STMicroelectronics STM32H7A3ZIT6

Overview

STM32H7A3ZIT6 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, and ~1.4 Mbytes of RAM (including 64 Kbytes ITCM + 128 Kbytes DTCM). It integrates dual Octo-SPI interfaces, FMC for SDRAM/NOR/PSRAM, two ADCs (16-bit, 3.6 MSPS), two DACs, USB OTG HS/FS, two CAN FD controllers, and LCD-TFT controller - deployed in industrial PLCs, motor drives, and medical imaging systems.

For engineers reviewing the STM32H7A3ZIT6 datasheet, STM32H7A3ZIT6 pinout, STM32H7A3ZIT6 application, or STM32H7A3ZIT6 equivalent, key selection criteria include its 280 MHz Cortex-M7 core with L1 cache, SMPS-integrated power architecture, dual-bank flash with RWW, 168 GPIOs (164 5-V-tolerant), and support for time-critical real-time control via TCM RAM and hardware accelerators (DMA2D, JPEG, DFSDM).

Technical Context

The STM32H7A3ZIT6 implements a six-stage dual-issue Cortex-M7 core with Harvard architecture, 16 KB instruction and 16 KB data caches, and deterministic access to 64 KB ITCM/128 KB DTCM RAM. Its interconnect matrix comprises three bus matrices (1 AXI + 2 AHB) and five DMA controllers including MDMA for high-bandwidth peripheral-to-memory transfers.

Power management features two independent domains (CPU domain and Smart Run Domain), enabling selective clock gating and retention modes. It supports voltage scaling across Run/Stop modes, includes an integrated SMPS step-down converter (for VCORE), and delivers 32 µA Stop current with full RAM retention - optimized for embedded applications requiring both high compute throughput and dynamic power adaptation.

Key Specifications

Pinout & Package

STM32H7A3ZIT6 is housed in a 144-pin LQFP package (20 × 20 mm, 0.5 mm pitch), RoHS-compliant and ECOPACK2 certified. Pin functions are validated per STMicroelectronics DS13195 Rev 8 (pages 42–61) and RM0455 reference manual.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H7A3ZIT6, the H7B3IIT6 extends flash and security for secure edge AI inference, while the H743VIT6 trades SMPS and dual Octo-SPI for richer multimedia I/O - making the H7A3 optimal for space-constrained, power-aware industrial gateways requiring serial memory scalability.

Availability

STM32H7A3ZIT6 is available at Aetrix Electronics and suitable for industrial PLCs, medical imaging subsystems, and smart energy gateways requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.

Supply support for STM32H7A3ZIT6 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 automotive semiconductors since 1987.

The STM32H7 series targets high-end embedded applications demanding real-time performance, rich connectivity, and advanced graphics - with the H7A3 variant specifically optimized for cost-sensitive industrial and medical designs requiring integrated SMPS and dual Octo-SPI memory expansion.

FAQ

What is the maximum operating frequency and supported voltage range for STM32H7A3ZIT6?

The STM32H7A3ZIT6 operates at up to 280 MHz with a core supply 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 device supports voltage scaling in Run and Stop modes, and includes an embedded SMPS regulator to efficiently generate VCORE from higher input rails.

Does STM32H7A3ZIT6 support hardware encryption or secure boot features?

Yes - it includes Read-Out Protection (ROP) and Privileged Code Read-Out Protection (PC-ROP) to prevent unauthorized firmware extraction, plus active tamper detection and secure firmware upgrade mechanisms. While it lacks AES-256 or PKA accelerators found in the H7B3 series, its ROP/PC-ROP implementation meets IEC 62443-3-3 SL2 requirements for secure bootloader validation and runtime code integrity checks.

How many Octo-SPI interfaces does STM32H7A3ZIT6 provide, and what memory types do they support?

The STM32H7A3ZIT6 integrates two independent Octo-SPI interfaces, each supporting SDR and DTR modes up to 140 MHz and 110 MHz respectively. They natively interface with HyperRAM, PSRAM, serial NOR flash, and Octal Flash devices using standard frame formats - eliminating need for external memory controllers or glue logic in memory-intensive applications like firmware overlays or graphics asset streaming.

Can STM32H7A3ZIT6 drive an LCD-TFT display directly, and what resolution is supported?

Yes - it features a built-in LCD-TFT controller (LTDC) supporting resolutions up to XGA (1024×768) with 24-bit RGB output, HSYNC/VSYNC/DE signaling, and pixel clock up to 80 MHz. Combined with the Chrom-ART DMA2D accelerator, it renders GUIs with alpha blending and image rotation in hardware, reducing CPU load by >90% compared to software-based rendering - ideal for responsive HMI in medical and industrial panels.