STMicroelectronics STM32H7B3LIH6Q

Overview

STM32H7B3LIH6Q 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 SDRAM/NAND/NOR, and advanced peripherals including FDCAN, TT-CAN, JPEG codec, LCD-TFT controller, and cryptographic accelerators (AES/GCM/CCM, HASH, RNG). It targets high-performance industrial control and real-time embedded systems requiring deterministic timing and secure firmware execution.

For engineers reviewing the STM32H7B3LIH6Q datasheet, STM32H7B3LIH6Q pinout, STM32H7B3LIH6Q application, or STM32H7B3LIH6Q equivalent, key selection criteria include its 280 MHz Cortex-M7 core with L1 cache, dual-bank flash with RWW, TCM RAM partitioning for time-critical code, Octo-SPI security features, and package-specific peripheral availability in UFBGA176+25 (7×7 mm, 176 balls + 25 ground pads).

Technical Context

The STM32H7B3LIH6Q implements a six-stage dual-issue Cortex-M7 core with Harvard architecture, 16 KB instruction and 16 KB data caches, and tightly coupled memory (64 KB ITCM, 128 KB DTCM) for zero-wait-state deterministic execution. Its interconnect matrix comprises one AXI and two AHB bus matrices, five DMA controllers-including MDMA for high-speed memory-to-memory transfers-and domain isolation between CPU domain (CD) and Smart Run Domain (SRD).

It integrates two independent power domains with voltage scaling, SMPS step-down converter for VCORE supply, and dedicated regulators for USB, SDMMC, and backup SRAM. Security includes ROP/PC-ROP, active tamper detection, secure firmware upgrade, and two OTFDEC AES-128 engines for real-time Octo-SPI memory decryption-enabling secure boot and encrypted external code execution.

Key Specifications

Pinout & Package

STM32H7B3LIH6Q uses the UFBGA176+25 package (7 × 7 mm, 176 signal balls + 25 dedicated ground pads), optimized for high-density PCB layouts and thermal performance in industrial and automotive-adjacent applications. Pin assignments follow ST's standardized ball map for H7B3 series, with dedicated VDD/VSS pairs per power domain, isolated analog supplies (VDDA/VSSA), and configurable I/O banks supporting 5-V-tolerant operation on up to 164 pins.

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 STM32H7B3LIH6Q adds SMPS and OTFDEC for power-efficient secure boot from external flash; versus STM32H753IIK6, it trades LQFP accessibility for UFBGA176+25 density and superior thermal performance in space-constrained designs.

Availability

STM32H7B3LIH6Q is available at Aetrix Electronics and suitable for industrial PLCs, medical imaging edge nodes, smart building HVAC controllers, and secure IoT gateways requiring stable component supply, long lifecycle assurance, and consistent parametric performance across production batches.

Supply support for STM32H7B3LIH6Q 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, cryptographic security, and rich multimedia capability-positioned between mainstream Cortex-M4 and application-processor SoCs.

FAQ

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

The STM32H7B3LIH6Q 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 stable 1.2 V core supply (VDDCORE), proper decoupling, and configuration of PLL1 with HSE or HSI as source. All timers, ADCs, and peripherals derive clocks from this system clock, with optional prescalers maintaining functional integrity at full speed.

Does STM32H7B3LIH6Q support secure firmware updates over-the-air?

Yes-it supports secure firmware upgrades using embedded cryptographic accelerators (AES-GCM, HASH, RNG) and active tamper detection. Firmware images can be authenticated and decrypted in real time using OTFDEC for external flash or verified in internal flash before execution. The bootloader supports FDCAN, USB-DFU, and UART-based update mechanisms with signature checking against public keys stored in OTP memory.

How does the SMPS regulator integrate with the power architecture?

The integrated SMPS steps down input voltage (typically 3.3 V or 5 V) to 1.2 V for VCORE, replacing an external DC-DC converter. It connects directly to VDDSMPS and VSSSMPS pins, with feedback via VFBSMPS and output filtering via external LC components. Its enable/disable is controlled by software or hardware (PWR_CR3 register), and it operates in forced PWM or automatic PFM mode depending on load, achieving >90% efficiency at medium loads.

Which packages include the full peripheral set including dual Octo-SPI and TT-CAN?

Only UFBGA176+25 (STM32H7B3LIH6Q), TFBGA225, and LQFP176 packages support the complete feature set: dual Octo-SPI, TT-CAN, SMPS, OTFDEC, and all 168 GPIOs. Smaller packages like LQFP100 or UFBGA169 omit TT-CAN, reduce GPIO count, and disable one Octo-SPI interface-verified in Table 1 of DS13139 Rev 8 (page 7).