STMicroelectronics STM32H7B3AII6Q

Overview

STM32H7B3AII6Q 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, 1.4 Mbytes of RAM (including 64 Kbytes ITCM + 128 Kbytes DTCM), and integrated SMPS regulator. It supports dual Octo-SPI interfaces with on-the-fly AES-128 decryption, FMC for NOR/SDRAM/NAND, and advanced analog peripherals including two 16-bit ADCs (up to 3.6 MSPS) and dual DACs - deployed in industrial motor control and medical imaging systems.

For engineers reviewing the STM32H7B3AII6Q datasheet, STM32H7B3AII6Q pinout, STM32H7B3AII6Q application, or STM32H7B3AII6Q equivalent, key selection criteria include verified 280 MHz real-time performance, dual-bank flash with RWW support, TCM RAM allocation for deterministic ISR latency, Octo-SPI DTR mode timing (110 MHz), and SMPS integration for sub-100 µA Stop-mode operation.

Technical Context

The STM32H7B3AII6Q implements a six-stage dual-issue Cortex-M7 core with Harvard architecture, 16 KB instruction and 16 KB data caches, and L1 cache line fill in one access from 128-bit embedded flash. Its interconnect uses three bus matrices (1 AXI + 2 AHB) and five DMA controllers including MDMA for high-bandwidth peripheral-to-memory transfers.

Memory subsystem includes 2 MB flash with read-while-write, 192 KB TCM RAM (64 KB ITCM + 128 KB DTCM), 1.18 MB user SRAM, and 4 KB backup SRAM. Security features comprise ROP/PC-ROP, active tamper detection, secure firmware upgrade, and two OTFDEC AES-128 engines for external Octo-SPI memory decryption.

Key Specifications

Pinout & Package

STM32H7B3AII6Q is housed in a 169-ball UFBGA package (7 × 7 mm, 0.5 mm pitch) with 121 user I/Os, including 164 5-V-tolerant pins, dedicated VDDMMC supply, and separate VREF+ reference input. The package supports ECOPACK2 environmental compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H7B3AII6Q, STM32H7B0ABI6 omits SMPS and Octo-SPI security to reduce cost and die size, while STM32H743VIT6 trades integrated power and dual-OTFDEC for broader peripheral availability in legacy packaging - making the H7B3AII6Q optimal for space-constrained, secure, and power-autonomous industrial edge nodes.

Availability

STM32H7B3AII6Q is available at Aetrix Electronics and suitable for industrial motor control, portable medical imaging, smart building HVAC, and secure industrial gateways requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STM32H7B3AII6Q 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 determinism, cryptographic integrity, and heterogeneous processing - specifically engineered for industrial automation, medical devices, and secure IoT edge nodes.

FAQ

What is the maximum operating frequency and core configuration of the STM32H7B3AII6Q?

The STM32H7B3AII6Q integrates an Arm® Cortex®-M7 core with double-precision FPU, running at up to 280 MHz. It features 16 KB instruction and 16 KB data caches, 64 KB ITCM RAM, and 128 KB DTCM RAM - enabling deterministic real-time execution with Dhrystone 2.1 performance of 599 DMIPS.

Does the STM32H7B3AII6Q support external memory encryption, and how is it implemented?

Yes - it includes two on-the-fly decryption (OTFDEC) engines supporting AES-128 in CTR mode for both Octo-SPI interfaces. Each OTFDEC decrypts external memory reads transparently, using keys stored in secure OTP or derived from hardware root-of-trust - no CPU involvement required during runtime access.

How does the integrated SMPS impact power efficiency in low-power modes?

The SMPS reduces quiescent current in Stop mode to 32 µA with full RAM retention, versus >100 µA with LDO-only operation. It dynamically adjusts output voltage based on VOS level and CPU load, achieving >90% efficiency at 100 mA - critical for battery-backed industrial controllers.

Which packages and pin counts are available for the STM32H7B3AII6Q, and what I/O capabilities do they offer?

The STM32H7B3AII6Q is exclusively offered in UFBGA169 (7 × 7 mm) with 121 user I/Os. Of these, 164 pins are 5-V-tolerant, and it includes dedicated VDDMMC and VREF+ pads - enabling robust interfacing with legacy sensors and isolated SDIO peripherals without level shifters.