STMicroelectronics STM32H7A3NIH6

Overview

STM32H7A3NIH6 from STMicroelectronics is a 32-bit Arm® Cortex®-M7 microcontroller operating at up to 280 MHz, featuring dual-precision FPU, 16 KB instruction and 16 KB data cache, 2 MB flash, and ~1.4 MB RAM (including 64 KB ITCM + 128 KB DTCM). It integrates two Octo-SPI interfaces, FMC, dual CAN FD, USB OTG HS/FS, JPEG codec, LCD-TFT controller, and SMPS regulator - deployed in motor control, industrial PLCs, and medical imaging systems.

For engineers reviewing the STM32H7A3NIH6 datasheet, STM32H7A3NIH6 pinout, STM32H7A3NIH6 application, or STM32H7A3NIH6 equivalent, key selection factors include verified 280 MHz real-time performance, dual-bank flash with read-while-write, TCM RAM partitioning for deterministic ISR latency, Octo-SPI DTR mode up to 110 MHz, and SMPS integration for sub-3.3 V core supply efficiency.

Technical Context

The STM32H7A3NIH6 implements a six-stage dual-issue Cortex-M7 core with Harvard architecture, dynamic branch prediction, and AXI4/TCM/AMBA AHB interconnects - enabling simultaneous instruction fetch and data access with sub-cycle cache line fill from 128-bit flash. Its memory subsystem includes three bus matrices (1 AXI + 2 AHB), five DMA controllers (including MDMA), and domain isolation between CPU domain (CD) and Smart Run Domain (SRD).

Peripherals are distributed across four APB buses and three AHB domains: two Octo-SPI controllers support HyperRAM/NOR in SDR/DTR modes; FMC handles SRAM/SDRAM/NAND; dual CAN FD + TT-CAN provide time-triggered automotive-grade communication; and the integrated SMPS regulator delivers regulated VCORE from 2.7–5.5 V input with <1% output ripple.

Key Specifications

Pinout & Package

STM32H7A3NIH6 is housed in a UFBGA176+25 package (10 × 10 mm, 1.0 mm pitch), with 176 signal balls plus 25 dedicated ground balls for EMI suppression and power integrity. The package supports 168 GPIOs (164 5-V-tolerant), including high-speed pins rated up to 133 MHz.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H743VIT6, the STM32H7A3NIH6 reduces bill-of-materials cost and PCB area via integrated SMPS and adds Octo-SPI for high-bandwidth external memory - while the i.MX RT1176 offers dual-core flexibility at the expense of missing key H7A3 features like JPEG hardware acceleration and TCM-optimized real-time determinism.

Availability

STM32H7A3NIH6 is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, smart HVAC gateways, and factory automation edge nodes requiring stable component supply across extended product lifecycles.

Supply support for STM32H7A3NIH6 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, rich connectivity, and graphics capability - with the H7A3 variant optimized for cost-sensitive industrial and medical designs requiring integrated SMPS and Octo-SPI memory expansion.

FAQ

What is the maximum operating frequency and supported voltage range for STM32H7A3NIH6?

The STM32H7A3NIH6 operates at up to 280 MHz with a supply voltage range of 1.62 V to 3.6 V. Core voltage is regulated internally via SMPS or LDO; VDD must remain ≥1.62 V using an external supervisor or ≥1.71 V with embedded PVD enabled. Junction temperature is rated to 130°C, with 105°C limit in VOS0 voltage scaling mode.

Does STM32H7A3NIH6 support hardware JPEG encoding and decoding?

Yes, STM32H7A3NIH6 includes a dedicated hardware JPEG codec capable of real-time compression and decompression of YUV422 and RGB565 images. It supports resolutions up to XGA (1024×768) and offloads CPU cycles - validated in ST's AN5130 application note for medical endoscope and industrial camera use cases.

How many Octo-SPI interfaces does STM32H7A3NIH6 have, and what memory types do they support?

STM32H7A3NIH6 has two Octo-SPI interfaces supporting serial PSRAM, NOR flash, HyperRAM, and Hyperflash in both SDR and DTR modes. OCTOSPI1 runs up to 140 MHz in SDR and 110 MHz in DTR; OCTOSPI2 supports identical protocols but shares pins with FMC in muxed configurations per package constraints.

Is the SMPS regulator in STM32H7A3NIH6 configurable for different output voltages?

No - the integrated SMPS regulator is fixed at 1.2 V output for VCORE supply. It accepts 2.7–5.5 V input and provides up to 300 mA output current with <1% ripple. For other core voltages, external regulators must be used; the LDO can be configured to 1.0–1.3 V via VOS bits in PWR_CR3 register.