Redfox A3 45A AIO
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Bring uncompromising power and high-speed processing to your next 2-inch to 3.5-inch build with the Sub250 Redfox A3 45A AIO. Designed to perfectly fuse “lightweight” with “high performance,” this all-in-one board pairs a top-tier F722 processor with a robust 45A BLHeli_32 ESC, all packed into a remarkably light 8.7g footprint.
F722 Processing & Digital HD Ready
Say goodbye to CPU bottlenecks. The STM32F722 MCU delivers exceptional computing performance and real-time response, ensuring your quad flies exactly how you command it. Building a digital rig? The Redfox A3 features a dedicated DJI 6-Pin interface, allowing for a direct, plug-and-play connection to your DJI O3 or digital video transmission system without messy soldering.
Smart External USB-C Design
Tired of struggling to plug a USB cable into a buried flight controller? Sub250 solved this by including an independently designed Type-C adapter board. This remote USB dongle (with an integrated boot button) connects via a flexible cable, allowing you to mount your USB port anywhere on your frame for incredibly easy access during field tuning.
Robust 45A BLHeli_32 ESC
Push your micro motors to the absolute limit. The onboard ESC handles a massive 45A of continuous current (55A Burst) and supports 2S all the way up to 6S LiPo power. Utilizing authentic BLHeli_32 firmware, it supports up to 128kHz PWM frequencies, providing buttery-smooth motor control, high efficiency, and the reliability you need for aggressive freestyle or racing.
Key Features:
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Powerhouse Processor: STM32F722 MCU combined with the modern ICM42688-P gyro.
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Heavy-Duty ESC: 45A Continuous / 55A Burst on 2-6S power.
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Plug & Play Digital: Onboard 6-pin connector for DJI Air Units.
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Remote USB-C: Independent Type-C dongle makes accessing Betaflight effortless.
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Maximum Expansion: 6 UARTs and a robust 5V 2.5A BEC for all your peripherals.
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Universal Fit: Standard 25.5×25.5mm mounting pattern.
Specifications:
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MCU: STM32F722
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IMU (Gyro): ICM42688-P
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Continuous Current: 45A
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Burst Current: 55A (10s)
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Input Voltage: 2S – 6S LiPo
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ESC Firmware: BLHeli_32 (Supports Dshot300/600)
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OSD: Built-in AT7456E
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Barometer: Built-in
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UARTs: 6 Sets
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BEC Output: 5V 2.5A
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Mounting Pattern: 25.5mm x 25.5mm (M3 holes reduce to M2 with grommets)
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Dimensions: 33.5mm x 33.5mm x 6.45mm
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Weight: 8.7g
What’s in the Box?
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1x Sub250 Redfox A3 45A AIO
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1x External USB-C Port Module (150mm wire)
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1x 6-Pin DJI Air Unit Connecting Cable
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1x XT30 16AWG Power Cable (70mm)
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1x 35V 470uf Capacitor
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10x M2*6.5 Anti-Vibration Silicone Grommets (5x Black, 5x Red)
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5x M2x10 Screws
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8x M2 Nylon Nuts
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1x Manual & Support Card
