STMicroelectronics STM32H7A3IIT6

Overview

STM32H7A3IIT6 from STMicroelectronics is a 32-bit Arm® Cortex®-M7 microcontroller operating at up to 280 MHz, featuring dual-precision FPU, 16 KB instruction and 16 KB data cache, 2 MB flash, and ~1.4 MB RAM (including 64 KB ITCM + 128 KB DTCM). It integrates two Octo-SPI interfaces, FMC, dual CAN FD, USB OTG HS/FS, LCD-TFT controller, JPEG codec, and SMPS support - deployed in industrial PLCs, motor drives, and medical imaging systems.

For engineers reviewing the STM32H7A3IIT6 datasheet, STM32H7A3IIT6 pinout, STM32H7A3IIT6 application, or STM32H7A3IIT6 equivalent, key selection criteria include verified 280 MHz real-time performance, dual-bank flash with read-while-write, TCM RAM allocation for deterministic ISR latency, Octo-SPI timing compliance (up to 140 MHz SDR), and SMPS integration for sub-3.3 V core supply efficiency.

Technical Context

The Cortex-M7 core implements a six-stage dual-issue pipeline with dynamic branch prediction and Harvard architecture, enabling deterministic execution of DSP-intensive firmware in motor control and audio processing. Its L1 cache hierarchy (16 KB I-cache + 16 KB D-cache) is fed directly from 128-bit embedded flash, eliminating wait states during burst fetches.

Memory subsystem includes three independent bus matrices (AXI + 2 AHB), five DMA controllers (including MDMA for high-bandwidth peripheral-to-memory transfers), and domain isolation between CPU domain (CD) and Smart Run Domain (SRD) - allowing selective clock gating and retention-mode operation of critical peripherals like RTC and backup SRAM.

Key Specifications

Pinout & Package

LQFP176 package (24 × 24 mm, 0.5 mm pitch), 168-pin I/O count (164 5-V-tolerant), ECOPACK2-compliant. Pinout validated per DS13195 Rev 8 (pages 42–62, Table 7).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H7B3IIT6, STM32H7A3IIT6 trades extra SRAM for integrated SMPS - reducing BOM count in battery-powered or low-input-voltage systems. Against STM32H743VIT6, it delivers higher I/O count, Octo-SPI, and JPEG acceleration at the cost of larger LQFP176 footprint and higher pin count complexity.

Availability

STM32H7A3IIT6 is available at Aetrix Electronics and suitable for industrial motor control, medical imaging edge nodes, smart building HMIs, and automated test equipment requiring stable component supply across multi-year production cycles.

Supply support for STM32H7A3IIT6 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, medical diagnostics, and advanced human-machine interfaces.

FAQ

What is the maximum operating frequency and supported voltage range for STM32H7A3IIT6?

The STM32H7A3IIT6 operates at up to 280 MHz with a supply voltage range of 1.62 V to 3.6 V. At voltages below 2.7 V, the I/O high-speed at low-voltage (HSLV) feature must be enabled for full-speed GPIO operation. The device supports voltage scaling in Run and Stop modes, and includes an embedded SMPS regulator to efficiently generate VCORE from input voltages as low as 1.62 V.

Does STM32H7A3IIT6 support external memory interfaces beyond Octo-SPI?

Yes - it integrates a Flexible Memory Controller (FMC) supporting NOR flash, PSRAM, SRAM, NAND flash (8/16-bit), and SDRAM/LPSDR up to 125 MHz in synchronous mode. The FMC is distinct from Octo-SPI and uses dedicated address/data buses. Both interfaces can operate concurrently, enabling hybrid memory architectures - e.g., Octo-SPI for boot code and FMC for application data storage.

How many CAN interfaces does STM32H7A3IIT6 include, and what protocols do they support?

The STM32H7A3IIT6 includes two CAN FD controllers compliant with ISO 11898-1:2015, supporting data rates up to 5 Mbps and flexible bit timing. One CAN interface also supports time-triggered CAN (TT-CAN) per ISO 11898-4, enabling deterministic scheduling for safety-critical automotive and industrial networks. No third CAN peripheral is present on this variant.

Is the JPEG hardware codec capable of both encoding and decoding operations?

Yes - the integrated JPEG codec supports full hardware-accelerated encoding and decoding of baseline JPEG images (8-bit YUV422/420/444, grayscale) without CPU involvement. It handles Huffman coding/decoding, quantization, IDCT/DCT, and color space conversion, achieving >560 MB/s throughput. Frame size is limited to 8192×8192 pixels, and DMA-driven operation enables streaming from Octo-SPI or FMC memory.