STMicroelectronics STM32H7S3I8K6

Overview

STM32H7S3I8K6 from STMicroelectronics is an Arm® Cortex®-M7 32-bit microcontroller operating at up to 600 MHz, featuring 64 KB flash, 620 KB SRAM (548 KB with ECC), dual FD-CAN interfaces, Ethernet MAC, and hardware-accelerated graphics (NeoChrom GPU2D + Chrom-ART DMA2D). It targets high-performance industrial HMI, secure edge gateways, and real-time vision-enabled control systems.

For engineers reviewing the STM32H7S3I8K6 datasheet, STM32H7S3I8K6 pinout, STM32H7S3I8K6 application, or STM32H7S3I8K6 equivalent, key selection criteria include FD-CAN timing compliance, TCM RAM allocation for deterministic code execution, on-the-fly external memory encryption capability, and PSA Level 2/SESIP Level 3 security certification status.

Technical Context

This MCU integrates a dual-bank Arm Cortex-M7 core with tightly coupled memory (64+64 KB TCM), L1 instruction/data caches (32+32 KB), and dual-port DMA controllers optimized for concurrent peripheral-to-memory transfers. Its clock system includes PLLs supporting precise USB/Ethernet timing and a dedicated 48 MHz HSI48 oscillator for USB OTG operation.

The device implements a hierarchical memory architecture: AXI SRAM (384 KB), backup SRAM (4 KB), and flexible external memory controller supporting SDR/LPSDR SDRAM, NOR/NAND, and octo-SPI HyperRAM™ at up to 200 MHz. Security is enforced via Root of Trust, Secure Hide Protection Area (HDP), and two DPA-resistant AES coprocessors.

Key Specifications

Pinout & Package

STM32H7S3I8K6 is packaged in VFQFPN68 (10 × 10 mm, 0.5 mm pitch), a thermally enhanced quad flat no-lead package suitable for space-constrained industrial and automotive applications requiring robust thermal performance and EMI resilience.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-performance secure MCU applications.

Compared with STM32H753VI and RA8T1A002FGB, the STM32H7S3I8K6 uniquely balances FD-CAN timing precision, PSA-certified security, and hardware-accelerated graphics-making it optimal for compact, secure, real-time HMI and edge gateway designs where external memory encryption and deterministic rendering are mandatory.

Availability

STM32H7S3I8K6 is available at Aetrix Electronics and suitable for industrial HMI panels, secure edge gateways, real-time vision controllers, and automotive diagnostic tools requiring stable component supply across multi-year production cycles.

Supply support for STM32H7S3I8K6 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, specializing in microcontrollers, power management, sensors, and automotive ICs with vertical manufacturing and broad IP licensing.

The STM32H7S series is designed for secure, graphics-rich, real-time edge devices-emphasizing PSA/SESIP-certified security, FD-CAN timing determinism, and hardware-accelerated 2D graphics for industrial and automotive human-machine interfaces.

FAQ

What is the maximum operating frequency and associated CoreMark score?

The STM32H7S3I8K6 operates at up to 600 MHz with a measured CoreMark score of 3196 (5.33 CoreMark/MHz), validated under full cache and TCM enablement per ARM CoreMark benchmark v1.0. This reflects deterministic execution with zero-wait-state flash access enabled by 32+32 KB L1 instruction/data caches.

Does this MCU support hardware-accelerated JPEG encoding or decoding?

Yes, the STM32H7S3I8K6 includes a dedicated hardware JPEG codec supporting both encoding and decoding of baseline JPEG streams up to QVGA resolution at real-time frame rates. The codec operates independently of the CPU and interfaces directly with DMA2D and memory controllers for zero-copy processing.

How is security certification verified for production units?

Each STM32H7S3I8K6 wafer lot undergoes PSA Level 2 and SESIP Level 3 conformance testing per GlobalPlatform standards, with certification documentation (GP-TEE-001, SESIP-003) published on ST's official product page. Certification applies to silicon, ROM bootloader, and embedded secure services-not customer firmware.

What external memory interfaces support execute-in-place (XiP) operation?

The STM32H7S3I8K6 supports XiP exclusively through its octo-SPI interface (XSPI), which can run at up to 200 MHz with HyperRAM™/HyperFlash™ frame formats. The hexa-SPI variant does not support XiP; parallel FMC interfaces require code relocation to internal SRAM or TCM for execution.