STMicroelectronics STM32F427IIT6

Overview

STM32F427IIT6 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), dual USB OTG (FS/HS), 10/100 Ethernet MAC, and LCD-TFT controller. It targets high-performance embedded applications requiring real-time control, graphics rendering, and industrial connectivity - such as programmable logic controllers with HMI display and EtherCAT gateway functionality.

For engineers reviewing the STM32F427IIT6 datasheet, STM32F427IIT6 pinout, STM32F427IIT6 application, or STM32F427IIT6 equivalent, key selection considerations include its 17-timer suite (including advanced-control TIM1/TIM8), triple 12-bit ADCs (7.2 MSPS interleaved), Chrom-ART Accelerator™ for DMA2D-based GUI acceleration, and dual CAN 2.0B interfaces for robust fieldbus integration.

Technical Context

The STM32F427IIT6 implements an Arm Cortex-M4 core with hardware FPU and ART Accelerator™ enabling zero-wait-state execution from flash at 180 MHz. Its memory subsystem includes two-bank flash supporting read-while-write, 64 KB CCM RAM for time-critical code/data, and flexible external memory controller (FMC) for SDRAM/NOR/NAND expansion.

Peripheral architecture integrates dual USB OTG controllers (one with on-chip FS PHY, one with dedicated HS DMA and ULPI support), IEEE 1588v2-capable Ethernet MAC with MII/RMII, and a parallel 8–14-bit DCMI interface capable of 54 MB/s camera data capture - all synchronized via a multi-AHB bus matrix and 16-stream DMA controller with FIFO buffering.

Key Specifications

Pinout & Package

LQFP176 package: 176-pin quad flat package with 0.4 mm pitch, exposed thermal pad, RoHS-compliant ECOPACK2 finish, suitable for industrial PCB assembly and thermal management via bottom-side copper pour.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F429ZIT6, the STM32F427IIT6 omits the LTDC block - reducing gate count, power, and cost where external display controllers or simpler segment LCDs are used. Against STM32F469NIH6, it trades MIPI-DSI and extended graphics features for smaller LQFP176 packaging and lower system-level thermal design requirements.

Availability

STM32F427IIT6 is available at Aetrix Electronics and suitable for industrial automation, medical imaging gateways, and smart energy infrastructure requiring stable component supply, long-term lifecycle assurance, and ECOPACK2 environmental compliance.

Supply support for STM32F427IIT6 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.

The STM32F4 Series targets high-performance embedded applications demanding DSP capability, rich connectivity, and real-time graphics - designed specifically for industrial HMI, motor control, and protocol gateway systems requiring deterministic latency and peripheral integration.

FAQ

What is the maximum operating frequency and associated performance metric?

The STM32F427IIT6 operates at up to 180 MHz with a measured performance of 225 DMIPS (Dhrystone 2.1), achieving 1.25 DMIPS/MHz. This rating is validated under conditions including ART Accelerator™ enabled, zero-wait-state flash execution, and FPU active - confirmed in ST's DS9405 Rev 13 datasheet Section 3.1.

Does this MCU support hardware encryption or secure boot features?

The STM32F427IIT6 does not integrate dedicated cryptographic accelerators (AES, SHA, PKA) or tamper-detection circuitry. Secure boot must be implemented in software using its TRNG, CRC unit, and flash protection bits (WRP, RDP). For hardware-assisted security, ST recommends migrating to STM32H7 or STM32L5 series MCUs.

Can the Ethernet MAC operate in RMII mode with external PHY, and what pins are required?

Yes, the Ethernet MAC supports RMII mode using 12 dedicated pins: TX_EN, TXD0/TXD1, RXD0/RXD1, REF_CLK, CRS_DV, RX_ER, and MDIO/MDC. These are mapped to GPIO pins PA1–PA3, PB11–PB13, PC1–PC4, and PA0 per Table 10 of DS9405 Rev 13 - enabling compact 2-layer PCB designs with common RMII PHYs like LAN8720A.

Is the LQFP176 package of STM32F427IIT6 lead-free and RoHS-compliant?

Yes, the STM32F427IIT6 in LQFP176 package is manufactured with ECOPACK2-compliant materials and processes, meeting RoHS Directive 2011/65/EU and REACH SVHC requirements. The "T6" suffix explicitly denotes lead-free, halogen-free, and green molding compound - verified in ST's official packaging documentation (Doc ID027172).