STMicroelectronics STM32H7A3IIT6Q

Overview

STM32H7A3IIT6Q from STMicroelectronics is a 32-bit Arm® Cortex®-M7 microcontroller operating at up to 280 MHz with double-precision FPU, 2 Mbytes of flash memory, 1.4 Mbytes of RAM (including 64 Kbytes ITCM + 128 Kbytes DTCM), and integrated SMPS regulator. It supports dual Octo-SPI interfaces (up to 140 MHz SDR), FMC for NOR/SDRAM/NAND, and advanced analog peripherals including two 16-bit ADCs (3.6 MSPS) and dual DACs. It is deployed in high-performance industrial motor control systems requiring deterministic real-time response and low-latency peripheral access.

For engineers reviewing the STM32H7A3IIT6Q datasheet, STM32H7A3IIT6Q pinout, STM32H7A3IIT6Q application, or STM32H7A3IIT6Q equivalent, key selection criteria include verified 280 MHz CPU frequency with L1 cache, confirmed SMPS integration, validated dual Octo-SPI timing specs (140 MHz SDR / 110 MHz DTR), and package-specific GPIO count (168 I/Os in UFBGA176+25).

Technical Context

The STM32H7A3IIT6Q implements a six-stage dual-issue Cortex-M7 core with Harvard architecture, 16 KB instruction and 16 KB data caches, and tightly coupled memory (64 KB ITCM, 128 KB DTCM) for time-critical routines. Its interconnect uses three bus matrices (1 AXI, 2 AHB) and five DMA controllers-including one high-speed MDMA-to decouple CPU from memory-intensive tasks.

It integrates two independent power domains: CPU Domain (CD) for core/peripherals with retention mode, and Smart Run Domain (SRD) for reset/clock/power management and select peripherals like DAC and DFSDM. The on-chip SMPS step-down converter directly supplies VCORE, enabling efficient operation across 1.62–3.6 V supply range while supporting Stop mode down to 32 µA with full RAM retention.

Key Specifications

Pinout & Package

STM32H7A3IIT6Q is housed in a UFBGA176+25 package (10 × 10 mm, 0.8 mm pitch), featuring 176 signal balls plus 25 dedicated power/ground balls for enhanced thermal and electrical performance in high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H7B3IIT6, the STM32H7A3IIT6Q offers integrated SMPS for improved power efficiency but less flash capacity; versus STM32H743VIT6, it delivers superior memory interface flexibility (dual Octo-SPI + FMC) and smaller footprint (UFBGA vs LQFP), at the cost of reduced I/O count and absence of LCD-TFT controller.

Availability

STM32H7A3IIT6Q is available at Aetrix Electronics and suitable for industrial motor control, medical imaging front-end, smart building HVAC, and industrial PLC communication gateway applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STM32H7A3IIT6Q 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 components 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 instrumentation, and advanced human-machine interfaces.

FAQ

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

The STM32H7A3IIT6Q achieves 280 MHz CPU frequency using its Arm Cortex-M7 core with six-stage dual-issue pipeline, dynamic branch prediction, and 16 KB instruction/data caches. This speed is sustained by the 128-bit embedded flash interface that fills cache lines in a single access, supported by voltage scaling (VOS0) and stable 1.2 V core supply from either internal LDO or integrated SMPS.

Does STM32H7A3IIT6Q support external SDRAM, and what interface is used?

Yes, STM32H7A3IIT6Q supports external SDRAM through its Flexible Memory Controller (FMC) with 32-bit data bus, capable of driving standard SDRAM and LPDDR SDRAM. The FMC operates in synchronous mode up to 125 MHz and supports burst transfers, refresh control, and bank management-enabling up to 512 MB addressable memory space for large buffer or framebuffer applications.

How many analog-to-digital converters does this MCU include, and what are their key capabilities?

The STM32H7A3IIT6Q integrates two 16-bit successive-approximation ADCs, each supporting up to 24 input channels and sampling at up to 3.6 MSPS. They feature hardware oversampling, injected/conversion sequencing, and simultaneous sampling capability-enabling precise multi-sensor acquisition for motor current sensing, power quality monitoring, and medical signal conditioning.

What debug interfaces are supported, and is trace functionality available?

The STM32H7A3IIT6Q supports both SWD and JTAG debug interfaces, with a 4 KB Embedded Trace Buffer (ETB) for real-time instruction and data trace. It also includes ETM (Embedded Trace Macrocell) support for streaming trace via SWO pin or external trace port, enabling non-intrusive profiling and timing analysis of real-time applications without halting CPU execution.