SpeedyBee F405 AIO V2 35/40A Bluejay 25.5x25.5 3-6S Flight Controller (No CNC Case)
by Speedybee

The SpeedyBee F405 AIO V2 35/40A Bluejay 25.5x25.5 3-6S Flight Controller (No CNC Case, SKU: SB-F405AIO-V2) is an ultra-lightweight, high-integration flight controller and 4-in-1 ESC board engineered for 3-inch to 5-inch toothpick builds, cinewhoops, ultralight freestyle quads, and long-range micro drones. Powered by an STM32F405 processor and an ICM-42688P low-noise gyroscope, this board integrates a 35A continuous (40A burst) 4-in-1 ESC running pre-flashed Bluejay JH-40 48kHz firmware with bidirectional DShot support. By omitting the aluminum CNC heatsink enclosure, this "No CNC Case" variant slashes total board mass down to just 8.9 grams while maintaining full 3S to 6S LiPo input compatibility. It features built-in Bluetooth BLE connectivity for full wireless Betaflight configuration and ESC tuning via the SpeedyBee mobile app, an onboard SPA06-003 barometer, 8MB blackbox flash memory, direct plug-and-play DJI Air Unit connectivity, and an external dual-voltage (5V/9V) auxiliary BEC module to reliably power high-drain digital video transmitters and LED strips.

Key Features

• Ultralight 8.9g Naked Profile: Omits the external CNC heatsink shell to reduce weight to 8.9g, maximizing thrust-to-weight ratios on micro and toothpick frames.

• STM32F405 MCU & ICM-42688P Gyro: High-performance processing core paired with a vibration-resistant ICM-42688P IMU for responsive PID loop tracking and flight stability.

• Integrated 35A 4-in-1 ESC with Bluejay: Delivers 35A continuous and 40A peak current per channel, pre-loaded with Bluejay JH-40 48kHz firmware for smooth low-throttle control and RPM filtering.

• Full Wireless Bluetooth Tuning: Integrated Bluetooth BLE module enables field tuning, PID adjustment, motor direction testing, and firmware updates via the SpeedyBee smartphone app.

• Direct DJI O3 / Digital FPV Socket: Dedicated 6-pin SH1.0 port provides plug-and-play wiring for DJI O3 Air Unit, Caddx Vista, Walksnail Avatar, and RunCam Link systems.

• Included External 5V / 9V Auxiliary BEC: Comes with an external plug-in switching regulator board configurable for 5V or 9V output (up to 1.5A) to supply filtered power to video transmitters without overheating the FC.

• Comprehensive Peripheral Support: Features four full UARTs, dedicated I2C pads for compass/barometer expansion, 8MB onboard flash for blackbox data logging, and built-in analog OSD.

• Beginner-Friendly Practice Board: Ships with a replica soldering practice board mirroring the AIO pad layout to help builders master soldering before working on the main board.

Technical Specifications

• Brand / Manufacturer: SpeedyBee

• Model Identifier: SpeedyBee F405 AIO V2 (No CNC Case / Standard Version)

• Manufacturer SKU / Part Number: SB-F405AIO-V2

• Target Application: 2.5" to 4" Toothpicks, 3"–3.5" Cinewhoops, Ultralight 5" Long-Range Quads

• Flight Controller MCU: STM32F405 (32-Bit ARM Cortex-M4, 168 MHz)

• Inertial Measurement Unit (IMU): ICM-42688P (SPI)

• Barometer: SPA06-003 / SPL06-003

• OSD Chip: AT7456E (Analog Betaflight OSD) & HD DisplayPort support

• Blackbox Memory: 8 MB Onboard SPI Flash

• Wireless Connectivity: Bluetooth BLE (SpeedyBee App compatible)

• Firmware Target: SPEEDYBEEF405AIOV2

• Input Voltage Range: 3S – 6S LiPo (11.1V – 25.2V DC)

• ESC Continuous Current (No CNC): 35A per channel (140A total)

• ESC Peak / Burst Current (No CNC): 40A per channel (10 seconds)

• ESC Firmware: Bluejay JH-40 48kHz

• ESC Drive Protocols: DShot300 / DShot600

• Current Sensor: Integrated (Betaflight Scale: 88, Offset: 0)

• Onboard BEC Outputs: 5V / 1.5A (FC & Peripherals) | 4.5V / 1.0A (Receiver via USB)

• External Auxiliary BEC: Selectable 5V / 9V Output (1.5A Max)

• UART Interfaces: 4 Full Sets (UART3, UART4, UART5, UART6) + Inverted SBUS (RX2)

• I2C Bus: Supported (SDA / SCL pads for external compass)

• Buzzer & LED Terminals: Dedicated solder pads for 5V active buzzer and programmable WS2812 LEDs

• Digital FPV Interface: 6-Pin SH1.0 Port (DJI Air Unit compatible)

• USB Interface: External Type-C Extension Module & Solder Pads

• Mounting Pattern: 25.5 mm x 25.5 mm (M2 mounting holes with silicone dampening grommets)

• Dimensions: 33.0 mm x 33.0 mm x 7.0 mm

• Net Weight: 8.9 grams (bare board without CNC heatsink).

What Is Included

• (1) SpeedyBee F405 AIO V2 Flight Controller (No CNC Case, SKU: SB-F405AIO-V2)

• (1) Soldering Practice Board

• (1) External 5V / 9V Dual-Voltage BEC Module

• (1) Power Expansion Board

• (1) External Type-C USB Extension Board with 4-Pin 80mm Cable

• (1) 35V 470µF Low-ESR Electrolytic Capacitor

• (1) XT30 Pre-Crimped Power Cable (70 mm)

• (1) 6-Pin SH1.0 DJI Air Unit Connection Cable (80 mm)

• (1) 6-Pin SH1.0 30mm Cable for External BEC

• (1) 4-Pin 80mm Meteor LED Strip Connection Cable

• (4) M2 x 7.7mm Silicone Vibration Dampening Sleeves

• (4) M2 x 8.4mm Silicone Vibration Dampening Sleeves

• (5) M2 Silicone O-Rings

• (5) M2 Nylon Hex Nuts

• (4) M2 x 12mm Machine Screws

• (4) M2 x 20mm Machine Screws

• (2) Transparent Heat Shrink Tubes

• (2) Black Heat Shrink Tubes for Capacitor

• (1) User Manual & Wiring Diagram.