STMicroelectronics STM32F407IET6

Overview

STM32F407IET6 from STMicroelectronics is a 32-bit Arm® Cortex®-M4 MCU with FPU, operating up to 168 MHz (210 DMIPS), featuring 512 KB flash, 192+4 KB SRAM (including 64 KB CCM), dual CAN 2.0B interfaces, 10/100 Ethernet MAC with IEEE 1588v2 hardware support, and USB OTG HS/FS controllers - deployed in industrial gateways requiring real-time protocol bridging and deterministic network timing.

For engineers reviewing the STM32F407IET6 datasheet, STM32F407IET6 pinout, STM32F407IET6 application, or STM32F407IET6 equivalent, key selection criteria include Ethernet MAC + IEEE 1588v2 hardware timestamping capability, triple 12-bit ADCs (7.2 MSPS interleaved), camera interface (DCMI) bandwidth up to 54 MB/s, and dual CAN with time-triggered communication support.

Technical Context

The STM32F407IET6 integrates an Adaptive Real-Time Accelerator (ART Accelerator) enabling zero-wait-state execution from flash at 168 MHz, paired with a memory protection unit (MPU) for secure task isolation in RTOS environments. Its multi-AHB bus matrix concurrently services CPU, DMA, and peripheral accesses without contention.

It implements dual USB controllers - one full-speed OTG with on-chip PHY, another high-speed OTG with dedicated DMA and ULPI interface - alongside a 10/100 Ethernet MAC with MII/RMII physical layer support and hardware-accelerated IEEE 1588v2 timestamping for sub-microsecond synchronization in industrial automation networks.

Key Specifications

Pinout & Package

LQFP144 package (20 × 20 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant and ECOPACK2 certified. Pin count: 144 leads, including 138 5 V-tolerant I/Os, 3x VDD/VSS power pairs, VCAP_1/VCAP_2 decoupling pins, NRST, BOOT0, and dedicated JTAG/SWD debug pins.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-performance ARM Cortex-M4 microcontroller applications.

Compared with STM32F407VGT6, the STM32F407IET6 offers 44 additional I/Os and full DCMI support in LQFP144; versus STM32H743VIT6, it trades raw performance for deterministic IEEE 1588v2 hardware timestamping - making it preferable for time-critical industrial networking where sub-microsecond jitter matters more than peak MIPS.

Availability

STM32F407IET6 is available at Aetrix Electronics and suitable for industrial gateways, machine vision edge nodes, motor drive controllers, and secure firmware update hubs requiring stable component supply across extended product lifecycles.

Supply support for STM32F407IET6 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, sensors, and automotive ICs with vertical manufacturing capabilities.

The STM32F4-series targets high-performance real-time embedded applications demanding rich connectivity, analog integration, and deterministic timing - especially in industrial automation, medical devices, and consumer electronics requiring USB/Ethernet/CAN convergence.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32F407IET6 achieves 168 MHz maximum CPU frequency using its Adaptive Real-Time Accelerator (ART Accelerator), which caches flash read accesses to eliminate wait states. This requires enabling the prefetch buffer and instruction/data caches in the SYSCFG register. The 168 MHz clock is derived from the main PLL driven by either the 4–26 MHz HSE crystal or 16 MHz HSI RC oscillator.

Does this MCU support hardware-accelerated IEEE 1588v2 timestamping?

Yes - the integrated 10/100 Ethernet MAC includes dedicated hardware registers and logic for inserting and extracting precise timestamps (with nanosecond resolution) into/out of Ethernet frames. This operates independently of CPU load and enables sub-microsecond synchronization accuracy required for time-sensitive networking (TSN) applications without software overhead.

How many ADC channels can be simultaneously sampled at full speed?

Up to 24 channels across three independent 12-bit ADCs, with interleaved mode achieving 7.2 MSPS aggregate sampling rate. Each ADC supports up to 16 external channels plus internal sensors (temperature, VREFINT). Simultaneous sampling uses shared triggers and DMA burst transfers to avoid CPU intervention during acquisition.

What debug interfaces are supported and what are their key capabilities?

The STM32F407IET6 supports both Serial Wire Debug (SWD) and JTAG interfaces. SWD uses only two pins (SWCLK/SWDIO) and supports full breakpoint, watchpoint, and real-time memory access. JTAG adds boundary scan capability and is compatible with legacy ICE tools. Both interfaces integrate with Cortex-M4 Embedded Trace Macrocell (ETM) for instruction trace streaming via SWO pin.