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


  • 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

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.

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