STMicroelectronics STM32H7A3LIH6Q

Overview

STM32H7A3LIH6Q from STMicroelectronics is a 32-bit Arm® Cortex®-M7 microcontroller operating at up to 280 MHz with double-precision FPU, 16 KB instruction and 16 KB data cache, 1 MB flash (dual-bank), and ~1.4 MB RAM including 64 KB ITCM + 128 KB DTCM. It integrates dual Octo-SPI interfaces, FMC, two ADCs (up to 24 channels, 3.6 MSPS), dual DACs, two op-amps, and SMPS support - deployed in industrial PLCs and motor control systems.

For engineers reviewing the STM32H7A3LIH6Q datasheet, STM32H7A3LIH6Q pinout, STM32H7A3LIH6Q application, or STM32H7A3LIH6Q equivalent, key selection criteria include verified 280 MHz real-time performance, deterministic TCM memory mapping for time-critical routines, dual-bank flash for seamless firmware updates, SMPS integration for high-efficiency power conversion, and validated 168 GPIO count with 164 5-V-tolerant pins.

Technical Context

The STM32H7A3LIH6Q implements a six-stage dual-issue Cortex-M7 core with dynamic branch prediction and Harvard architecture, enabling deterministic execution of DSP-intensive algorithms. Its L1 cache hierarchy (16 KB I-cache + 16 KB D-cache) is fed directly from 128-bit embedded flash, achieving single-cycle cache-line fill for sustained 280 MHz operation.

Memory subsystem includes three independent domains: CPU domain (CD) with 64 KB ITCM/128 KB DTCM for latency-critical code/data, Smart Run Domain (SRD) hosting RTC, backup SRAM, and low-power peripherals, and AXI/AHB interconnect supporting concurrent access to 1 MB flash, 1.18 MB user SRAM, and external memories via FMC or dual Octo-SPI.

Key Specifications

Pinout & Package

STM32H7A3LIH6Q is housed in a UFBGA176+25 package (10 × 10 mm, 0.65 mm pitch), featuring 176 signal balls plus 25 dedicated VSS/VDD balls for robust power integrity and EMI suppression. The package supports 168 GPIOs (164 5-V-tolerant), with dedicated pins for SMPS feedback (VFBSMPS), core voltage regulation (VCAP, VDDLDO), and separate SDMMC supply (VDDMMC).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-performance Cortex-M7 microcontroller applications.

Compared with STM32H7B3LIH6Q, the STM32H7A3LIH6Q trades flash capacity and crypto features for lower unit cost and identical SMPS integration; versus STM32H743VIH6, it delivers superior power efficiency and memory expansion via dual Octo-SPI at the expense of pin count and package thermal profile.

Availability

STM32H7A3LIH6Q is available at Aetrix Electronics and suitable for industrial PLCs, motor drive inverters, medical imaging subsystems, and smart energy gateways requiring stable component supply across extended product lifecycles.

Supply support for STM32H7A3LIH6Q 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 analog devices for industrial, automotive, and consumer markets.

The STM32H7 series targets high-end embedded applications demanding real-time determinism, rich peripheral integration, and energy efficiency - specifically engineered for industrial automation, motor control, and advanced human-machine interfaces.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32H7A3LIH6Q achieves 280 MHz through its Arm Cortex-M7 core with six-stage dual-issue pipeline and dynamic branch prediction. This frequency is sustained by feeding the core from 128-bit wide embedded flash with 16 KB instruction and 16 KB data caches, enabling single-cycle cache-line fills. Voltage scaling (VOS0) and proper PCB layout for VCAP decoupling are required to maintain stability at this speed.

Does STM32H7A3LIH6Q support hardware encryption and secure boot?

Yes, it includes a true random number generator (TRNG) compliant with NIST SP 800-90B, hardware AES-128/256 engines, and secure firmware upgrade support with ROP and PC-ROP protection. However, unlike the H7B3 variant, it lacks the Public Key Accelerator (PKA) for RSA/ECC operations. Secure boot relies on embedded ROM bootloader with hash-based signature verification.

How does the SMPS interface function and what external components are required?

The integrated SMPS controller requires external components: a power inductor, MOSFETs (high-side and low-side), feedback resistors, and output capacitors. VFBSMPS pin monitors output voltage via resistor divider; VCAP stabilizes internal LDO. The SMPS can directly supply VCORE or an external circuit, reducing system-level power loss by up to 30% compared to LDO-only solutions.

Can both Octo-SPI interfaces operate simultaneously, and what memory types do they support?

Yes, both Octo-SPI interfaces operate concurrently in muxed mode. They support serial PSRAM, NOR flash, HyperRAM, and Hyperflash in SDR and DTR modes - up to 140 MHz in SDR and 110 MHz in DTR. Each interface uses dedicated DQS lines for timing margin improvement, and both support XIP (execute-in-place) and memory-mapped reads, enabling boot-from-Octo-SPI and dual-memory architectures.