STMicroelectronics STM32H7B3IIK6Q

Overview

STM32H7B3IIK6Q from STMicroelectronics is a 32-bit Arm® Cortex®-M7 microcontroller operating at up to 280 MHz, featuring double-precision FPU, 2 Mbytes of flash memory, 1.4 Mbytes of RAM (including 64 Kbytes ITCM + 128 Kbytes DTCM), and dual Octo-SPI interfaces with on-the-fly AES-128 decryption. It integrates SMPS, cryptographic accelerators (AES/GCM/CCM/SHA/HMAC/RNG), and supports motor control, industrial HMI, and secure IoT edge nodes.

For engineers reviewing the STM32H7B3IIK6Q datasheet, STM32H7B3IIK6Q pinout, STM32H7B3IIK6Q application, or STM32H7B3IIK6Q equivalent, key selection criteria include verified 280 MHz real-time performance, dual-bank flash with RWW, TCM RAM partitioning for deterministic code execution, and hardware JPEG/Chrom-ART acceleration for embedded graphics.

Technical Context

The device 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 enabling sub-cycle access to ITCM/DTCM. Its interconnect matrix comprises one AXI and two AHB bus matrices with 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. Dual Octo-SPI interfaces support SDR/DTR modes up to 140/110 MHz with hardware OTFDEC for external encrypted memory, while FMC supports NOR/PSRAM/SDRAM/NAND.

Key Specifications

Pinout & Package

STM32H7B3IIK6Q is housed in a UFBGA176+25 package (10 mm × 10 mm, 0.65 mm pitch) with 176 signal balls plus 25 dedicated power/ground balls. The package supports full peripheral mapping including dual Octo-SPI, FMC, USB OTG HS/FS, SDMMC, and LCD-TFT controller signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H7B3IIK6Q, STM32H743VIT6 trades integrated power efficiency and external memory security for lower BOM cost, while STM32H753IIK6 extends flash capacity without altering thermal or layout constraints-making it a drop-in upgrade path for memory-bound deployments.

Availability

STM32H7B3IIK6Q is available at Aetrix Electronics and suitable for industrial motor drives, medical imaging subsystems, and secure edge gateways requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STM32H7B3IIK6Q 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 devices for industrial, automotive, and consumer markets.

The STM32H7 series targets high-end embedded applications demanding real-time determinism, rich graphics, hardware security, and multi-interface connectivity-optimized for industrial automation, medical equipment, and advanced human-machine interfaces.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32H7B3IIK6Q achieves 280 MHz via its Arm Cortex-M7 core with six-stage dual-issue pipeline, dynamic branch prediction, and 16 KB instruction/data caches. This frequency requires 1.2 V core voltage (VOS0 range), stable 3.3 V I/O supply, and proper decoupling per datasheet layout guidelines. All timers, ADCs, and communication peripherals scale synchronously with this clock.

Does STM32H7B3IIK6Q support hardware encryption for external memory?

Yes-it integrates two OTFDEC (On-The-Fly Decryption) units supporting AES-128 in CTR mode for both Octo-SPI interfaces. This enables transparent decryption of externally stored firmware or assets from HyperRAM/NOR flash without CPU involvement, preserving bandwidth and security against physical memory extraction.

How does the dual-domain power architecture reduce system power consumption?

The CPU Domain (CD) and Smart Run Domain (SRD) operate independently: CD can enter Retention mode while SRD remains active to handle RTC, tamper events, or low-power peripherals. In Stop mode, current drops to 32 µA with full 1.4 MB RAM retention; Standby draws just 2.8 µA with RTC/LSE active-enabling battery-backed operation for months.

Which packages support the full peripheral set including FMC and dual Octo-SPI?

Only UFBGA176+25 (STM32H7B3IIK6Q), TFBGA225, and LQFP176 packages provide all 168 GPIOs and full signal routing for FMC, dual Octo-SPI, USB OTG HS, SDMMC, and LCD-TFT. Smaller packages like LQFP100 omit FMC and one Octo-SPI interface due to pin count limitations.