STMicroelectronics STM32H533CET6

Overview

STM32H533CET6 from STMicroelectronics is a production-grade Arm® Cortex®-M33 32-bit microcontroller with TrustZone® security, FPU, and 250 MHz max clock frequency. It integrates 512 Kbytes of ECC-protected flash (dual-bank read-while-write), 272 Kbytes of SRAM (80 Kbytes with ECC), and hardware cryptographic accelerators including dual AES coprocessors, PKA, HASH (SHA-1/2/3), and NIST SP800-90B-compliant TRNG. It targets secure industrial control, IoT edge nodes, and smart metering where real-time performance, firmware integrity, and tamper resistance are critical.

For engineers reviewing the STM32H533CET6 datasheet, STM32H533CET6 pinout, STM32H533CET6 application, or STM32H533CET6 equivalent, key selection considerations include TrustZone-aware peripheral partitioning, Octo-SPI on-the-fly decryption support, dual 12-bit ADCs (5 Msps), FDCAN interfaces, and LQFP48 package compatibility with legacy STM32H503/563 footprint constraints.

Technical Context

The STM32H533CET6 implements Armv8-M mainline security with configurable SAU regions and preconfigured immutable root of trust (ST-iROT). Its TrustZone-aware peripherals-including GPDMA, OCTOSPI, FMC, and RCC-are hardware-enforced to isolate secure/non-secure execution environments.

It features dual DMA controllers with FIFO, ART Accelerator with 8-Kbyte instruction cache and 4-Kbyte data cache, and two independent 12-bit ADCs supporting up to 5 Msps with hardware oversampling. The device supports authenticated debug, SESIP3/PSA Level 3 certification, and secure firmware installation (SFI) via TF-M integration.

Key Specifications

Pinout & Package

LQFP48 package with 0.5 mm pitch, exposed thermal pad, and standard JEDEC MO-220 footprint. Pin count and mechanical dimensions align with STM32H503CET6 and STM32H563CET6 for drop-in PCB compatibility in space-constrained industrial designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H563VIT6, the STM32H533CET6 trades memory capacity and peripheral count for LQFP48 footprint and lower BOM cost while retaining full TrustZone, OTFDEC, and PSA Level 3 compliance. Against STM32U575ZIT6, it delivers hardened security primitives essential for regulated markets but consumes more active power.

Availability

STM32H533CET6 is available at Aetrix Electronics and suitable for industrial PLC edge nodes, secure smart metering, IoT gateway controllers, and medical sensor hubs requiring stable component supply across multi-year production cycles.

Supply support for STM32H533CET6 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, analog, and MEMS technologies for industrial, automotive, and consumer markets.

The STM32H5 series is ST's flagship secure MCU product line designed for applications demanding PSA Level 3/SESIP3 certification, hardware-rooted trust, and real-time deterministic performance in hostile environments.

FAQ

Does STM32H533CET6 support crystal-less USB operation?

Yes. The STM32H533CET6 integrates a crystal-less USB 2.0 full-speed transceiver that uses internal clock recovery synchronized to the USB SOF packet. This eliminates the need for an external 48 MHz crystal, reducing BOM cost and PCB area-critical for compact industrial and portable designs where board space is constrained.

What is the maximum operating frequency of the ADC subsystem?

The dual 12-bit ADCs support up to 5 Msps aggregate sampling rate when interleaved. Each ADC achieves 2.5 Msps independently with hardware oversampling and digital filtering. This performance is sustained across the full 1.71–3.6 V supply range and –40°C to +125°C ambient temperature, validated per DS14539 §5.3.22.

How does the OTFDEC engine integrate with external Octo-SPI memories?

OTFDEC sits between the AHB bus and OCTOSPI interface, decrypting data in real time using AES-128/256 keys stored in secure memory. Decrypted content is never exposed on the bus or in SRAM-only plaintext is delivered to CPU/DMA. Key provisioning occurs during secure firmware installation (SFI) and is bound to the device's hardware unique key (HUK).

Is the LQFP48 package of STM32H533CET6 pin-compatible with earlier STM32H503 or STM32H563 variants?

Yes. The STM32H533CET6 shares identical LQFP48 pinout, power sequencing, and reset behavior with STM32H503CET6 and STM32H563CET6. This enables direct replacement in existing designs targeting functional safety or enhanced security without PCB redesign-subject to validation of TrustZone initialization and bootloader updates.