STMicroelectronics STM32H7A3AII6Q

Overview

STM32H7A3AII6Q 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 1024 KB flash memory. It integrates dual Octo-SPI interfaces (up to 140 MHz SDR), FMC for NOR/SDRAM/NAND, 2x ADCs (16-bit, 24-channel, 3.6 MSPS), and SMPS support - deployed in industrial PLCs, motor drives, and medical imaging subsystems.

For engineers reviewing the STM32H7A3AII6Q datasheet, STM32H7A3AII6Q pinout, STM32H7A3AII6Q application, or STM32H7A3AII6Q equivalent, key selection criteria include verified 280 MHz real-time deterministic execution, dual-bank flash with RWW, TCM RAM partitioning (64 KB ITCM + 128 KB DTCM), and validated SMPS integration for sub-100 µA Stop-mode operation.

Technical Context

The device implements a six-stage dual-issue Cortex-M7 core with Harvard architecture, dynamic branch prediction, and AXI/AHB interconnect matrix supporting concurrent high-bandwidth memory access. Its L1 cache enables single-cycle line fill from 128-bit embedded flash, critical for deterministic interrupt latency below 10 cycles.

Memory subsystem includes 192 KB TCM RAM (64 KB ITCM + 128 KB DTCM) for time-critical code/data, 1.18 MB user SRAM on AHB, and 4 KB backup SRAM - all managed via three independent power domains (CPU domain, Smart Run Domain, and Backup domain) with granular clock gating and voltage scaling.

Key Specifications

Pinout & Package

STM32H7A3AII6Q is housed in a WLCSP132 package (4.57 × 4.37 mm, 0.4 mm pitch), optimized for space-constrained industrial and wearable applications. Pin assignment follows ST's standardized STM32H7A3xI series ballout with dedicated VDDSMPS/VFBSMPS pins for integrated step-down regulator control and separate VDDMMC supply for SDIO robustness.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H7B3IIT6 and STM32H743VIT6, STM32H7A3AII6Q uniquely balances ultra-compact WLCSP packaging, integrated SMPS, and deterministic real-time performance - making it optimal for thermally constrained, battery-aware industrial edge nodes where board space and power budget are non-negotiable.

Availability

STM32H7A3AII6Q is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, smart HVAC gateways, and wearable health monitors requiring stable component supply across extended product lifecycles.

Supply support for STM32H7A3AII6Q 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 STM32H7A3 series belongs to ST's high-performance Cortex-M7 portfolio, engineered specifically for real-time industrial control and portable medical systems demanding integrated power regulation, deterministic latency, and compact packaging.

FAQ

What is the maximum operating frequency and supported voltage range for STM32H7A3AII6Q?

The STM32H7A3AII6Q operates at up to 280 MHz with a core supply range of 1.62 V to 3.6 V. Its integrated SMPS supports VCORE regulation from 1.0 V to 1.2 V, while I/Os tolerate 1.62–3.6 V. The device maintains full functionality down to 1.62 V only when using an external power supervisor and grounding PDR_ON; otherwise, minimum VDD is 1.71 V with internal PVD enabled.

Does STM32H7A3AII6Q support dual-bank flash and read-while-write operation?

Yes - STM32H7A3AII6Q features 1024 KB of dual-bank flash memory enabling true Read-While-Write (RWW) operation. This allows one bank to execute code while the other is being erased or programmed, essential for robust over-the-air (OTA) firmware updates without system interruption or external memory dependency.

How does the integrated SMPS regulator impact system design compared to LDO-based solutions?

The integrated SMPS reduces external component count by eliminating the need for a discrete DC-DC converter, lowering BOM cost and PCB area. It delivers >85% efficiency at 280 MHz load, cutting typical Stop-mode current to 32 µA (vs. ~120 µA with LDO), and enables stable VCORE regulation under dynamic load transients - critical for battery-powered industrial edge nodes.

Which packages and pin counts are available for the STM32H7A3AII6Q variant?

STM32H7A3AII6Q is exclusively offered in the WLCSP132 package (4.57 × 4.37 mm, 0.4 mm pitch) with 132 solder balls. This ultra-compact, fully qualified wafer-level chip-scale package targets space-constrained applications such as wearable health monitors and miniaturized industrial sensors - no LQFP, TFBGA, or UFBGA variants exist for this specific part number.