STMicroelectronics STM32H7A3IIK6

Overview

STM32H7A3IIK6 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 NOR/SDRAM/NAND, two 16-bit ADCs (up to 24 channels, 3.6 MSPS), dual DACs, two op-amps, and hardware JPEG codec - deployed in industrial motor control and medical imaging systems.

For engineers reviewing the STM32H7A3IIK6 datasheet, STM32H7A3IIK6 pinout, STM32H7A3IIK6 application, or STM32H7A3IIK6 equivalent, key selection criteria include its 280 MHz Cortex-M7 core with L1 cache, dual-bank flash with read-while-write, SMPS support, 168 GPIOs (164 5-V-tolerant), and integrated LCD-TFT controller with Chrom-ART accelerator.

Technical Context

The STM32H7A3IIK6 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 deterministic real-time execution. Its interconnect uses three bus matrices (1 AXI, 2 AHB) and five DMA controllers including MDMA for high-bandwidth peripheral offload.

It features dual Octo-SPI interfaces supporting SDR/DTR modes up to 140/110 MHz, an FMC with 32-bit data bus for synchronous/asynchronous memories, and dual-domain power management (CPU domain + Smart Run Domain) enabling independent clock gating and sub-32 µA Stop mode with full RAM retention.

Key Specifications

Pinout & Package

STM32H7A3IIK6 is packaged in WLCSP132 (4.57 × 4.37 mm), a wafer-level chip-scale package with 132 solder balls optimized for space-constrained applications. Pin functions are defined per ball position in ST's DS13195 Rev 8, Table 7 ("STM32H7A3xI/G pin/ball definition").

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H7B3IIK6, the STM32H7A3IIK6 prioritizes power efficiency via integrated SMPS and broader low-power mode support, while STM32H743VIT6 trades package size and Octo-SPI capability for wider distributor stock and simpler power design - making each optimal for distinct thermal, security, and layout constraints.

Availability

STM32H7A3IIK6 is available at Aetrix Electronics and suitable for industrial motor control, medical imaging devices, smart building HVAC systems, and wearable health monitor hubs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STM32H7A3IIK6 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 performance, rich connectivity, and graphics acceleration - specifically engineered for motor control, medical diagnostics, and intelligent edge devices with stringent power and security requirements.

FAQ

What is the maximum operating frequency and core configuration of the STM32H7A3IIK6?

The STM32H7A3IIK6 features a 32-bit Arm® Cortex®-M7 core with double-precision FPU, running at up to 280 MHz. It includes 16 KB instruction and 16 KB data caches, 64 KB ITCM RAM, and 128 KB DTCM RAM - delivering 599 DMIPS and 2.14 DMIPS/MHz (Dhrystone 2.1). This configuration enables deterministic real-time execution for complex control algorithms and signal processing tasks.

Does the STM32H7A3IIK6 support external memory interfaces, and which types are supported?

Yes, the STM32H7A3IIK6 supports multiple external memory interfaces: two Octo-SPI controllers (up to 140 MHz SDR / 110 MHz DTR) for HyperRAM, PSRAM, and NOR flash; and a flexible memory controller (FMC) supporting SRAM, PSRAM, NOR, NAND (8/16-bit), and SDRAM/LPSDR. These interfaces enable scalable memory expansion without external logic, critical for imaging, HMI, and data logging applications.

What low-power modes are available, and what is the lowest current consumption in each?

The STM32H7A3IIK6 offers Sleep, Stop, and Standby modes. In Stop mode with full RAM retention, current drops to 32 µA; in Standby mode with Backup SRAM OFF and RTC/LSE ON, it consumes 2.8 µA; with VBAT active (RTC + LSE), consumption is 0.8 µA. Dual-domain power management (CPU Domain + Smart Run Domain) allows selective peripheral activation and independent clock gating to minimize dynamic power.

Is the STM32H7A3IIK6 pin-compatible with other STM32H7 series MCUs, and what package does it use?

The STM32H7A3IIK6 uses the WLCSP132 (4.57 × 4.37 mm) package and is not pin-compatible with LQFP or BGA variants of the H7 family due to differing ball/pin counts and signal mapping. However, it shares identical peripheral sets and register compatibility with other STM32H7A3xI devices (e.g., STM32H7A3IIT6 in LQFP176), enabling software reuse across form factors when migrating to larger packages for prototyping or higher I/O needs.