Mini Stack: H743 Mini FC + 50A Mini ESC 4 in 1 20x20 hole

FPV Electronics > Stack & AIO

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Ultra-compact flight control and power solution designed for high-thrust 3–5" FPV drones.

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Mini Stack: H743 Mini FC + 50A Mini ESC 4-in-1 Technical Brief

System Overview

Ultra-compact flight control and power solution designed for high-thrust 3–5" FPV drones. Combines the computational power of STM32H743 with high-efficiency AT32-based ESC control in a 20×20mm stackable footprint. Features 8S battery support, dual-sensor redundancy, and advanced noise suppression for precision flight dynamics in compact builds.

1. Flight Controller Specifications

Parameter	Specification
MCU	STM32H743VIT6 (480MHz Cortex-M7, 1MB RAM) :cite[1][5]
IMU	ICM-42688-P (SPI, 32kHz gyro) + BMI270 (backup) :cite[1][3]
Blackbox	32GB microSD (SDIO, 10kHz logging) :cite[1][2]
Input Voltage	2–8S LiPo (7.4–33.6V) :cite[1][5]
BEC Outputs	5V@3A (FC/peripherals) + 9V@2.5A (VTX) :cite[1]
Connectivity	8x UART, 2x I²C, 1x CAN, 1x Bluetooth :cite[1][4]
USB Interface	Type-C (ESD protected) :cite[1]
OSD Chip	AT7456E (Betaflight/INAV OSD) :cite[1][2]
Barometer	DPS310 (±0.002hPa accuracy) :cite[1][2]
Board Size	28.2×28.1mm (20×20mm mounting) :cite[1][2]
Board Weight	7.8g (with silicone gaskets) :cite[1]

2. 50A 4-in-1 ESC Specifications

Parameter	Specification
MCU	AT32F435RGT7 (288MHz Cortex-M4) :cite[5]
Continuous Current	50A/channel (200A total)
Burst Current	65A/channel (5 sec)
Protocols	DShot1200, Proshot, BiDirectional DShot
Input Voltage	2–8S LiPo (7.4–33.6V)
Current Sensor	±1% accuracy shunt resistors :cite[5]
Switching Freq	48kHz (ultra-low EMI)
Board Size	30×30mm (20×20mm stackable)
Board Weight	18.5g (with thermal paste)

3. Combined Features

Power System

• Integrated PDB: Direct 8S battery distribution with 100A continuous rating :cite[1][5]
• Surge Protection: 35V TVS diodes + ceramic capacitors :cite[4]
• Triple-Stage Filtering: LC + π-filter + ferrite beads (>95% noise reduction) :cite[3][4]
• Stackable Design: Gold-plated 20×20mm M2 screw terminals :cite[1]

Integration

• DJI/O3 Air Unit Support: Plug-and-play 9V BEC with anti-spark :cite[3][5]
• ESC Telemetry: Real-time monitoring via UART8 (BLHeli_32) :cite[1]
• Wireless Tuning: Bluetooth for Betaflight/INAV configuration :cite[1]
• Dual IMU Redundancy: Automatic failover to backup gyro :cite[3][4]

4. Safety Features

Flight Controller Protections

Protection Type	Specification	Implementation
Voltage Spike Protection	35V cont. / 45V transient	TVS diodes + multi-stage LC filter :cite[4]
Gyro Vibration Damping	>10kHz reduction by 95%	Silicone isolators + dynamic notch :cite[1][3]
Dual Power Inputs	5V@3A + 5V@2A (backup)	Auto-switching circuit :cite[4]
Sensor Redundancy	Dual IMU + barometer	Priority-based failover :cite[3][4]

ESC Protections

Protection Type	Threshold	Response Time	Trigger Condition
Hardware Overcurrent	65A per channel	≤1.5 seconds	MOSFET overload
Software Overcurrent	50A continuous	≤8 seconds	Sustained high current
Short Circuit	Hardware Isolation	<40μs	Phase-to-phase fault
Over-temperature	115°C (MOSFET)	<0.5ms	Thermal cutoff
Low Voltage Cutoff	2.9V/cell (adj.)	<30ms	Battery depletion
Desync Protection	Auto timing advance	<10μs	Motor sync loss