STMicroelectronics STM32H7S3I8T6

Overview

STM32H7S3I8T6 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 embedded applications requiring real-time control, secure firmware updates, and rich human-machine interface support - such as industrial HMIs and edge AI gateways.

For engineers reviewing the STM32H7S3I8T6 datasheet, STM32H7S3I8T6 pinout, STM32H7S3I8T6 application, or STM32H7S3I8T6 equivalent, key selection considerations include its 600 MHz M7 core with L1 cache, PSA Level 2/SESIP Level 3 security certification, dual 12-bit ADCs (5 MSPS), octo-SPI/XSPI memory interface supporting HyperRAM™ at 200 MHz, and UFBGA176+25 package with 176 I/Os and dedicated VCAP pins for SMPS stability.

Technical Context

The STM32H7S3I8T6 implements a dual-bus AXI/AHB interconnect matrix enabling concurrent CPU, DMA, and peripheral access without contention. Its memory subsystem integrates TCM RAM (64+64 KB), 384 KB AXI SRAM, and flexible external memory controllers (FMC, XSPI) supporting XiP from serial PSRAM/NOR and parallel SDRAM.

Security architecture includes root-of-trust boot via HDP, secure firmware installation (SFI/SFU) powered by embedded RSS, hardware AES coprocessors (one DPA-resistant), PKA for ECC verification, and on-the-fly encryption of external memories using MCE - all validated under PSA Level 2 and SESIP Level 3 certification scope.

Key Specifications

Pinout & Package

STM32H7S3I8T6 is packaged in UFBGA176+25 (10 × 10 mm, 176 signal balls + 25 VSS/VDD balls), optimized for high-density PCB layouts with dedicated VCAP pins for SMPS decoupling and separate analog/digital power domains.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H743VI, the STM32H7S3I8T6 delivers certified security, FD-CAN, and GPU acceleration at higher clock speed - whereas STM32U5A8JDK6 trades raw performance for sub-µA low-power operation and TrustZone-based isolation, making it better suited for intermittent-sensing applications.

Availability

STM32H7S3I8T6 is available at Aetrix Electronics and suitable for industrial HMIs, secure edge gateways, smart camera nodes, and advanced motor drive controllers requiring stable component supply across multi-year production cycles.

Supply support for STM32H7S3I8T6 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 components for industrial, automotive, and consumer markets.

The STM32H7S series is ST's next-generation high-performance secure MCU line targeting applications demanding real-time responsiveness, hardware-accelerated graphics, and PSA-certified security - especially in industrial automation and edge AI endpoints.

FAQ

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

The STM32H7S3I8T6 achieves 600 MHz via its Arm Cortex-M7 core with dual 32 KB L1 instruction and data caches, enabling zero-wait-state execution from embedded flash or external memory. This requires proper VCAP capacitor placement (2.2 µF per pin) and stable 1.1 V VCORE supplied by the integrated SMPS regulator - verified in DS14359 Rev 7 Section 6.3.3.

Does this MCU support hardware-accelerated cryptography for TLS?

Yes - it integrates SAES (secure AES), PKA (public key accelerator for ECC verification), HASH, and RNG (NIST SP800-90B compliant), all used by ST's X-CUBE-SBSFU middleware to perform TLS 1.2/1.3 handshakes with hardware offload. PSA Level 2 certification confirms the cryptographic boundary integrity per DS14359 Section 3.31.

What display interfaces does the STM32H7S3I8T6 support?

It supports LCD-TFT up to XGA (1024×768) resolution via LTDC controller, parallel display interfaces through FMC8/16, and serial displays via octo-SPI with XiP capability. The NeoChrom GPU2D handles rotation, scaling, and perspective-correct texture mapping independently of the CPU - detailed in Sections 3.12 and 3.30 of DS14359.

How many I/O pins are available in the UFBGA176+25 package?

The UFBGA176+25 package provides 176 signal balls plus 25 dedicated VSS/VDD balls, yielding 152 general-purpose I/Os with interrupt capability as specified in Table 3 of DS14359 Rev 7. Pin functions are fully configurable via GPIO alternate function registers and multiplexed across multiple peripherals.