STMicroelectronics STM32H7B3IIK6

Overview

STM32H7B3IIK6 from STMicroelectronics is a 32-bit Arm® Cortex®-M7 microcontroller operating at up to 280 MHz with double-precision FPU, 2 Mbytes of dual-bank flash memory, and ~1.4 Mbytes of RAM (including 64 Kbytes ITCM + 128 Kbytes DTCM). It integrates two Octo-SPI interfaces with on-the-fly AES-128 decryption, FMC for SDRAM/NAND/NOR, and supports CAN FD and TT-CAN - deployed in industrial PLCs and motor control systems requiring deterministic real-time response.

For engineers reviewing the STM32H7B3IIK6 datasheet, STM32H7B3IIK6 pinout, STM32H7B3IIK6 application, or STM32H7B3IIK6 equivalent, key selection factors include verified TCM RAM allocation for time-critical routines, confirmed OTFDEC support for secure external memory, validated dual CAN FD + TT-CAN coexistence, and package-specific peripheral availability (UFBGA176+25).

Technical Context

The STM32H7B3IIK6 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 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 include ROP/PC-ROP, active tamper detection, and two OTFDEC AES-128 engines for Octo-SPI memory encryption/decryption in CTR mode.

Key Specifications

Pinout & Package

STM32H7B3IIK6 is housed in a UFBGA176+25 package (10 × 10 mm, 0.65 mm ball pitch), ECOPACK2-compliant, with 168 GPIOs (164 5-V-tolerant), dedicated VDDMMC and VREF+ pads, and separate SMPS input/output pins (VDDSMPS/VFBSMPS/VLXSMPS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H743VIH6, the STM32H7B3IIK6 adds integrated SMPS and dual OTFDEC for lower system power and secure dual-memory architectures; versus STM32H753IIK6, it omits full NIST-compliant crypto but retains essential OTFDEC and DFSDM for sensor-rich industrial edge nodes.

Availability

STM32H7B3IIK6 is available at Aetrix Electronics and suitable for industrial PLCs, medical imaging systems, smart HVAC controllers, and wearable health monitors requiring stable component supply across extended product lifecycles.

Supply support for STM32H7B3IIK6 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 performance, advanced graphics, and robust security - specifically engineered for industrial automation, medical diagnostics, and intelligent edge devices with stringent power and safety requirements.

FAQ

What is the maximum operating frequency and supported voltage range for STM32H7B3IIK6?

The STM32H7B3IIK6 operates at up to 280 MHz with a supply voltage range of 1.62 V to 3.6 V. Below 1.71 V, an external power supervisor must be used and the PDR_ON pin tied to VSS; otherwise, the internal PVD enforces a minimum of 1.71 V. The device supports dynamic voltage scaling across Run and Stop modes.

Does STM32H7B3IIK6 support secure boot and external memory encryption?

Yes - it supports secure boot via ROP/PC-ROP, active tamper detection, and secure firmware upgrade. For external memory, it includes two independent OTFDEC AES-128 engines in CTR mode, enabling on-the-fly decryption of Octo-SPI NOR/PSRAM/HyperRAM without CPU intervention or exposure of plaintext keys.

How many CAN interfaces does STM32H7B3IIK6 provide, and what protocols are supported?

The STM32H7B3IIK6 integrates three CAN controllers: two support CAN FD (up to 5 Mbps data phase), and one supports time-triggered CAN (TT-CAN) per ISO 11898-4. All three operate independently with dedicated clocks and message RAM, enabling concurrent use in mixed automotive/industrial network topologies.

What peripheral interfaces are available for camera and audio applications?

It provides a 8–14-bit DCMI parallel interface (up to 80 MHz), shared PSSI slave interface, two SAI serial audio interfaces (one with PDM support), six SPI/I2S peripherals (four full-duplex I2S with audio PLL clocking), SPDIFRX, and SWPMI - enabling simultaneous CMOS camera capture, multi-microphone PDM array processing, and HDMI-CEC control in single-chip solutions.