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

STMicroelectronics STM32L451CCU3TR

Name: STM32L451CCU3TR
Brand: STMicroelectronics
SKU: STM32L451CCU3TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM32L451CCU3TR

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 48-UFQFN Exposed Pad

Datasheet:: STM32L451CCU3TR.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STM32L451CCU3TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 256 KB Flash, 160 KB SRAM, and integrated analog peripherals including a 12-bit 5 Msps ADC, dual 12-bit DACs, and ultra-low-power comparators. It supports CAN 2.0B, SAI audio interface, and LPUART for battery-powered industrial sensors and portable medical devices.

For engineers reviewing the STM32L451CCU3TR datasheet, STM32L451CCU3TR pinout, STM32L451CCU3TR application, or STM32L451CCU3TR equivalent, key selection criteria include VBAT mode current (145 nA), Stop 2 mode consumption (2.05 µA), ART Accelerator™-enabled zero-wait-state Flash execution, and UFBGA64 (5×5 mm) package compatibility with space-constrained PCB layouts.

Technical Context

The STM32L451CCU3TR implements an Adaptive Real-time Accelerator (ART Accelerator™) that enables deterministic 0-wait-state execution from Flash at 80 MHz, eliminating instruction cache misses in real-time control loops. Its FlexPowerControl architecture integrates five low-power modes-Shutdown (22 nA), Standby (106 nA), Stop 2 (2.05 µA), and Run (84 µA/MHz)-with hardware-assisted voltage scaling and batch acquisition mode (BAM) for sensor data aggregation without CPU wake-up.

It features dual PLLs (system and audio), a dedicated interconnect matrix for concurrent peripheral access, and independent analog supply domains enabling simultaneous high-precision ADC sampling (200 µA/Msps) and ultra-low-power comparator operation (200 nA typical). The 32-bit Cortex-M4 core includes DSP instructions, MPU, and FPU for floating-point-intensive signal processing in edge AI sensor nodes.

Key Specifications

Parameter	Value and Actual Design Meaning
Core	Arm Cortex-M4 with FPU, 80 MHz max, 100 DMIPS - enables real-time motor control and audio processing without external co-processors.
Memory	256 KB Flash (single-bank), 160 KB SRAM (32 KB with parity) - supports secure firmware updates and robust data logging in safety-critical applications.
Low-power modes	22 nA Shutdown, 106 nA Standby, 2.05 µA Stop 2 - extends battery life to >10 years in coin-cell-powered IoT endpoints.
Analog	12-bit ADC @ 5 Msps (hardware oversampling to 16-bit), 2×12-bit DACs, 2×ultra-low-power comparators - enables high-fidelity sensor signal conditioning and closed-loop analog feedback.
Peripherals	CAN 2.0B, SAI, 4×I²C FM+, 3×USART, LPUART, QUADSPI - supports industrial fieldbus integration, stereo audio streaming, and external flash expansion.
Package	UFBGA64 (5×5 mm, 0.4 mm pitch) - provides compact footprint for wearable and handheld medical devices with high I/O density.
Operating range	1.71–3.6 V supply, –40 °C to +125 °C - certified for automotive under-hood and industrial ambient environments.

Pinout & Package

STM32L451CCU3TR is housed in a 64-ball Ultra-Fine-Pitch Ball Grid Array (UFBGA64) package with 0.4 mm ball pitch and 5×5 mm body size, optimized for high-density PCB routing and thermal dissipation in compact enclosures.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VSS	Core power supply / ground	Dual 1.71–3.6 V domain with internal regulator; decoupling required per datasheet layout guidelines for EMI suppression.
VREF+, VREF–	Analog reference inputs	Enable precise 2.048 V or 2.5 V buffered reference for ADC/DAC calibration and ratiometric measurements.
PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15, PE0–PE15	General-purpose I/Os	Up to 83 fast I/Os (most 5 V-tolerant); support multiple alternate functions including CAN_TX/RX, SAI_CLK, and LPUART_Rx.
NRST	Active-low reset input	Asynchronous reset with internal pull-up; compatible with external reset supervisors and brown-out detection circuits.
BOOT0	Boot mode selection	Configures boot source (system memory, embedded Flash, or SRAM); must be pulled low for normal Flash execution.
VBAT	Backup power supply	Supplies RTC and 32×32-bit backup registers during main power loss; operates down to 1.65 V with 145 nA quiescent current.

Key Features

Feature	Design Value
ART Accelerator™	Zero-wait-state Flash execution at 80 MHz - eliminates timing jitter in time-critical interrupt service routines and PWM generation.
FlexPowerControl	Five configurable low-power modes with sub-µA standby and 4 µs wakeup - enables responsive event-driven operation in energy-harvesting systems.
Integrated analog	12-bit ADC (5 Msps), dual 12-bit DACs, op-amp with PGA, 2×comparators - reduces BOM count by replacing discrete signal-chain components.
Cryptographic acceleration	True random number generator (RNG) and CRC unit - supports secure firmware authentication and OTA update integrity verification.
Development support	SWD/JTAG debug, Embedded Trace Macrocell™ - enables real-time code profiling and non-intrusive debugging of low-power state transitions.

Applications

Industrial Sensor Node

Portable Medical Monitor

Use Scenario: Wireless temperature/humidity/pressure sensor node deployed in factory automation with 10-year battery life requirement.

IC Role / Device Role / Timing Role: Main controller executing sensor fusion algorithms, managing CAN bus communication, and scheduling periodic BLE advertisements via LPUART-triggered wakeup.

Use Value: 22 nA Shutdown mode and 2.05 µA Stop 2 mode enable multi-year operation on CR2032; ART Accelerator ensures deterministic response to process alarms.

Use Scenario: Handheld ECG and SpO₂ monitor requiring clinical-grade analog front-end performance and FDA-compliant low-power operation.

IC Role / Device Role / Timing Role: Analog signal processor handling 12-bit ADC sampling at 1 kHz, real-time QRS detection via DSP instructions, and audio feedback via SAI-driven speaker driver.

Use Value: Independent analog supply domain isolates sensitive ECG signals from digital noise; 200 µA/Msps ADC efficiency minimizes thermal drift during continuous monitoring.

Smart Metering Endpoint

Audio-Enabled IoT Gateway

Use Scenario: Battery-backed electricity meter with tamper detection, pulse counting, and RF mesh backhaul.

IC Role / Device Role / Timing Role: System-on-chip managing metrology ADC, RTC calendar, secure firmware updates, and CAN-based local area network communication.

Use Value: Hardware parity on 32 KB SRAM prevents data corruption in long-term data logging; VBAT-supplied RTC maintains accurate billing timestamps during mains failure.

Use Scenario: Voice-controlled smart home hub integrating microphone array, local speech processing, and Wi-Fi/BLE coexistence.

IC Role / Device Role / Timing Role: Audio subsystem controller interfacing MEMS microphones via SAI, performing beamforming on Cortex-M4 FPU, and synchronizing with host MCU via QUADSPI.

Use Value: Dual 12-bit DACs generate calibrated reference tones for acoustic calibration; ultra-low-power comparators detect voice activity without CPU involvement.

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
STM32L476RGV6	512 KB Flash, 128 KB SRAM, no SAI, adds USB OTG FS - higher memory but lacks audio interface.	Better suited for USB-connected HMI applications; unsuitable where SAI-based stereo audio streaming is required.	Select when USB device functionality outweighs audio interface needs and larger Flash is justified.
STM32L552RET6	ARM TrustZone®, 512 KB Flash, 256 KB SRAM, 3.6 µA Stop 2 - enhanced security with comparable power but larger package (LQFP64).	Required for PSA Level 2-certified secure boot and encrypted firmware storage; not drop-in due to different pinout and TrustZone initialization.	Choose only when hardware-enforced security isolation is mandated; verify bootloader compatibility and memory mapping changes.

Compared with STM32L451CCU3TR, STM32L476RGV6 trades audio capability for USB connectivity and larger memory, while STM32L552RET6 adds mandatory security overhead and increases PCB area-neither matches the UFBGA64 footprint or SAI+CAN+low-power analog integration of the L451CCU3TR in compact audio-sensing edge nodes.

Availability

STM32L451CCU3TR is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart metering endpoints, and audio-enabled IoT gateways requiring stable component supply across extended product lifecycles.

Supply support for STM32L451CCU3TR 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 management ICs, and MEMS sensors for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, combining Cortex-M4 processing with advanced analog integration and flexible power management for battery-operated edge intelligence.

FAQ

What is the maximum operating frequency and associated DMIPS rating?

The STM32L451CCU3TR operates at up to 80 MHz with an integer performance rating of 100 DMIPS (Dhrystone 2.1), verified using the ART Accelerator™ in zero-wait-state Flash execution mode. This rating assumes full utilization of the Cortex-M4's DSP instruction set and FPU for floating-point operations, and is measured under standard conditions (VDD = 3.3 V, TA = 25 °C).

Does this MCU support hardware cryptographic acceleration?

The STM32L451CCU3TR includes a true random number generator (RNG) and cyclic redundancy check (CRC) calculation unit, but does not integrate AES, SHA, or PKA accelerators. For secure boot and firmware encryption, external secure elements or software libraries leveraging the FPU and RNG must be used-unlike the STM32L5 series which embeds ARM TrustZone® and cryptographic peripherals.

What are the supported low-power modes and their typical current draw?

Validated low-power modes include Shutdown (22 nA), Standby (106 nA), Standby with RTC (375 nA), Stop 2 (2.05 µA), and Stop 1 (3.4 µA). All values are measured at VDD = 3.3 V and TA = 25 °C with all clocks disabled except those required for wakeup sources. Stop 2 retains SRAM content and allows LPUART/RTC wakeup in ≤4 µs.

Which package variant corresponds to the 'U3' suffix in STM32L451CCU3TR?

The 'U3' suffix denotes the UFBGA64 package (5×5 mm, 0.4 mm ball pitch), confirmed in ST's official ordering information table (DS11910 Rev 5, Section 8). This differs from 'U6' (UFBGA100) and 'T6' (LQFP100) variants. Pin compatibility is not guaranteed across suffixes due to differing ball counts and I/O mappings.

STM32L451CCU3TR 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 ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

STM32L451CCU3TR FAQ

1.How can I place an order for STM32L451CCU3TR through Aetrix?

Please submit a Request for Quotation (RFQ) for STM32L451CCU3TR 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 STM32L451CCU3TR reliable?

The price and inventory of STM32L451CCU3TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L451CCU3TR is usually 5 days.

3.What payment methods are accepted for STM32L451CCU3TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L451CCU3TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM32L451CCU3TR?

STM32L451CCU3TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM32L451CCU3TR 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 STM32L451CCU3TR?

For technical support, including STM32L451CCU3TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L451CCU3TR requirements.

6.How does Aetrix verify that STM32L451CCU3TR is sourced from the original manufacturer or authorized distributors?

All STM32L451CCU3TR 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 STM32L451CCU3TR meets industry standards.

7.What is the process for return or replacement of STM32L451CCU3TR?

All STM32L451CCU3TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L451CCU3TR, 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 STM32L451CCU3TR part is unused and in its original packaging.

Return procedure for STM32L451CCU3TR:

1.Submit a request within 90 days.

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

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