STMicroelectronics STM32H7B3IIT6

Overview

STM32H7B3IIT6 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 cryptographic acceleration (AES-128/192/256, HASH, RNG). It targets high-performance embedded applications such as motor control, industrial PLCs, and medical imaging systems requiring deterministic real-time response and secure firmware execution.

For engineers reviewing the STM32H7B3IIT6 datasheet, STM32H7B3IIT6 pinout, STM32H7B3IIT6 application, or STM32H7B3IIT6 equivalent, key selection criteria include its dual Octo-SPI interfaces with on-the-fly decryption, SMPS support for efficient power conversion, 280 MHz CPU clock with L1 cache, and dual-domain power management enabling sub-3 µA standby current with full SRAM retention.

Technical Context

The STM32H7B3IIT6 implements a Harvard-architecture Cortex-M7 core with six-stage dual-issue pipeline, dynamic branch prediction, and separate 16 Kbytes instruction and data caches-enabling single-cycle cache-line fill from 128-bit flash. Its interconnect matrix comprises one AXI and two AHB bus matrices with five DMA controllers, including a high-speed MDMA for offloading CPU-intensive transfers.

It integrates two independent power domains-CPU Domain (CD) and Smart Run Domain (SRD)-with configurable voltage scaling, dedicated SMPS regulator, and backup domain supporting RTC and 4 Kbytes of battery-backed SRAM. Peripheral routing leverages 5× AHB2APB and 3× AXI2AHB bridges, enabling concurrent high-bandwidth access to flash, SRAM, and external memories via FMC and dual Octo-SPI.

Key Specifications

Pinout & Package

LQFP176 package (24 × 24 mm, 0.5 mm pitch) with exposed thermal pad; 168 I/O pins, 164 of which are 5-V-tolerant; includes dedicated VDDSMPS/VFBSMPS pins for integrated step-down converter, VDDMMC for isolated SDIO supply, and VREF+ for precision ADC reference.

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 STM32H7B3IIT6 trades Ethernet for integrated SMPS and lower standby current; versus STM32H753IIK6, it offers identical performance at lower cost but omits advanced security peripherals like firewall and secure boot ROM.

Availability

STM32H7B3IIT6 is available at Aetrix Electronics and suitable for industrial motor control, medical imaging edge nodes, smart building HVAC systems, and secure IIoT gateways requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STM32H7B3IIT6 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 products for industrial, automotive, and consumer markets.

The STM32H7 series targets high-end embedded applications demanding real-time determinism, rich connectivity, and hardware security-specifically engineered for motor control, industrial automation, medical devices, and advanced human-machine interfaces.

FAQ

What is the maximum operating frequency and supported voltage range for STM32H7B3IIT6?

The STM32H7B3IIT6 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 I/O high-speed at low-voltage (HSLV) feature must be enabled for full-speed operation on compatible pins. The device supports three voltage scaling ranges (VOS0–VOS2) to optimize performance versus power consumption.

Does STM32H7B3IIT6 support external SDRAM, and what interfaces are available for external memory expansion?

Yes, the STM32H7B3IIT6 supports external SDRAM via its Flexible Memory Controller (FMC), which handles SDRAM/LPSDR SDRAM, NOR flash, PSRAM, and 8/16-bit NAND flash. It also provides two Octo-SPI interfaces supporting HyperRAM, serial NOR/PSRAM, and on-the-fly AES decryption-enabling high-bandwidth, secure external memory expansion up to 140 MHz in SDR mode.

How many analog-to-digital converters does STM32H7B3IIT6 integrate, and what are their key resolution and sampling capabilities?

The STM32H7B3IIT6 integrates two 16-bit ADCs with up to 24 input channels and a maximum sampling rate of 3.6 MSPS. Both ADCs support hardware oversampling, injected/conversion sequencing, and synchronization with timers. They operate in the main voltage domain and share common analog inputs, enabling precise multi-sensor acquisition for motor control and industrial monitoring.

Is STM32H7B3IIT6 pin-compatible with other STM32H7-series MCUs, and what package options are offered?

The STM32H7B3IIT6 is offered exclusively in LQFP176 (24 × 24 mm) and is not pin-compatible with LQFP100 or TFBGA variants of the H7 family. Pin compatibility exists only within the STM32H7B3xI subfamily sharing the same package footprint-e.g., STM32H7B3VIT6 (LQFP100) and STM32H7B3ZIT6 (LQFP144) have different pin counts and signal mappings.