STMicroelectronics STM32F427AIH6

Overview

STM32F427AIH6 from STMicroelectronics is a 32-bit Arm® Cortex®-M4 microcontroller 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 dual CAN 2.0B interfaces - deployed in industrial HMI controllers requiring real-time graphics, connectivity, and deterministic I/O.

For engineers reviewing the STM32F427AIH6 datasheet, STM32F427AIH6 pinout, STM32F427AIH6 application, or STM32F427AIH6 equivalent, key selection criteria include its 17 timers (12×16-bit + 2×32-bit), triple 12-bit ADCs (7.2 MSPS interleaved), LCD-TFT controller (up to 4096×2048), Chrom-ART Accelerator™, and UFBGA169 package with 166 5 V-tolerant I/Os.

Technical Context

The STM32F427AIH6 integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from flash at 180 MHz, alongside a Memory Protection Unit (MPU) and dual-bank flash supporting read-while-write. Its multi-AHB bus matrix enables concurrent access to flash, SRAM, and peripherals without contention.

It features a dedicated Ethernet MAC with IEEE 1588v2 hardware timestamping, dual USB OTG controllers (one with on-chip HS PHY + ULPI support), and a flexible external memory controller (FMC) supporting SDRAM, NOR, NAND, and PSRAM - enabling complex embedded systems with external display buffers and network stacks.

Key Specifications

Pinout & Package

STM32F427AIH6 is housed in a 169-ball Ultra-Fine-Pitch Ball Grid Array (UFBGA169) package with 0.5 mm ball pitch and 7 mm × 7 mm body size. The package supports 166 5 V-tolerant I/Os and includes dedicated power/ground balls for analog/digital domains and VCAP stabilization.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F427AIH6, STM32F429ZIT6 trades Ethernet and USB HS for identical display capability in a larger, easier-to-solder package, while STM32F767ZIT6 upgrades CPU performance and cache but removes integrated Ethernet MAC and increases power consumption.

Availability

STM32F427AIH6 is available at Aetrix Electronics and suitable for industrial HMI controllers, medical imaging gateways, smart energy meter hubs, and automotive diagnostic tools requiring stable component supply, long lifecycle assurance, and ECOPACK2 environmental compliance.

Supply support for STM32F427AIH6 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 ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32F4-series targets high-performance embedded applications demanding real-time processing, rich connectivity, and advanced graphics - optimized for deterministic control, protocol bridging, and human-machine interaction in resource-constrained environments.

FAQ

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

The STM32F427AIH6 achieves 180 MHz maximum CPU frequency using its Adaptive Real-time Accelerator (ART Accelerator™), which implements prefetch and branch prediction to eliminate flash wait states. This requires proper VCAP capacitor placement and stable 1.7–3.6 V supply; the core delivers 225 DMIPS at this speed under Dhrystone 2.1 benchmark conditions.

Does STM32F427AIH6 support external SDRAM, and what interface does it use?

Yes, STM32F427AIH6 supports external SDRAM via its Flexible Memory Controller (FMC) with full 32-bit data bus capability. It implements standard SDRAM command sequences (ACTIVATE, READ, WRITE, PRECHARGE, AUTO REFRESH) and supports up to 256 MB density with programmable timing parameters including tRCD, tRP, tRC, and CAS latency.

How many 5 V-tolerant I/Os does the UFBGA169 package provide?

The STM32F427AIH6 in UFBGA169 package provides up to 166 5 V-tolerant I/Os across its GPIO ports (PA–PI). These pins tolerate 5 V logic levels while powered from 1.7–3.6 V VDD, simplifying interface to legacy peripherals and industrial buses without level shifters - confirmed in Section 6.3.17 of DS9405 Rev 13.

Is the LCD-TFT controller present in STM32F427AIH6, and what resolution does it support?

No, the LCD-TFT controller (LTDC) is exclusive to the STM32F429xx series and is not implemented in STM32F427xx devices like the AIH6. The F427 supports only the parallel LCD interface (8080/6800 modes) for character or segment-based displays - not full RGB TFT panels. This distinction is explicitly stated in Section 3.10 of the datasheet.