STMicroelectronics STM32H7B3ZIT6

Overview

STM32H7B3ZIT6 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 integrated SMPS regulator. It supports dual Octo-SPI with on-the-fly AES-128 decryption, FMC for NOR/SDRAM/NAND, and advanced peripherals including FDCAN, TT-CAN, JPEG codec, LCD-TFT controller, and hardware cryptographic acceleration (AES/GCM/CCM/SHA/HMAC/RNG). Used in industrial PLCs, motor drives, and medical imaging subsystems.

For engineers reviewing the STM32H7B3ZIT6 datasheet, STM32H7B3ZIT6 pinout, STM32H7B3ZIT6 application, or STM32H7B3ZIT6 equivalent, key selection criteria include verified 280 MHz real-time performance, dual-bank flash with RWW, TCM RAM partitioning for deterministic ISR latency, Octo-SPI DTR mode timing (up to 110 MHz), and SMPS integration for <3.3 V core supply efficiency.

Technical Context

The STM32H7B3ZIT6 implements a dual-bus matrix architecture with one AXI and two AHB interconnects, enabling concurrent CPU, DMA, and peripheral access without contention. Its Cortex-M7 core includes 16 KB instruction and 16 KB data caches, L1 cache line fill from 128-bit flash in single cycle, and MPU-enforced memory isolation across CPU domain (CD) and Smart Run Domain (SRD).

It integrates two independent Octo-SPI controllers supporting SDR/DTR modes (140/110 MHz), each with dedicated OTFDEC AES-128 engines, plus an FMC supporting synchronous NOR/PSRAM (125 MHz), SDRAM, and 8/16-bit NAND. The SRD domain hosts RTC, backup SRAM, low-power timers, and one DFSDM filter - all operable during Stop mode with 2.8 µA consumption.

Key Specifications

Pinout & Package

LQFP144 package (20 × 20 mm, 0.5 mm pitch), ECOPACK2-compliant, with exposed thermal pad. Pin functions validated per DS13139 Rev 8 Table 7 (STM32H7B3xI pin/ball definition) and RM0455 Section 7.2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H7B3ZIT6, the STM32H743VIT6 trades SMPS integration and Octo-SPI security for Ethernet and higher clock speed, while the STM32H753ZIT6 extends cryptographic primitives without altering power or memory architecture - making the H7B3 optimal for cost-constrained, power-sensitive, secure-boot designs.

Availability

STM32H7B3ZIT6 is available at Aetrix Electronics and suitable for industrial PLCs, medical imaging subsystems, smart HVAC gateways, and secure IoT edge nodes requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STM32H7B3ZIT6 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 ICs, sensors, and automotive semiconductors since 1987.

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

FAQ

What is the maximum operating frequency and supported voltage range for STM32H7B3ZIT6?

The STM32H7B3ZIT6 operates at up to 280 MHz across an ambient temperature range of −40 °C to +85 °C, 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 to maintain functionality - otherwise, the internal PVD enforces a 1.71 V minimum.

Does STM32H7B3ZIT6 support secure firmware updates and tamper detection?

Yes. It supports secure firmware upgrades via embedded Secure Access Mode, active/passive tamper pins (TAMP1–TAMP3), and hardware-based AES-128/192/256 with GCM/CCM modes. The PC-ROP feature prevents code-reuse attacks, and backup SRAM is erased upon active tamper event - all confirmed in DS13139 Section 4.3 and RM0455 Chapter 42.

How many Octo-SPI interfaces does STM32H7B3ZIT6 have, and what encryption modes do they support?

The STM32H7B3ZIT6 includes two independent Octo-SPI interfaces, each with a dedicated OTFDEC AES-128 engine operating in CTR mode. Both support on-the-fly decryption of external flash during XIP execution, with SDR mode up to 140 MHz and DTR mode up to 110 MHz - verified in DS13139 Table 1 and Section 4.4.3.

Is the LQFP144 package of STM32H7B3ZIT6 pin-compatible with other STM32H7B3 variants?

No - pin compatibility is limited to same-package variants (e.g., STM32H7B3VIH in LQFP100 is not pin-compatible with STM32H7B3ZIT6 in LQFP144). Peripheral mapping differs across packages; Table 7 in DS13139 confirms only 97 of 168 GPIOs are available on LQFP144, with specific constraints on FMC and OCTOSPI signal routing.