STMicroelectronics STM32H523HEY6TR

Overview

STM32H523HEY6TR from STMicroelectronics is a high-security, high-performance Arm® Cortex®-M33 32-bit microcontroller with TrustZone®, 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 supports secure firmware installation (SFI), PSA Level 3 and SESIP3 certification. It targets industrial control systems requiring real-time deterministic execution, cryptographic acceleration, and tamper-resistant boot.

For engineers reviewing the STM32H523HEY6TR datasheet, STM32H523HEY6TR pinout, STM32H523HEY6TR application, or STM32H523HEY6TR equivalent, key selection considerations include TrustZone-aware peripheral configuration, dual-bank flash update capability, 250 MHz timing margin for real-time tasks, and hardware-accelerated ECDSA/SHA-3/HASH for secure edge node authentication.

Technical Context

The device implements an Armv8-M mainline architecture with configurable SAU regions enabling secure/non-secure memory partitioning. Its ART Accelerator includes 8-Kbyte instruction cache and 4-Kbyte data cache to eliminate flash wait states and accelerate external memory access.

Security is enforced at silicon level via Root of Trust (unique boot entry + HDP), active tampers, and dedicated peripherals including PKA, RNG (NIST SP800-90B compliant), and TrustZone-aware GPDMA controllers. Clock management integrates dual PLLs, CRS, and multiple internal oscillators (HSI64, HSI48, CSI, LSI) with precise frequency calibration.

Key Specifications

Pinout & Package

STM32H523HEY6TR is housed in a WLCSP39 package (2.76 × 2.78 mm, 0.4 mm pitch), optimized for space-constrained industrial sensors and wearable edge nodes. The package supports 39 solder balls with defined power, ground, I/O, and debug functions per ST's official pin definition table (DS14540 Rev 3, Table 13).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H523HEY6TR, the STM32H563VIT6 offers greater memory and peripheral breadth at the expense of footprint and cost, while the LPC55S69JBD100 trades security certification and analog performance for lower BOM cost - making the H523HEY6TR optimal for miniaturized, certified industrial edge nodes.

Availability

STM32H523HEY6TR is available at Aetrix Electronics and suitable for industrial PLC edge nodes, secure smart meter gateways, medical wearable sensor hubs, and USB-C power delivery negotiators requiring stable component supply across extended product lifecycles.

Supply support for STM32H523HEY6TR 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, and automotive-grade ICs with over 40 years of industrial IP heritage.

The STM32H5 series is designed specifically for secure, high-performance edge computing in industrial automation, energy infrastructure, and medical devices - emphasizing hardware-rooted trust, real-time determinism, and long-term supply assurance.

FAQ

What is the maximum operating temperature range for STM32H523HEY6TR?

The STM32H523HEY6TR is rated for industrial temperature operation from –40 °C to +105 °C (ambient), validated per DS14540 Rev 3 Section 5.3.1. This range applies to all WLCSP39 variants and ensures reliable operation in enclosed control cabinets, outdoor metering enclosures, and medical equipment housings without forced cooling.

Does STM32H523HEY6TR support hardware-based secure boot without external components?

Yes. It implements a hardware-rooted secure boot chain starting from immutable ROM code, verified boot using SHA-256 and ECDSA signatures, and protected key storage in the HDP (Hide Protection Area). No external secure element or EEPROM is required to achieve PSA Level 3 compliance.

Can the WLCSP39 package be reflow-soldered using standard PCB assembly processes?

Yes. The WLCSP39 (B0MM) package is qualified for standard lead-free reflow profiles (J-STD-020), with peak temperature ≤260 °C and time above liquidus ≤60 seconds. ST provides detailed land pattern and stencil design guidelines in Application Note AN5053 to ensure coplanarity and void-free solder joints.

How many independent clock sources does STM32H523HEY6TR integrate on-die?

It integrates six internal clock sources: 64 MHz HSI, 48 MHz HSI48, 4 MHz CSI, 32 kHz LSI, plus two external oscillator inputs (4–50 MHz HSE and 32.768 kHz LSE). All are accessible via the RCC and support automatic clock recovery (CRS) and failover switching for mission-critical timing resilience.