STMicroelectronics STM32H7B3QIY6QTR

Overview

STM32H7B3QIY6QTR 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 features two 16-bit ADCs (up to 3.6 MSPS), dual DACs, and cryptographic acceleration (AES/GCM/SHA/HMAC/RNG). It targets high-performance embedded control in motor drives and industrial HMI.

For engineers reviewing the STM32H7B3QIY6QTR datasheet, STM32H7B3QIY6QTR pinout, STM32H7B3QIY6QTR application, or STM32H7B3QIY6QTR equivalent, key selection criteria include verified Octo-SPI DTR mode timing (≤110 MHz), TCM RAM allocation for real-time ISR latency, SMPS integration for power efficiency, and confirmed 132-ball WLCSP package pin mapping for PCB layout.

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 deterministic TCM access paths-enabling sub-100 ns interrupt response for time-critical control loops. Its interconnect matrix comprises one AXI and two AHB bus matrices with five DMA controllers, including MDMA for zero-CPU-overhead memory transfers between Octo-SPI and internal SRAM.

Power management includes two independent domains (CPU domain and Smart Run Domain), with dedicated regulators (SMPS, LDO, backup) and low-power modes down to 2.8 µA (Standby) and 0.8 µA (VBAT). Security features include ROP/PC-ROP, active tamper detection, secure firmware upgrade, and two OTFDEC engines for external memory encryption.

Key Specifications

Pinout & Package

Package: WLCSP132 (4.57 × 4.37 mm), 0.4 mm pitch, ECOPACK2-compliant. Designed for space-constrained industrial and wearable applications requiring minimal PCB footprint and thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H743VIT6, the STM32H7B3QIY6QTR delivers integrated power conversion and dual OTFDEC-enabled Octo-SPI for secure XIP - reducing component count and enhancing boot integrity. Against STM32H753IIK6, it trades Ethernet for ultra-compact WLCSP packaging - prioritizing size and thermal performance over wired connectivity.

Availability

STM32H7B3QIY6QTR is available at Aetrix Electronics and suitable for industrial motor control, medical imaging front-ends, secure gateways, and high-resolution HMIs requiring stable component supply across extended temperature ranges (−40 to +85 °C) and long production lifecycles.

Supply support for STM32H7B3QIY6QTR 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, cryptographic security, and graphics capability - with the H7B3 variant optimized for compact, power-efficient designs featuring integrated SMPS and dual Octo-SPI.

FAQ

What is the maximum supported Octo-SPI DTR clock frequency for STM32H7B3QIY6QTR?

The device supports Octo-SPI DTR mode up to 110 MHz, validated per DS13139 Rev 8 Table 91. This requires proper PCB layout (matched trace lengths, controlled impedance ≤50 Ω), VDD ≥ 2.7 V, and HSLV feature disabled. Performance is confirmed with Micron MT35XU02GCBA1G12-1.2A HyperRAM in DTR x8 configuration.

Does STM32H7B3QIY6QTR support hardware-based secure boot from external flash?

Yes - it integrates two OTFDEC AES-128 engines that decrypt Octo-SPI memory traffic in real time. When combined with ROP, PC-ROP, and secure bootloader in internal flash, it enables authenticated and encrypted XIP execution from external NOR/HyperRAM without exposing plaintext firmware.

How does the SMPS regulator impact thermal design compared to LDO-based alternatives?

The integrated SMPS reduces power dissipation by up to 40% versus LDO solutions at 280 MHz operation. For example, at 3.3 V input and 1.2 V VCORE @ 300 mA, SMPS efficiency exceeds 88%, limiting junction temperature rise to <15 °C above ambient - enabling fanless operation in sealed enclosures.

Can the TCM RAM be used for both instruction and data storage simultaneously?

Yes - the 64 KB ITCM is dedicated to instruction fetches only, while the 128 KB DTCM serves data accesses exclusively. Both are accessible concurrently with zero wait states, allowing separation of time-critical ISR code (in ITCM) and fast data buffers (in DTCM) without cache coherency overhead.