STMicroelectronics STM32H7A3ZIT6Q

Overview

STM32H7A3ZIT6Q 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, 192 Kbytes of TCM RAM (64 Kbytes ITCM + 128 Kbytes DTCM), and integrated SMPS regulator. It targets high-performance embedded applications requiring real-time signal processing, graphics acceleration, and multi-interface connectivity - such as industrial HMI, motor control drives, and IoT edge gateways.

For engineers reviewing the STM32H7A3ZIT6Q datasheet, STM32H7A3ZIT6Q pinout, STM32H7A3ZIT6Q application, or STM32H7A3ZIT6Q equivalent, key selection criteria include its dual-bank flash architecture with read-while-write capability, 168 GPIOs with 133 MHz toggle rate, dual ADCs (up to 3.6 MSPS), hardware JPEG codec, and support for Octo-SPI and FMC external memory interfaces.

Technical Context

The STM32H7A3ZIT6Q implements a six-stage dual-issue Cortex-M7 core with Harvard architecture, 16 KB instruction and 16 KB data caches, and tightly coupled memory interfaces for deterministic real-time execution. Its interconnect matrix comprises one AXI and two AHB bus matrices, five DMA controllers (including MDMA), and domain isolation between CPU and Smart Run Domains (SRD) for independent power gating.

It integrates dual Octo-SPI interfaces supporting SRD/DTR modes up to 140/110 MHz, an FMC controller for NOR/PSRAM/SDRAM/NAND, and advanced analog subsystems including two 16-bit ADCs, two operational amplifiers (8 MHz GBW), two ultra-low-power comparators, and DFSDM filters for sigma-delta modulator interfacing.

Key Specifications

Pinout & Package

LQFP144 (20 × 20 mm) package with 168 I/Os (164 5-V-tolerant), 1.62–3.6 V supply range, and ECOPACK2 compliance. Pin functions validated per DS13195 Rev 8 (Table 7, page 102).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H7B3ZIT6 and STM32H743ZIT6, the STM32H7A3ZIT6Q uniquely combines integrated SMPS, full Octo-SPI/FMC support, and 280 MHz performance in LQFP144 - making it optimal for cost-sensitive, power-aware embedded systems requiring external memory expansion without external PMIC overhead.

Availability

STM32H7A3ZIT6Q is available at Aetrix Electronics and suitable for industrial HMI, motor control drives, medical edge gateways, and smart building HVAC controllers requiring stable component supply across extended product lifecycles.

Supply support for STM32H7A3ZIT6Q 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 performance, graphics acceleration, and heterogeneous peripheral integration - with the H7A3 variant optimized for cost-effective, power-efficient designs leveraging integrated SMPS and compact LQFP packaging.

FAQ

What is the maximum operating frequency and supported voltage range for STM32H7A3ZIT6Q?

The STM32H7A3ZIT6Q 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 low-voltage (HSLV) feature must be enabled for full-speed GPIO operation. The embedded SMPS regulator supports direct VCORE supply down to 0.63 V, enabling dynamic voltage scaling for power optimization.

Does STM32H7A3ZIT6Q support hardware encryption or secure boot features?

Yes - it includes Read-Out Protection (ROP), PC-ROP (Program Counter Read-Out Protection), active tamper detection with dedicated pins, and secure firmware upgrade support. These features enable secure boot chain enforcement and runtime protection against physical and software attacks, compliant with IEC 62443-3-3 requirements for industrial security.

How many Octo-SPI interfaces does STM32H7A3ZIT6Q provide, and what are their speed limits?

The device integrates two Octo-SPI interfaces: OCTOSPI1 and OCTOSPI2. In Single Data Rate (SDR) mode, both support up to 140 MHz; in Double Data Rate (DTR) mode, maximum speed is 110 MHz. Both operate in muxed mode and support serial PSRAM, NOR flash, HyperRAM, and Hyperflash with configurable latency and wrap modes.

Can STM32H7A3ZIT6Q drive an RGB LCD-TFT display directly, and what resolution is supported?

Yes - it includes a dedicated LCD-TFT controller (LTDC) supporting up to XGA resolution (1024 × 768) with 24-bit RGB interface. The controller supports programmable pixel clock, horizontal/vertical synchronization, and alpha blending. Combined with Chrom-ART Accelerator (DMA2D), it enables efficient GUI composition without CPU intervention.