STMicroelectronics STM32H7A3RIT6

Overview

STM32H7A3RIT6 from STMicroelectronics is a 32-bit Arm® Cortex®-M7 microcontroller operating at up to 280 MHz with double-precision FPU, 16 KB instruction/16 KB data cache, and 1 MB flash (dual-bank) + 192 KB TCM RAM (64 KB ITCM + 128 KB DTCM). It integrates dual Octo-SPI interfaces, FMC for SDRAM/NOR/PSRAM, USB OTG HS/FS, 2× CAN FD, LCD-TFT controller, JPEG codec, and Chrom-ART accelerator - deployed in motor control, industrial PLCs, and medical imaging systems.

For engineers reviewing the STM32H7A3RIT6 datasheet, STM32H7A3RIT6 pinout, STM32H7A3RIT6 application, or STM32H7A3RIT6 equivalent, key selection criteria include its 280 MHz real-time performance with deterministic TCM access, dual-bank flash for seamless firmware updates, integrated SMPS support for high-efficiency power delivery, and hardware-accelerated graphics/audio/video peripherals enabling complex HMI and edge AI inference at ultra-low latency.

Technical Context

The STM32H7A3RIT6 implements a six-stage dual-issue Cortex-M7 core with dynamic branch prediction and Harvard architecture, enabling 599 DMIPS at 280 MHz. Its memory subsystem includes AXI/AHB bus matrices, three independent power domains (CPU, SRD, Backup), and configurable voltage scaling across Run/Stop modes.

Peripherals are distributed across four APB buses, three AHB buses, and an AXI interconnect; critical timing functions are supported by 19 timers (including 2× 32-bit general-purpose and 2× advanced motor-control timers), dual ADCs (up to 3.6 MSPS, 16-bit), and two DACs (12-bit single/dual-channel), all synchronized via shared clock trees and low-jitter PLLs.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant ECOPACK2 finish; 51 general-purpose I/Os including 45 5-V-tolerant pins, 6 wakeup-capable pins, and dedicated analog/USB/SDMMC/SMPS supply pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H743VIT6, the STM32H7A3RIT6 trades flash/RAM capacity and Ethernet for integrated SMPS and smaller LQFP64 footprint - optimizing for compact, battery-aware edge nodes. Versus STM32H753VIT6, it omits crypto engines to reduce cost and power, making it ideal for non-security-critical real-time control where deterministic latency outweighs encryption needs.

Availability

STM32H7A3RIT6 is available at Aetrix Electronics and suitable for industrial motor drives, portable medical HMIs, smart building HVAC controllers, and IoT edge gateways requiring stable component supply across multi-year production cycles.

Supply support for STM32H7A3RIT6 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 ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32H7 series targets high-end embedded applications demanding real-time determinism, graphics acceleration, and heterogeneous processing - specifically engineered for motor control, medical imaging, and industrial automation where performance-per-watt and peripheral integration are critical.

FAQ

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

The STM32H7A3RIT6 achieves 280 MHz via its Arm Cortex-M7 core with six-stage dual-issue pipeline and dynamic branch prediction. This frequency is sustained using the internal 64 MHz HSI oscillator multiplied by PLL1 with fractional divider, while L1 caches (16 KB I-cache + 16 KB D-cache) and TCM RAM eliminate wait states. Voltage scaling must be set to VOS0 (1.2 V core) and supply stabilized between 1.62–3.6 V.

Does the LQFP64 package support all peripherals listed in the datasheet?

No - the LQFP64 variant (RIT6) has reduced peripheral availability versus larger packages. It supports only one Octo-SPI interface (OCTOSPI1), no FMC, no SAI, no SPDIFRX, and only 51 GPIOs (vs. 168 in BGA variants). Key retained features include USB OTG FS, 2× CAN FD, LCD-TFT controller, JPEG codec, and all 19 timers - verified in Table 1 of DS13195 Rev 8.

How does the integrated SMPS improve system-level power efficiency?

The integrated SMPS replaces an external buck converter, delivering up to 90% efficiency at 200 mA output current for VCORE. It reduces thermal dissipation by ~40% compared to LDO-based solutions and enables dynamic voltage scaling across Run/Stop modes. The SMPS requires only two external components (inductor + capacitor) and supports automatic bypass to LDO during startup or fault conditions.

Can the STM32H7A3RIT6 execute code directly from Octo-SPI memory?

Yes - the STM32H7A3RIT6 supports XIP (eXecute-In-Place) from Octo-SPI memory via its OCTOSPI1 interface. This allows booting and running application code from external HyperRAM or NOR flash without copying to internal RAM, reducing boot time and conserving 1.18 MB user SRAM for data buffers. XIP requires configuration of OCTOSPI1 timing registers and memory mapping in the AXI bus matrix.