MINIREX_G473

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# STM32G473 Flight Controller (20x20mm)

# NEWS : 
* V2 reduced cost by changing part of the compoment to asian brand, assembly now possible with jlc and lcsc part stock, a price per unit produced graph is disponible below

## Overview
High-performance flight controller based on the **STM32G473** MCU, featuring a compact 20x20mm mounting pattern. This board is specifically designed for high-voltage builds (up to 12S) and high-speed processing, utilizing a 6-layer PCB stackup with all components mounted on a single side for optimal integration and cooling.
## Hardware Visuals

### PCB View (V1)
<img width="1530" height="2040" alt="with_coin" src="https://github.com/user-attachments/assets/c651b9a2-0a40-4f8b-9f05-c5cbd4384ecc" />
### CAD View (V1)

## Technical Specifications
### Core System
* **MCU:** STM32G473 (Cortex-M4, 170MHz)
* **IMU:** ICM-42688-P (Ultra-low noise 6-axis gyro)
* **Blackbox:** 16M-bit (2MB) Onboard Flash
* **PCB:** 6-layer, single-sided compoment

### Power Management
* **Main Buck Regulator:** LMR51625
    * **Input Voltage:** 7V to 55V
    * **Output:** 5V @ 2.5A Max
* **Dual LDO Regulation:** Two independent LDL212PV33R (1.2A each)
    * **LDO 1:** Dedicated to MCU and Flash memory
    * **LDO 2:** Dedicated to the ICM-42688-P sensor for maximum signal purity

### Protection & Hardware Robustness
* **USB Protection:** Integrated **TVS Diodes** (Transient Voltage Suppressors) on the USB port to protect the MCU against electrostatic discharge (ESD) and short-circuits caused by humidity or debris.
* **Filtering:** High-quality ceramic capacitors and dedicated power planes for a low noise floor.

### Connectivity & Interface
* **Connectors:** 2x JST-SH 1.0mm ports (DJI/Digital VTX and ESC)
* **Status LEDs:** 4x Onboard diagnostic LEDs:
    * 2x Betaflight Status (Green/Blue)
    * 1x 3.3V MCU Power
    * 1x 3.3V Sensor Power
    * many soldering pads to add GPS, buzzer, led, or IO

## Cost (BOM)
## Bill of Materials (BOM) Cost Estimation

The following table demonstrates the estimated component costs based on Mouser volume pricing. The unit price of each component dynamically adapts to the total quantity required for the entire production batch (1, 100, or 1000 boards).

*Prices are estimates in USD and do not include PCB manufacturing or assembly costs.*

| Component / Value | Mouser Ref. | Qty/Board | Unit Price (1 Bd) | Unit Price (100 Bds) | Unit Price (1k Bds) | Total 1 Bd | Total 100 Bds | Total 1k Bds |
| :--- | :--- | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
| 100n | 710-885012104005 | 13 | $0.080 | $0.010 | $0.004 | $1.04 | $13.00 | $52.00 |
| 10n | 710-885012104014 | 1 | $0.120 | $0.030 | $0.010 | $0.12 | $3.00 | $10.00 |
| 1u | 710-885012105012 | 3 | $0.180 | $0.060 | $0.030 | $0.54 | $18.00 | $90.00 |
| 4.7u | 710-885012105012 | 3 | $0.180 | $0.060 | $0.030 | $0.54 | $18.00 | $90.00 |
| 0.1u | 81-GRM155R62A104ME4J | 1 | $0.100 | $0.020 | $0.010 | $0.10 | $2.00 | $10.00 |
| 2.2u | 710-885012105007 | 1 | $0.220 | $0.080 | $0.040 | $0.22 | $8.00 | $40.00 |
| 2.2u | 81-GRT21BD72A225KE13 | 2 | $0.240 | $0.090 | $0.050 | $0.48 | $18.00 | $100.00 |
| 47u | 81-GRM21BR61A476ME5K | 2 | $0.550 | $0.220 | $0.120 | $1.10 | $44.00 | $240.00 |
| USB4110-GF-A | 710-629722000214 | 1 | $1.150 | $0.850 | $0.650 | $1.15 | $85.00 | $650.00 |
| LED 150040BS73240 (Blue) | 710-150040BS73240 | 1 | $0.260 | $0.120 | $0.080 | $0.26 | $12.00 | $80.00 |
| LED 150040GS73240 (Green) | 710-150040GS73240 | 1 | $0.260 | $0.120 | $0.080 | $0.26 | $12.00 | $80.00 |
| LED 150040RS73240 (Red) | 710-150040RS73240 | 2 | $0.260 | $0.120 | $0.080 | $0.52 | $24.00 | $160.00 |
| STM32G473CEU6 | 511-STM32G473CEU6 | 1 | $7.580 | $5.450 | $4.800 | $7.58 | $545.00 | $4800.00 |
| 5.1k | 667-ERJ-1GNF5101C | 2 | $0.100 | $0.010 | $0.005 | $0.20 | $2.00 | $10.00 |
| 100k | 667-ERJ-1GNF1003C | 2 | $0.100 | $0.010 | $0.005 | $0.20 | $2.00 | $10.00 |
| 10k | 667-ERJ-1GNF1002C | 3 | $0.100 | $0.010 | $0.005 | $0.30 | $3.00 | $15.00 |
| 1k | 667-ERJ-1GNF1001C | 6 | $0.100 | $0.010 | $0.005 | $0.60 | $6.00 | $30.00 |
| 20k | 667-ERJ-1GNF2002C | 1 | $0.100 | $0.010 | $0.005 | $0.10 | $1.00 | $5.00 |
| 19.1k | 667-ERJ-1GNF1912C | 1 | $0.100 | $0.010 | $0.005 | $0.10 | $1.00 | $5.00 |
| 22R | 667-ERJ-1GNF22R0C | 7 | $0.100 | $0.010 | $0.005 | $0.70 | $7.00 | $35.00 |
| 100R | 667-ERJ-1GNF1000C | 1 | $0.100 | $0.010 | $0.005 | $0.10 | $1.00 | $5.00 |
| Ferrite 74279220800 | 710-74279220800 | 1 | $0.140 | $0.040 | $0.020 | $0.14 | $4.00 | $20.00 |
| Inductor 74479335329247 | 710-74479335329247 | 1 | $0.780 | $0.450 | $0.320 | $0.78 | $45.00 | $320.00 |
| JST SH 6-pin | 306-M06BSRSSTBLFSNPP | 1 | $0.640 | $0.420 | $0.310 | $0.64 | $42.00 | $310.00 |
| LDO LDL212PV33R | 511-LDL212PV33R | 2 | $0.530 | $0.380 | $0.280 | $1.06 | $76.00 | $560.00 |
| Flash MX25R1635FZUIH0 | 95-25R1635FZUIH0TR | 1 | $1.840 | $1.150 | $0.950 | $1.84 | $115.00 | $950.00 |
| TVS SP3222-02ETG | 576-SP3222-02ETG | 1 | $0.420 | $0.220 | $0.150 | $0.42 | $22.00 | $150.00 |
| Switch 435151014824 | 710-435151014824 | 1 | $0.850 | $0.520 | $0.380 | $0.85 | $52.00 | $380.00 |
| MOSFET 2N7002KQBZ | 771-2N7002KQBZ | 1 | $0.180 | $0.060 | $0.030 | $0.18 | $6.00 | $30.00 |
| Osc CSTNE8M00GH5C000R0 | 81-CSTNE8M00GH5C000R | 1 | $0.450 | $0.240 | $0.160 | $0.45 | $24.00 | $160.00 |
| IMU ICM-42688-P | 410-ICM-42688-P | 1 | $4.860 | $3.550 | $2.900 | $4.86 | $355.00 | $2900.00 |
| JST SH 8-pin | 306-SM08BSRSSTB | 1 | $0.720 | $0.480 | $0.350 | $0.72 | $48.00 | $350.00 |
| Diode BAT60JFILM | 511-BAT60JFILM | 2 | $0.280 | $0.110 | $0.060 | $0.56 | $22.00 | $120.00 |
| Buck LMR51625YFDDCR | 595-LMR51625YFDDCR | 1 | $1.250 | $0.880 | $0.650 | $1.25 | $88.00 | $650.00 |
| **TOTAL COST (BOM)** | **-** | **-** | **-** | **-** | **-** | **$29.96** | **$1724.00** | **$13417.00** |
| **AVERAGE PRICE PER BOARD** | **-** | **-** | **-** | **-** | **-** | **$29.96** | **$17.24** | **$13.42** |

## Cost (BOM) V2
V2 version is here for cost optimisation purposes and for the possibility to assemble it completly on jlcpcb with lcsc compoment part, i changed few compoment like Nmos for buzzer or boot button, and i priviledged asian brand here is a graph with the cost per unit according to unit produced :

## Hardware Design Principles
The 6-layer design ensures superior EMI shielding and thermal dissipation. 
stackup: signal-gnd-signal-gnd-power-gnd   
provide shielded power from signal and from the outside.

## Result and test :

### Before reflow : 
<img width="1530" height="2040" alt="before_reflow" src="https://github.com/user-attachments/assets/aa51ef75-ef1f-4845-b730-9b4b98acdefd" />

###  Mounted on apex evo 5 inch :

###  Test in fly :

> La vidéo de démonstration est disponible ici : [DOC/image_v1/video.mp4](./DOC/v1_image/vid.mp4)

## License
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International.

MINIREX_G473

MINIREX_G473 Latest Version Download

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