STMicroelectronics STM32MP257FAK3

Overview

STM32MP257FAK3 from STMicroelectronics is a dual-core 64-bit Arm® Cortex®-A35 + Cortex®-M33 microprocessor unit (MPU) operating at up to 1.5 GHz, featuring 512-Kbyte L2 cache, TrustZone® security, and integrated hardware video encoder/decoder supporting H.264/VP8 up to 1080p60. It targets high-performance embedded applications requiring AI acceleration, rich graphics, and multi-interface connectivity - such as industrial HMIs, smart medical displays, and edge gateway controllers.

For engineers reviewing the STM32MP257FAK3 datasheet, STM32MP257FAK3 pinout, STM32MP257FAK3 application, or STM32MP257FAK3 equivalent, key selection criteria include DDR4/LPDDR4 memory interface support (up to 4 Gbytes), PCIe® 5 Gbit/s PHY sharing with USB 3.0 SuperSpeed, triple Gigabit Ethernet with TSN, and optional VeriSilicon® NPU delivering 1.35 TOPS at 900 MHz.

Technical Context

The STM32MP257FAK3 implements a heterogeneous multi-core architecture: two Cortex®-A35 cores (1.5 GHz, 32-Kbyte L1 I/D cache each, 512-Kbyte unified L2 cache) handle Linux-based application workloads, while the Cortex®-M33 (400 MHz, FPU/MPU/TrustZone®) manages real-time control and secure firmware services. A dedicated Cortex®-M0+ core (200 MHz / 16 MHz in autonomous mode) resides in the SmartRun domain for ultra-low-power peripheral management during system standby.

Its interconnect fabric includes a 128-bit STNoC AXI matrix (600 MHz), dual 32-bit AHB buses, and four DMA controllers (48+4 physical channels), enabling concurrent high-bandwidth data movement between DDR, GPU/NPU, video engines, and peripherals including three SDMMC, eight SPI, four SAI, and three FDCAN interfaces - one supporting time-triggered CAN (TTCAN).

Key Specifications

Pinout & Package

VFBGA424 package (14 × 14 mm, 0.5 mm pitch) with 424 solder balls. Ball mapping follows STMicroelectronics' standardized STM32MP25x footprint for mechanical compatibility across the MP25 family.

Key Features

Applications

Equivalent & Alternatives

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

Compared with i.MX 8M Plus and RZ/G2L, the STM32MP257FAK3 uniquely combines PCIe®, TSN Ethernet, and shared USB3/PCIe PHY in a single die - enabling compact gateway designs with deterministic I/O expansion and high-bandwidth peripheral attachment, while maintaining ST's 10-year longevity guarantee.

Availability

STM32MP257FAK3 is available at Aetrix Electronics and suitable for industrial HMIs, edge AI gateways, and medical imaging terminals requiring stable component supply, long lifecycle support, and traceable sourcing through STMicroelectronics' authorized channel.

Supply support for STM32MP257FAK3 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/mixed-signal products for industrial, automotive, and consumer markets.

The STM32MP series targets high-performance embedded Linux applications demanding security, AI acceleration, and rich multimedia - bridging the gap between microcontrollers and application processors with Arm®-based heterogeneous compute and ST's ecosystem of tools and software.

FAQ

What boot sources does the STM32MP257FAK3 support?

The STM32MP257FAK3 supports boot from Octo-SPI flash (with on-the-fly AES decryption), eMMC/SD card, NAND flash via FMC, USB device mode, and UART. Boot mode is selected by BOOT0/BOOT1 pins at reset; the internal 128-Kbyte ROM contains first-stage bootloader (FSBL) with verified cryptographic signature checking.

Does the STM32MP257FAK3 require an external PMIC?

Yes - the STM32MP257FAK3 requires an external PMIC (e.g., STPMIC2 or compatible) to generate its multiple voltage rails: VDDCPU (1.71–1.95 V), VDDGPU (0.75–0.95 V), VDDIO (2.7–3.6 V), DDR_VDDQ (1.2 V), and analog supplies. The on-chip LDOs only support auxiliary domains like RETRAM and BKPSRAM.

How is TrustZone® implemented across the Cortex-A35, Cortex-M33, and Cortex-M0+ cores?

TrustZone® is implemented per-core: Cortex-A35 uses Arm TrustZone® for ARMv8-A (secure/non-secure world isolation), Cortex-M33 uses TrustZone® for Armv8-M (with secure MPU), and Cortex-M0+ runs exclusively in secure state within the SmartRun domain. Secure peripherals (RNG, PKA, SAES) are accessible only via secure bus transactions routed through the BSEC firewall.

Can the STM32MP257FAK3 operate without the optional GPU or NPU enabled?

Yes - the VeriSilicon® GPU and NPU are optional silicon blocks; the STM32MP257FAK3 functions fully with only Cortex-A35/M33/M0+ cores active. Disabling them reduces dynamic power consumption and eliminates associated thermal design requirements, while retaining all other peripherals including video encoder/decoder and display interfaces.