TR

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 48-UFQFN Exposed Pad

Datasheet:: STM32L451CCU6TR.pdf

Description:: IC MCU 32BIT 256KB FLSH 48UFQFPN

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Product details

Overview

STM32L451CCU6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, delivering 100 DMIPS at 80 MHz, featuring 256 KB Flash, 64 KB SRAM, and integrated analog peripherals including a 12-bit 5 Msps ADC, dual 12-bit DACs, and hardware-accelerated capacitive touch sensing - deployed in battery-powered IoT sensor nodes requiring sub-µA standby operation and real-time audio preprocessing.

For engineers reviewing the STM32L451CCU6TR datasheet, STM32L451CCU6TR pinout, STM32L451CCU6TR application, or STM32L451CCU6TR equivalent, key selection criteria include verified 106 nA Standby current with RTC retention, LPUART wake-up capability in Stop 2 mode, UFBGA64 (5×5 mm) package pin compatibility, and support for SAI-based mono audio streaming in resource-constrained edge devices.

Technical Context

The device implements an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from Flash memory, paired with a dual-voltage regulator architecture supporting dynamic voltage scaling across Run, Stop, and Standby modes. Its interconnect matrix decouples bus arbitration between CPU, DMA, and peripherals to sustain deterministic latency under mixed workloads.

Core clocking integrates two PLLs - one for system/USB/SAI clocks and another for ADC/audio synchronization - with auto-trimmed MSI oscillator accuracy better than ±0.25% via LSE reference, and hardware CRC unit + 96-bit unique ID for secure firmware validation and traceability.

Key Specifications

Parameter	Value and Actual Design Meaning
CPU Core	Arm Cortex-M4 with FPU, 80 MHz max frequency, 100 DMIPS performance - enables real-time DSP filtering and sensor fusion without external co-processor.
Memory	256 KB Flash (single-bank), 64 KB SRAM (32 KB with parity) - sufficient for BLE stack + application logic + OTA update staging in compact firmware images.
Low-Power Modes	106 nA Standby (5 wakeup pins), 375 nA Standby+RTC, 2.40 µA Stop 2+RTC - extends coin-cell battery life beyond 10 years in periodic-sensing applications.
Analog Peripherals	12-bit ADC @ 5 Msps (200 µA/Msps), 2× 12-bit DACs, 2× ultra-low-power comparators - supports simultaneous analog signal acquisition and feedback control in portable medical monitors.
Communication	1× SAI, 4× I²C (FM+), 3× USART, 1× LPUART, 1× CAN 2.0B, SDMMC - enables concurrent BLE HCI transport, local sensor bus, and SD card logging without external level shifters.
Package	UFBGA64 (5×5 mm, 0.5 mm pitch) - provides high I/O density (up to 51 GPIOs) in space-constrained wearable PCB layouts with thermal pad for passive dissipation.
Security & Debug	Hardware RNG, CRC unit, 96-bit unique ID, SWD/JTAG debug - meets IEC 62443-3-3 SL1 requirements for firmware integrity and field diagnostics.

Pinout & Package

STM32L451CCU6TR is housed in a 64-ball Ultra Fine Pitch Ball Grid Array (UFBGA64) package with 0.5 mm ball pitch and exposed thermal pad. Pin assignments follow ST's standard STM32L4x1 pinout layout for UFBGA64, supporting full peripheral remapping via alternate function registers.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VSS	Power supply and ground	Dual-domain power pins: VDD supplies digital core and I/Os (1.71–3.6 V); separate VDDA/VSSA required for analog subsystem stability.
PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15, PE0–PE1	General-purpose I/O	Up to 51 GPIOs, most 5 V-tolerant; support 16-channel capacitive touch sensing (TSC) on dedicated pins (e.g., PA0–PA7, PC0–PC7).
PA2/PA3, PB10/PB11, PC10/PC11	USART/LPUART TX/RX	LPUART on PA2/PA3 enables <4 µs wake-up from Stop 2 mode - critical for low-latency sensor event response.
PA1, PA4–PA7, PB0–PB1, PC0–PC5	ADC/DAC/OPAMP inputs/outputs	Supports single-ended/differential ADC sampling, DAC buffered outputs, and PGA gain configuration for direct sensor interface without external op-amps.
PC6–PC9, PD8–PD12	SAI1 data/clock lines	Configurable for mono I²S or PCM audio streaming to external codec or MEMS microphone with frame sync precision.
PF0–PF1	RTC oscillator input/output	Connects 32.768 kHz crystal for hardware calendar, alarm, and calibration - retains timekeeping in VBAT mode at 145 nA.

Key Features

Feature	Design Value
FlexPowerControl architecture	Enables 7 low-power modes (Shutdown to Run) with sub-µA retention - reduces average system current by >90% vs. legacy Cortex-M3 MCUs in duty-cycled sensing.
Batch Acquisition Mode (BAM)	Permits autonomous ADC/DAC/OPAMP operation during CPU sleep - captures 100+ sensor samples per wake cycle without CPU intervention.
ART Accelerator™	Eliminates Flash wait states at 80 MHz - achieves 3.42 CoreMark/MHz while maintaining deterministic interrupt latency (<12 cycles).
Hardware touch controller (TSC)	Supports 21-channel capacitive sensing with built-in charge transfer and noise immunity - replaces discrete RC networks in touch-button HMI designs.
SAI + LPUART combo	Allows simultaneous low-power audio capture (via SAI) and asynchronous command receipt (via LPUART) - enables voice-triggered wake-up in always-on edge microphones.

Applications

Wearable Health Monitor

Smart Utility Meter

Use Scenario: Continuous ECG/PPG signal acquisition with motion artifact compensation and BLE telemetry upload every 30 seconds.

IC Role / Device Role / Timing Role: Primary MCU executing sensor fusion algorithm, managing dual ADC channels, driving OLED display via SPI, and handling BLE HCI over UART.

Use Value: 2.40 µA Stop 2+RTC enables 5-year CR2032 battery life; hardware oversampling (16-bit effective) improves SNR without increasing host CPU load.

Use Scenario: Tamper-resistant electricity meter with pulse counting, temperature-compensated RTC, and NB-IoT modem interface.

IC Role / Device Role / Timing Role: System controller coordinating metrology ASIC, secure crypto engine, and modem UART communication with precise 1-second timebase.

Use Value: 375 nA Standby+RTC ensures accurate billing timestamping during grid outages; embedded VREFBUF (2.5 V) stabilizes metrology ADC reference under varying supply conditions.

Industrial Wireless Sensor Node

Portable Audio Recorder

Use Scenario: LoRaWAN node collecting vibration, temperature, and humidity data every 10 minutes using onboard sensors and transmitting via SX1276.

IC Role / Device Role / Timing Role: Host processor interfacing I²C sensors, managing LoRa transceiver SPI, and performing FFT-based anomaly detection before transmission.

Use Value: 106 nA Standby mode minimizes quiescent drain; hardware CRC accelerates packet integrity check, reducing active time by 18% vs. software CRC.

Use Scenario: Pocket-sized recorder capturing mono voice memos via MEMS mic, storing WAV files on microSD, and playing back through Class-D amp.

IC Role / Device Role / Timing Role: Audio subsystem controller handling SAI-driven I²S input, SDMMC file writes, and DAC playback with sample-rate locking to internal PLL.

Use Value: SAI supports 16-bit/16 kHz recording with <10 ppm jitter; 64 KB SRAM buffers 2 seconds of uncompressed audio for glitch-free SD write bursts.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power Cortex-M4 MCU applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STM32L431CCU6	256 KB Flash, 64 KB SRAM, no SAI, no SDMMC, 1× DAC, lower analog integration	Suitable for cost-sensitive sensor nodes without audio or high-speed storage needs	Select when SAI/SDMMC are unused and BOM cost reduction is prioritized over future feature scalability.
STM32L476RGV6	1 MB Flash, 128 KB SRAM, SAI, SDMMC, USB OTG FS, higher pin count (LQFP64)	Targets USB-connected diagnostic tools or multi-interface gateways requiring larger code footprint	Choose when USB host/device capability or >512 KB Flash is required - not drop-in compatible due to different package and peripheral mapping.

Compared with STM32L431CCU6, the STM32L451CCU6TR adds SAI and SDMMC for audio/data logging while retaining identical power profiles; versus STM32L476RGV6, it trades Flash/SRAM capacity and USB for smaller UFBGA64 footprint and lower static current in deep-sleep modes.

Availability

STM32L451CCU6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable audio recorders requiring stable component supply across multi-year production cycles.

Supply support for STM32L451CCU6TR 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-grade components since 1987.

The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, rich analog integration, and real-time responsiveness - optimized for IoT endpoints, portable medical devices, and energy-harvesting systems.

FAQ

What is the maximum operating frequency and associated power consumption in Run mode?

The STM32L451CCU6TR operates up to 80 MHz with ART Accelerator enabled. At this frequency and 3.3 V supply, typical Run mode current is 84 µA/MHz (≈6.72 mA total), measured with code executing from Flash and prefetch disabled. This value assumes all peripherals inactive except core and SysTick timer.

Does STM32L451CCU6TR support hardware encryption or secure boot features?

No, the STM32L451CCU6TR does not integrate AES, PKA, or secure boot engines. It provides basic security primitives - true random number generator (RNG), CRC calculation unit, and 96-bit unique ID - but lacks dedicated cryptographic accelerators or tamper-detection circuitry found in STM32L4+ or STM32H5 series.

Can the internal 32 kHz RC oscillator replace the external LSE crystal for RTC operation?

Yes, the internal LSI (32 kHz RC) can drive the RTC, but with ±5% accuracy versus ±20 ppm for LSE. For applications requiring precise timekeeping (e.g., utility meter billing), LSE is mandatory; LSI is acceptable only for non-critical timestamps where ±15-minute drift per day is tolerable.

What development tools are officially supported for STM32L451CCU6TR firmware development?

ST provides full support via STM32CubeIDE (free Eclipse-based IDE), STM32CubeMX (graphical initialization tool), and HAL/LL drivers. Hardware debugging uses ST-LINK/V2-1 or J-Link probes over SWD interface; no JTAG support required as SWD suffices for all debug and programming functions.

STM32L451CCU6TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 48-UFQFN Exposed Pad

Series:: STM32L4

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Core Processor:: ARM® Cortex®-M4

Core Size:: 32-Bit Single-Core

Speed:: 80MHz

Connectivity:: CANbus, I2C, IrDA, LINbus, QSPI, SAI, SPI, UART/USART

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

Number of I/O:: 38

Program Memory Size:: 256KB (256K x 8)

Program Memory Type:: FLASH

EEPROM Size:: -

RAM Size:: 160K x 8

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

Data Converters:: A/D 10x12b; D/A 1x12b

Oscillator Type:: Internal

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

STM32L451CCU6TR FAQ

1.How can I place an order for STM32L451CCU6TR through Aetrix?

Please submit a Request for Quotation (RFQ) for STM32L451CCU6TR 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 STM32L451CCU6TR reliable?

The price and inventory of STM32L451CCU6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L451CCU6TR is usually 5 days.

3.What payment methods are accepted for STM32L451CCU6TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L451CCU6TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM32L451CCU6TR?

STM32L451CCU6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM32L451CCU6TR 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 STM32L451CCU6TR?

For technical support, including STM32L451CCU6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L451CCU6TR requirements.

6.How does Aetrix verify that STM32L451CCU6TR is sourced from the original manufacturer or authorized distributors?

All STM32L451CCU6TR 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 STM32L451CCU6TR meets industry standards.

7.What is the process for return or replacement of STM32L451CCU6TR?

All STM32L451CCU6TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L451CCU6TR, 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 STM32L451CCU6TR part is unused and in its original packaging.

Return procedure for STM32L451CCU6TR:

1.Submit a request within 90 days.

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

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