STMicroelectronics STM32F427IIH6

Overview

STM32F427IIH6 from STMicroelectronics is a 32-bit Arm® Cortex®-M4 MCU with FPU, operating up to 180 MHz (225 DMIPS), featuring 2 MB flash, 256+4 KB SRAM (including 64 KB CCM), USB OTG HS/FS, 10/100 Ethernet MAC, and LCD-TFT controller. It integrates Chrom-ART Accelerator™, ART Accelerator™ for zero-wait-state flash execution, and supports industrial HMI, motor control gateways, and networked embedded vision systems.

For engineers reviewing the STM32F427IIH6 datasheet, STM32F427IIH6 pinout, STM32F427IIH6 application, or STM32F427IIH6 equivalent, key selection criteria include dual USB OTG capability (HS + FS), IEEE 1588v2 Ethernet support, parallel camera interface (54 MB/s), triple 12-bit ADCs (7.2 MSPS interleaved), and UFBGA176 package compatibility with high I/O density (168 pins, 166 5 V-tolerant).

Technical Context

The STM32F427IIH6 implements a dual-bank flash architecture enabling true read-while-write operation, paired with an Adaptive Real-time Accelerator (ART) that eliminates flash wait states at 180 MHz. Its memory subsystem includes 64 KB of core-coupled memory (CCM) for time-critical code/data and a flexible external memory controller supporting SDRAM, NOR, NAND, and PSRAM.

It features two independent USB controllers - one full-speed OTG with on-chip PHY, another high-speed OTG with dedicated DMA and ULPI interface - plus a 10/100 Ethernet MAC with hardware IEEE 1588v2 timestamping, MII/RMII physical layer support, and integrated DMA for deterministic real-time networking.

Key Specifications

Pinout & Package

STM32F427IIH6 is housed in a 10 × 10 mm UFBGA176 package with 0.65 mm ball pitch, optimized for high-density PCB layouts and thermal performance in industrial applications. Pin functions are validated per ST's DS9405 Rev 13 datasheet, Table 10 ("STM32F427xx and STM32F429xx pin and ball definitions").

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F427IIH6, STM32F429ZIT6 adds native display driving but sacrifices BGA compactness, while STM32H743VIT6 delivers 2× CPU performance and security extensions at the cost of DCMI removal - making the IIH6 optimal for space-constrained, camera+Ethernet edge nodes requiring balanced real-time I/O and processing.

Availability

STM32F427IIH6 is available at Aetrix Electronics and suitable for industrial HMI gateways, networked motor drives, embedded vision edge nodes, and multi-protocol industrial routers requiring stable component supply across extended product lifecycles.

Supply support for STM32F427IIH6 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 specializing in microcontrollers, power management, sensors, and automotive ICs, with strong focus on industrial and embedded markets.

The STM32F4 series targets high-performance real-time applications demanding rich connectivity, graphics acceleration, and deterministic control - designed specifically for industrial automation, medical devices, and advanced human-machine interfaces.

FAQ

What is the maximum operating frequency and associated performance metric for STM32F427IIH6?

The STM32F427IIH6 operates at up to 180 MHz, delivering 225 DMIPS measured using Dhrystone 2.1 benchmark. This performance is sustained with zero wait states thanks to the ART Accelerator™, which caches flash accesses. The FPU enables efficient floating-point math for motor control and signal processing, and the 180 MHz clock feeds all major peripherals including timers, ADCs, and communication interfaces.

Does STM32F427IIH6 support hardware-based IEEE 1588v2 timestamping for Ethernet synchronization?

Yes, the integrated 10/100 Ethernet MAC includes dedicated hardware timestamping compliant with IEEE 1588v2, achieving sub-100 ns resolution. This enables precise time synchronization across distributed industrial nodes without software overhead. The feature operates independently of CPU load and supports both one-step and two-step clock correction mechanisms, validated in ST's AN4291 application note.

Can STM32F427IIH6 directly interface with a parallel CMOS image sensor?

Yes - it integrates an 8–14-bit Digital Camera Interface (DCMI) supporting up to 54 MB/s throughput, compatible with common OV and AR series sensors. The interface accepts VSYNC/HSYNC/PCLK and 8–14 data lines, with hardware FIFO and DMA triggering. Frame capture is synchronized to PCLK, and the triple ADC can concurrently sample auxiliary analog signals (e.g., temperature, voltage) during imaging.

What are the key power supply requirements and decoupling recommendations for STM32F427IIH6?

The device requires three primary supplies: VDD (1.7–3.6 V), VDDA (same range, filtered analog supply), and VDDIO2 (I/O domain). Critical decoupling includes two 2.2 µF X7R ceramics on VCAP1/VCAP2 pins for internal regulator stability, plus 100 nF ceramics near each VDD/VSS pair. Per Section 6.3.2 of DS9405 Rev 13, VCAP capacitors must be placed within 5 mm of their respective pins with minimal trace inductance.