HAKRC F4520D Mini Flight Controller for FPV Drone – F405, 5 UART, 20x20mm, 3S-6S, DJI Support

The HAKRC F4520D Mini Flight Controller is a compact, high-performance F4 FC designed for lightweight FPV drones using the 20x20mm mounting pattern. Built around the STM32F405RGT6 processor, it features a high-speed ICM42688 gyro, Infineon DPS310 barometer, AT7456E OSD, and a 16MB onboard blackbox, making it a powerful solution for tight builds that don’t compromise on capability.

With 5 UART ports, it offers excellent expansion for GPS, receivers, and peripherals. The Type-C USB interface improves durability and port longevity, while the built-in DJI plug provides seamless compatibility with the DJI FPV Air Unit.

It supports a wide range of receiver protocols including SBUS, ELRS, CRSF, DSMX, iBus, PPM, DUMD, and more—making it suitable for analog and digital FPV systems alike.

🔍 Key Features

• Compact and Powerful

  • 20×20mm mounting pattern, mini 31×28mm form factor

  • Supports 3–6S LiPo input

  • Dual BEC outputs: 5V/3A and 9V/2.5A

• Flight Control Hardware

  • MCU: STM32F405RGT6

  • IMU: ICM42688

  • OSD: AT7456E (SPI2)

  • Barometer: Infineon DPS310 (I2C2)

  • Blackbox: 16MB flash memory

• Connectivity and Compatibility

  • 5 UART ports for flexible expansion

  • DJI FPV Digital Video System plug-and-play support

  • Type-C USB interface for reliable connection and easier configuration

  • Compatible with Betaflight Configurator

• Receiver Protocols Supported

  • SBUS, CRSF, ELRS, PPM, DSMX, iBus, DUMD

📐 Specifications

Whether you're building a micro freestyle quad or a digital HD cinewhoop, the HAKRC F4520D Flight Controller combines essential performance with minimal size, offering stability, versatility, and ease of integration.