The HAKRC F405 Mini Stack offers a compact yet powerful flight control and ESC solution for FPV drone enthusiasts. Featuring the STM32F405RET6 processor and ICM42688 gyro, this stack delivers responsive and reliable flight performance. Available in four ESC variants — 35A (8-bit), 40A, 60A, and 65A (32-bit) — it is perfect for freestyle and racing drones requiring robust 20x20mm stack components with advanced BLHeli support.
This flight controller supports 2–6S input voltage (up to 8S for 60A/65A), 5 UART ports, and integrated BEC of 5V/2.5A and 10V/2A. The stack is compatible with popular digital systems and offers precise motor control with PWM, Oneshot, Multishot, and DShot protocols.
Key Features
Flight Controller (F405 MINI)
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Processor: STM32F405RET6
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Gyroscope: ICM42688
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Mounting: 20×20mm (Board size: 29×29mm)
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Weight: 6g
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BEC: 5V/2.5A, 10V/2A
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Storage: 16MB
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Input Voltage: 2–6S
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UART Ports: 5
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Firmware: HAKRCF405V2
ESC Options
| ESC Version | Size (mm) | Weight | Mounting | Input Voltage | Continuous Current | Peak Current | MCU Bit | Current Scale | ESC Firmware Version | Config Software |
|---|---|---|---|---|---|---|---|---|---|---|
| 35A | 31 × 30 | 6g | 20×20mm | 2–6S | 35A | 40A | 8-Bit | 300 | G_H_20-Rev.16.7-Multi | BLHeliSuite 16.7.14.9.0.3 |
| 40A | 31 × 29.5 | 6g | 20×20mm | 2–6S | 40A | 45A | 32-Bit | 300 | HAKRC-40-K42_Multi_32.8.HEX | BLHeliSuite32Activator_32.9.0.3 |
| 60A | 34 × 42.5 | 11g | 20×20mm | 2–8S | 60A | 70A | 32-Bit | 160 | HAKRC_AT4G_Multi_32.9.Hex | BLHeliSuite32Activator_32.9.0.3 |
| 65A | 34 × 42.5 | 11g | 20×20mm | 2–8S | 65A | 70A | 32-Bit | 160 | HAKRC_AT4G_Multi_32.9.Hex | BLHeliSuite32Activator_32.9.0.3 |
All ESCs support PWM, Oneshot125, Oneshot42, Multishot, Dshot150, Dshot300, Dshot600 protocols.
Details

Hakrc F4520V2 flight controller wiring diagram. Includes ESC, barometer, GPS, SBUS receiver, VTX, camera connections. Highlights 10V power supply, battery (VBAT), and control switch functionalities.

Hakrc 8B35A four-in-one ESC interface diagram. Dimensions: 31mm x 30mm. Ports labeled M1, M2, M3, M4.

Hakrc 3B40A four-in-one ESC interface diagram. Dimensions: 31mm width, 29.5mm height, 20mm bottom width. Ports labeled M1, M2, M3, M4.

Hakrc 3220 60A four-in-one ESC interface diagram with dimensions: 34mm, 42.6mm, 20mm.

Hakrc 3220 65A 4-in-1 ESC interface diagram. Dimensions: 34mm width, 42.6mm height, 20mm bottom width. Ports labeled M1, M2, M3, M4.

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