STMicroelectronics STM32H7A3/7B3 lines of microcontrollers include an Arm® Cortex®-M7 core

STMicroelectronics STM32H7A3/7B3 lines of microcontrollers include an Arm® Cortex®-M7 core


The STM32H7A3/7B3 lines of microcontrollers include an Arm® Cortex®-M7 core (with double-precision floating point unit) running up to 280 MHz.

The STM32H7A3/7B3 MCU lines provides 1 to 2 Mbytes Flash memory, 1.4 Mbytes of SRAM with the following architecture: 192 Kbytes of TCM RAM (including 64 Kbytes of ITCM RAM and 128 Kbytes of DTCM RAM for time-critical routines and data), 1.18 Mbytes of user SRAM, and 4 Kbytes of SRAM in backup domain to keep data in the lowest power modes and 64- to 225-pin packages in BGA and LQFP profiles.


  • 280 MHz fCPU/, 1414 CoreMark /599 DMIPS executing from Flash memory, with 0-wait states thanks to its L1 cache.
  • L1 cache (16 Kbytes of I-cache +16 Kbytes of D-cache) boosting execution performance from external memories.


STM32H7B3 MCUs include the following additional security features:

  • Crypto/hash hardware acceleration
  • On-the-fly decryption on Octo-SPI external serial flash memory
  • Secure Firmware Install (SFI) embedded security services to authenticate and protect your software IPs while performing initial programming.
  • Secure Boot Secure Firmware Update (SBSFU)

Power efficiency

  • Dual-power domain architecture enables each power domain to be set in low-power mode to optimize power efficiency
  • Embedded SMPS to scale down the supply voltage. It can also be used to supply external circuitry and can also be combined with the LDO for specific use cases
  • 120 µA/MHz typical @ VDD = 3.3 V and 25 °C in Run mode (peripherals off) and SMPS
  • 32 µA typical in STOP mode (low-power mode)
  • 2.2 µA typical in Standby mode (low-power mode)
  • 0.74 µA typical in VBAT mode with RTC (low-power mode)


  • LCD-TFT controller interface with dual-layer support
  • Chrom‑ART Accelerator™ boosts graphical content creation while saving core processing power, thus freeing up the MCU for other application needs
  • Chrom-GRC™ optimizes RAM use
  • JPEG hardware accelerator for fast JPEG encoding and decoding, off-loading the CPU

Embedded peripherals

  • Up to 35 communication interfaces including FD-CAN, USB 2.0 high-speed/full-speed, camera interface, Parallel synchronous data input/output slave interface (PSSI)
  • Easily extendable memory range using the flexible memory controller with a 32-bit parallel interface, or the dual Octo-SPI serial Flash memory interface
  • Analog:  Dual 16-bit ADCs
  • Multiple 16- and 32-bit timers running at up to 280 MHz

more information:

Mike is the founder and editor of, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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