The 45A Board Is Not Automatically the Better MicoAir AIO
Quick Answer
The 45A MicoAir743v2 AIO is the better choice for a hard-driven 6S build because it combines more current headroom with 32-bit AM32 firmware. The 35A board is not simply the inferior version: it accepts 2S, runs current Bluejay firmware and keeps the same H743 flight-controller hardware in the same 25.5mm mounting pattern.
What the Extra 10A Actually Changes
When we compare the two current MicoAir listings, the flight-controller side is effectively shared. Both use the 480MHz STM32H743VIH6 with 2MB flash, BMI088 and BMI270 IMUs, an SPL06 barometer, microSD logging, seven UARTs, eight motor outputs, 5V/2A and 12V/2A BECs, and an HD-VTX connector for DJI O3, O4 and O4 Pro. Both measure 36 × 36 × 8mm, use 25.5 × 25.5mm M3 mounting and are specified by MicoAir at 10g.
The split is in the integrated ESC. The MicoAir743v2-AIO-35A uses four 35A Bluejay channels and accepts 2–6S. The MicoAir743v2-AIO-45A uses four 45A AM32 channels and accepts 3–6S. Those are continuous ratings that depend on airflow and temperature, not a promise that either board will tolerate any motor-and-prop combination.
Our catalogue exposes a naming trap: the older 45A product handle still contains “blheli_s”, but MicoAir’s current specification identifies its ESC as 32-bit AM32. We would not use that old URL wording to select firmware or a configurator. For the wider MicoAir range, the board manual and the firmware read-back are the authorities.
Bluejay or AM32 Is the Real Decision
Bluejay 0.19.2 and AM32 2.19 both support DShot300, DShot600 and bidirectional DShot. That means either can provide motor-RPM data when the selected flight firmware supports it. Start with DShot300, as MicoAir recommends, and remove the propellers before changing ESC settings.
The practical difference is hardware and configuration. Bluejay is the open-source route for 8-bit ESCs and is configured through ESC Configurator; this 35A implementation is DShot-only. AM32 runs on 32-bit ESC hardware, uses AM32 Configurator and also accepts PWM input. Its extra tuning options and 45A rating make it our pick for a powerful 6S quad, but they do not improve the shared H743 processor, sensor set or I/O.
If the build genuinely needs more current margin, choose 45A. If it uses 2S or modest motors and values a lower-current Bluejay power stage, choose 35A. For the separate-board alternative, our MicoAir743 V2 AIO-versus-stack article explains what a 30.5mm stack adds. Our Bluejay and AM32 flashing article covers the configurator workflow.
What We Would Actually Buy
For a compact 3–4-inch autonomous or HD build with sensible motor current, we would buy the 35A board rather than pay for unused headroom. For a heavier 5-inch 6S aircraft, aggressive propellers or a design already close to 35A per motor, we would take the 45A AM32 version. Check motor test data and cooling rather than choosing from the current number alone; an AIO failure takes both flight control and motor drive out together.
FAQ
Q: Can both boards run ArduPilot, PX4, INAV and Betaflight?
A: Yes. MicoAir lists both for those four flight-firmware families, plus Skybrush. ESC features still depend on the flight firmware: MicoAir currently notes that PX4 and INAV do not support bidirectional DShot on these boards.
Q: Does the 35A board have fewer UARTs?
A: No. Both current V2 AIO specifications list seven UARTs and eight motor outputs. The 35A-versus-45A decision is mainly ESC firmware, current capacity and 2S support.
Q: Can I configure both with the same tool?
A: Not for every setting. Use ESC Configurator for Bluejay and AM32 Configurator for the 45A board’s AM32 firmware. Confirm the detected target before writing firmware.