STMicroelectronics STM32L451VET6

Overview

STM32L451VET6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 512 KB Flash, 160 KB SRAM, and integrated analog peripherals including a 12-bit 5 Msps ADC, dual 12-bit DACs, and hardware-accelerated capacitive touch sensing. It targets battery-powered IoT edge nodes requiring long runtime, secure firmware execution, and audio-capable human interface.

For engineers reviewing the STM32L451VET6 datasheet, STM32L451VET6 pinout, STM32L451VET6 application, or STM32L451VET6 equivalent, key selection criteria include its 22 nA shutdown current, 4 µs wake-up from Stop mode, LPUART + SAI audio support, and UFBGA100 package compatibility with high I/O density and 5 V-tolerant pins.

Technical Context

The STM32L451VET6 implements an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from Flash at 80 MHz, paired with a memory protection unit (MPU) and proprietary code readout protection. Its FlexPowerControl architecture supports seven low-power modes - including Shutdown (22 nA), Standby with RTC (375 nA), and Stop 2 (2.05 µA) - managed via dedicated power control registers and interconnect matrix arbitration.

It integrates dual PLLs (system and audio), clock recovery system (CRS), and independent analog supply domains for ADC/DAC/OPAMP/COMP. The 83 fast I/Os include 5 V-tolerant capability on most pins, and the device supports batch acquisition mode (BAM) for efficient peripheral data capture during low-power operation.

Key Specifications

Pinout & Package

STM32L451VET6 is packaged in a 100-pin UFBGA (7×7 mm, 0.5 mm pitch), RoHS-compliant and ECOPACK2® certified. This package supports high I/O count (up to 83 fast I/Os), thermal efficiency for extended industrial operation, and compact PCB layout for space-constrained wearables and sensor hubs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L476VGT6, the STM32L451VET6 offers lower active power and integrated SAI for audio, while the STM32L552VET6 adds mandatory security features at the expense of higher static current and design complexity.

Availability

STM32L451VET6 is available at Aetrix Electronics and suitable for smart wearables, industrial wireless sensors, secure asset trackers, and audio-enabled smart home controllers requiring stable component supply across multi-year production cycles.

Supply support for STM32L451VET6 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, sensors, and automotive semiconductors since 1987.

The STM32L4 series is engineered for ultra-low-power embedded applications demanding extended battery life, rich analog integration, and real-time performance - targeting IoT endpoints, portable medical devices, and energy-efficient industrial controls.

FAQ

What is the maximum operating frequency and core type of the STM32L451VET6?

The STM32L451VET6 features an Arm Cortex-M4 core with FPU, rated for up to 80 MHz operation delivering 100 DMIPS. It uses the ART Accelerator™ to achieve zero-wait-state execution from Flash memory, ensuring deterministic real-time response without cache-related jitter.

Does the STM32L451VET6 support USB functionality, and what are its power implications?

Yes, it integrates a full-speed USB 2.0 interface (PA11/PA12) with internal transceiver and crystal-less operation via the 48 MHz HSI48 oscillator. In USB-active mode, typical current is ~10 mA; however, the device can enter Stop mode with USB clock gated, reducing consumption to 2.05 µA while retaining USB resume capability.

How many low-power modes does the STM32L451VET6 support, and what is the lowest achievable current?

It supports seven low-power modes: Shutdown (22 nA), Standby (106 nA), Standby+RTC (375 nA), Stop 2 (2.05 µA), Stop 1 (4.2 µA), Sleep (84 µA/MHz), and Run (84 µA/MHz). Shutdown mode disables all clocks and regulators except VBAT domain, making it ideal for long-term storage or battery backup scenarios.

Can the STM32L451VET6 drive a capacitive touch interface without external components?

Yes, it includes a dedicated Touch Sensing Controller (TSC) supporting up to 21 channels with built-in charge transfer measurement, spread spectrum modulation, and hardware-accelerated scan sequencing. It drives touchkeys, linear sliders, and rotary wheels directly using standard PCB traces - no external RC networks or dedicated touch ICs required.