STMicroelectronics STM32H7B3IIT6Q

Overview

STM32H7B3IIT6Q 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, hardware JPEG codec, and cryptographic acceleration (AES-128/192/256, SHA-1/2, HMAC, TRNG). It targets high-performance embedded applications requiring real-time signal processing, graphics rendering, and secure firmware updates - such as industrial HMIs and medical imaging front-ends.

For engineers reviewing the STM32H7B3IIT6Q datasheet, STM32H7B3IIT6Q pinout, STM32H7B3IIT6Q application, or STM32H7B3IIT6Q equivalent, key selection considerations include its 280 MHz CPU frequency, dual-bank flash with read-while-write, TCM RAM partitioning for deterministic code execution, Octo-SPI security features, and support for LCD-TFT controllers up to XGA resolution.

Technical Context

The STM32H7B3IIT6Q implements a six-stage dual-issue Cortex-M7 core with Harvard architecture, 16 KB instruction and 16 KB data caches, and tightly coupled memory interfaces (ITCM/DTCM) enabling sub-cycle memory access for time-critical routines. Its interconnect matrix comprises one AXI and two AHB bus matrices with five DMA controllers - including MDMA for high-speed peripheral-to-memory transfers and DFSDM-dedicated DMA.

It integrates two independent power domains: CPU Domain (CD) and Smart Run Domain (SRD), allowing selective clock gating and retention-mode operation. The device includes an embedded SMPS step-down converter (1.62–3.6 V input), configurable LDO, backup regulator (~0.9 V), and VBAT battery charging capability - supporting ultra-low-power Stop mode (32 µA with full RAM retention) and Standby mode (2.8 µA).

Key Specifications

Pinout & Package

STM32H7B3IIT6Q is housed in a 176-pin LQFP package (24 × 24 mm, 0.5 mm pitch), ECOPACK2-compliant, with 168 GPIOs (164 5-V-tolerant), dedicated VDD/VSS pairs per power domain, and separate supply pads for VDDMMC, VDDSMPS, and VREF+.

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 and STM32H753IIK6, the STM32H7B3IIT6Q uniquely integrates an SMPS regulator and dual OTFDEC-enabled Octo-SPI - making it optimal for cost-sensitive, power-constrained designs needing secure serial memory expansion without external PMICs or encryption co-processors.

Availability

STM32H7B3IIT6Q is available at Aetrix Electronics and suitable for industrial HMIs, medical imaging front-ends, and motor drive controllers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STM32H7B3IIT6Q 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, graphics, security, and energy efficiency - with the H7B3 subfamily specifically optimized for cost-sensitive industrial and medical devices requiring integrated SMPS and Octo-SPI security.

FAQ

What is the maximum operating frequency and supported voltage range for STM32H7B3IIT6Q?

The STM32H7B3IIT6Q operates at up to 280 MHz with a supply voltage range of 1.62 V to 3.6 V. At voltages below 2.7 V, the High-Speed Low-Voltage (HSLV) feature must be enabled on compatible I/Os to maintain timing integrity. The embedded SMPS supports direct VCORE regulation from 1.62 V input, while the LDO provides scalable digital rail output.

Does STM32H7B3IIT6Q support secure firmware updates and cryptographic operations?

Yes - it includes hardware AES-128/192/256 engines (ECB/CBC/CTR/GCM/CCM), HASH (MD5/SHA-1/SHA-2), HMAC, and a NIST SP 800-90B-compliant true random number generator (TRNG). Two OTFDEC modules enable on-the-fly decryption of external Octo-SPI memory, allowing encrypted firmware storage and authenticated boot verification.

How does the dual-bank flash architecture benefit firmware development?

Dual-bank flash enables Read-While-Write (RWW) operation: one bank executes code while the other is erased or programmed. This allows background firmware updates without halting application execution - critical for industrial systems requiring zero-downtime OTA upgrades and fail-safe rollback mechanisms.

What graphics and display capabilities does STM32H7B3IIT6Q provide?

It integrates an LCD-TFT controller supporting resolutions up to XGA (1024×768), Chrom-ART DMA2D hardware accelerator for 2D graphics composition, and a hardware JPEG codec capable of encoding/decoding QVGA images in under 5 ms. The GFXMMU (Chrom-GRC™) enables virtualized framebuffer management for multi-layer GUIs with alpha blending.