STMicroelectronics STM32L451VCT6

Overview

STM32L451VCT6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz and delivering 100 DMIPS. It integrates 512 KB Flash, 160 KB SRAM (32 KB with hardware parity), and rich analog peripherals including a 12-bit 5 Msps ADC, dual 12-bit DACs, op-amp with PGA, and RTC with HW calendar-targeting battery-powered IoT sensor nodes and portable medical devices.

For engineers reviewing the STM32L451VCT6 datasheet, STM32L451VCT6 pinout, STM32L451VCT6 application, or STM32L451VCT6 equivalent, key selection criteria include ultra-low-power Stop 2 mode (2.05 µA), 83 fast I/Os (most 5 V-tolerant), SAI audio interface, CAN 2.0B support, and LQFP100 package compatibility for industrial-grade embedded control.

Technical Context

The STM32L451VCT6 implements an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from Flash at 80 MHz, paired with a Memory Protection Unit (MPU) and interconnect matrix for deterministic peripheral arbitration. Its power architecture supports seven low-power modes-including Shutdown (22 nA), Standby with RTC (375 nA), and Stop 2 (2.05 µA)-with sub-4 µs wakeup latency and Brown-out Reset (BOR) supervision.

It features dual PLLs (system/audio), clock recovery (CRS), and flexible clock sources: 4–48 MHz HSE, 32 kHz LSE, factory-trimmed 16 MHz HSI16 (±1%), and auto-calibrated MSI (100 kHz–48 MHz, ±0.25%). Analog subsystem includes independent supply domains, 2x ultra-low-power comparators, and buffered 2.048 V/2.5 V reference voltage output.

Key Specifications

Pinout & Package

LQFP100 (14×14 mm, 0.5 mm pitch) package with exposed thermal pad; 100-pin layout supporting full peripheral mapping, 83 general-purpose I/Os (most 5 V-tolerant), and dedicated VDDA/VSSA analog supply pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L476VGT6, the STM32L451VCT6 offers lower static power and integrated SAI for audio, while STM32L552VET6 adds TrustZone but requires PCB redesign-making STM32L451VCT6 optimal for cost-sensitive, battery-constrained audio/IoT endpoints where moderate security suffices.

Availability

STM32L451VCT6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable medical diagnostic tools requiring stable component supply across multi-year production cycles.

Supply support for STM32L451VCT6 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 semiconductors since 1987.

The STM32L4 series targets ultra-low-power embedded applications-balancing energy efficiency, rich analog integration, and ARM Cortex-M4 performance for battery-operated IoT and portable equipment.

FAQ

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

The STM32L451VCT6 operates up to 80 MHz with the ART Accelerator enabled. At this frequency, typical Run mode current is 84 µA/MHz (6.72 mA total), measured with code executing from Flash, peripherals disabled, and VDD = 3.3 V. Actual consumption varies with active peripherals, voltage scaling, and memory access patterns.

Does STM32L451VCT6 support hardware encryption acceleration?

No, the STM32L451VCT6 does not include dedicated cryptographic accelerators (e.g., AES, PKA, HASH). It relies on software libraries for encryption. For hardware-accelerated crypto, consider the STM32L552xx or STM32U5xx families, which integrate AES-256, PKA, and secure key storage.

Can the internal 32 kHz RC oscillator be used for RTC calibration instead of an external crystal?

Yes-the internal LSI (32 kHz RC, ±5%) can drive the RTC in low-power modes, but it lacks the stability (<±10 ppm) required for precise timekeeping over temperature and voltage. For calendar-accurate RTC operation, ST recommends the external 32.768 kHz crystal on PC14/PC15 with hardware calibration support.

Is the LQFP100 package RoHS and REACH compliant?

Yes, the STM32L451VCT6 in LQFP100 packaging meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. All packages are ECOPACK2® certified, confirming lead-free terminations, halogen-free molding compounds, and full substance declaration compliance.