Sub250 Redfox A3 F722 45A AIO Flight Controller for DollyFly25

The Sub250 Redfox A3 F722 45A AIO is a high-performance all-in-one board originally designed for the DollyFly25 cinewhoop. Combining a fast STM32F722 processor with a high-capacity 45A ESC, this flight controller delivers the computing power and current headroom required for heavier 2.5-inch to 4-inch builds. It easily handles aggressive freestyle or cinematic flights on up to 6S voltage.

Key features

• Integrates a modern ICM42688P gyro for low-noise, locked-in flight dynamics.
• Robust 45A continuous current rating to safely drive demanding motors on 6S setups.
• Standard whoop-style diagonal mounting pattern fits a wide range of sub-250g and micro frames.
• Ample UARTs and pad layouts designed to support both high-definition digital systems like the DJI O3 Air Unit and traditional analogue gear.

Specifications

• MCU: STM32F722RET6
• Gyro: ICM42688P
• Continuous Current: 45A
• Input Voltage: 2-6S LiPo
• Mounting Pattern: 25.5x25.5mm
• Firmware Target: SUB250F722

While serving as a direct replacement for the Sub250 DollyFly25, the Redfox A3 is an excellent standalone choice for custom builders seeking a resilient 25.5x25.5mm AIO for high-voltage micro drones.