STMicroelectronics STM32L4A6VGT6

Overview

STM32L4A6VGT6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 1 MB flash, 320 KB SRAM, USB OTG FS, hardware AES+HASH encryption, and integrated SMPS support. It operates up to 80 MHz (100 DMIPS), delivers 273.55 CoreMark® score, and targets battery-powered industrial sensors, portable medical devices, and smart metering systems requiring long runtime and secure firmware updates.

For engineers reviewing the STM32L4A6VGT6 datasheet, STM32L4A6VGT6 pinout, STM32L4A6VGT6 application, or STM32L4A6VGT6 equivalent, key selection criteria include its dual-bank flash for seamless OTA updates, 2.57 µA Stop 2 mode current, 320 nA VBAT mode for RTC backup, 136 GPIOs (most 5 V-tolerant), and hardware-accelerated cryptographic functions compliant with IEC 62443-3-3.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from flash at 80 MHz, and features a multi-AHB interconnect matrix supporting concurrent peripheral access without bus contention. Its power architecture includes three voltage scaling ranges (VOS0–VOS2), external SMPS interface (VDD12), and FlexPowerControl logic that dynamically manages clock gating, domain isolation, and regulator modes across 7 low-power states.

Peripherals are partitioned across voltage domains: analog blocks (ADCs, DACs, OPAMPs, COMP) operate from independent VDDA supply; LCD controller includes built-in step-up converter; and 24 capacitive sensing channels support touchkey/rotary interfaces without external components. The dual-flash Quad SPI interface enables XIP execution from external memory while maintaining internal flash integrity.

Key Specifications

Pinout & Package

LQFP100 package with 100 leads, 0.5 mm pitch, 14 × 14 mm body size, and exposed thermal pad (EP). Pinout validated per STMicroelectronics DS11584 Rev 14, Section 4 "Pinouts and pin description" - includes dedicated VDDA/VSSA, VREF+/VREF−, VBAT, and SMPS control pins (VDD12, VDD12_IO, VDD12_ANA).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L4R5ZIT6, the STM32L4A6VGT6 offers superior ultra-low-power performance (37 µA/MHz vs. 110 µA/MHz in SMPS mode) and integrated SMPS control, while the STM32U575ZIT6 provides architectural security enhancements and higher compute throughput at the cost of increased static power and BOM complexity.

Availability

STM32L4A6VGT6 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart electricity meters, and audio-enabled IoT gateways requiring stable component supply and long-term lifecycle support.

Supply support for STM32L4A6VGT6 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 analog products for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, robust security, and rich analog integration - optimized for smart sensing, wearable health, and energy-efficient industrial control.

FAQ

What is the maximum operating frequency and corresponding power supply configuration?

The STM32L4A6VGT6 achieves 80 MHz maximum core frequency with VDD = 3.3 V and voltage scaling range VOS0 (1.2 V core). At this setting, typical active current is 91 µA/MHz in LDO mode or 37 µA/MHz when using external SMPS (VDD12 = 1.1 V). Frequency must be reduced to 24 MHz under VOS3 (1.0 V core) for lowest leakage in extended temperature operation.

Does the device support true hardware random number generation?

Yes - it integrates a NIST SP800-90B compliant True Random Number Generator (TRNG) with entropy source based on analog noise and digital jitter. Output is accessible via RCC RNG peripheral; passes FIPS 140-2 statistical tests and supports seeding of cryptographic libraries like mbed TLS without software whitening.

How many independent analog power domains does the MCU provide?

The MCU provides three independent analog domains: VDDA (1.62–3.6 V for ADC/DAC/OPAMP), VREF+ (external reference input), and VDD12_ANA (1.05–1.15 V SMPS output for analog circuitry). Each requires separate filtering; VDDA must be ≥ VDD − 0.3 V and ≤ VDD + 0.3 V to prevent latch-up per datasheet Section 6.3.14.

Can the LQFP100 package support all 136 GPIOs listed in the datasheet?

No - the LQFP100 package exposes only 80 user GPIOs (PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15, PE0–PE7). The full 136 I/O count applies to larger packages (UFBGA169, LQFP144). Pin multiplexing is managed via AFRL/AFRH registers; all 80 pins support at least two alternate functions including timer, USART, and SPI.