Md v3
About the Md v3 PCB
Md v3 is an open source STM32 PCB design by 22060, published on GitHub. It is a 4-layer board measuring 49.3 × 49.9 mm, with 85 components from 25 distinct parts.
Its main chip is the STM32G431CBUx, from the STM32 family. Other key parts include the IR2302, ACS711xEXLT-15AB, BD4104 and ADuM1201AR. By type, the board carries 19 capacitors, 19 resistors, 16 diodes, 10 connectors, 9 ICs and 8 transistors.
From the project
git clone https://github.com/22060/2025 --recursive
Main components on the Md v3
Md v3 bill of materials (BOM)
85 components, 25 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | IR2302 | SOIC-8_3.9x4.9mm_P1.27mm | U1, U2, U3, U5 |
| 2 | ACS711xEXLT-15AB | Allegro_QFN-12-10-1EP_3x3mm_P0.5mm | U4, U6 |
| 1 | STM32G431CBUx | QFN-48-1EP_7x7mm_P0.5mm_EP5.6x5.6mm | U9 |
| 1 | BD4104 | SOP-J8 | U10 |
| 1 | ADuM1201AR | SOIC-8_3.9x4.9mm_P1.27mm | U11 |
| 8 | ~ | RD3L07BBG | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 |
| 1 | IQXO-70 | Oscillator_SMD_IQD_IQXO70-4Pin_7.5x5.0mm | X1 |
| 1 | Conn_01x02_Pin | AMASS_XT30PW-M_1x02_P2.50mm_Horizontal | J1 |
| 2 | Conn_01x05_Pin | JST_XH_S5B-XH-A_1x05_P2.50mm_Horizontal | J2, J7 |
| 2 | Conn_01x03_Pin | PinSocket_1x03_P2.54mm_Vertical | J3, J9 |
| 1 | Conn_01x02_Pin | PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | Conn_02x05_Odd_Even | PinHeader_2x05_P2.54mm_Horizontal | J5 |
| 1 | Conn_01x06_Pin | JST_ZH_B6B-ZR_1x06_P1.50mm_Vertical | J6 |
| 2 | Conn_01x02_Pin | AMASS_XT30PW-F_1x02_P2.50mm_Horizontal | J10, J11 |
| 3 | ~ | SOT-89-3 | NJM78L05SU1, NJM78L12SU2, NJM78L33SU1 |
| 4 | D | D_MicroSMP_AK | D1, D2, D3, D4 |
| 8 | D | D_SOD-323_HandSoldering | D5, D6, D7, D8, D9, D10, D11, D12 |
| 4 | LED | LED_0603_1608Metric | D13, D14, D15, D16 |
| 12 | 1u | C_0603_1608Metric | C1, C2, C3, C4, C5, C6, C7, C8 +4 |
| 6 | C | C_0603_1608Metric | C9, C10, C11, C12, C13, C14 |
Show 5 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 330u | C_Elec_10x10.2 | C23 |
| 8 | 10 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2, R5, R6, R8, R9, R11, R12 |
| 8 | 10k | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R4, R7, R10, R15, R16, R17, R18 |
| 2 | R | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R13, R14 |
| 1 | 120 | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R43 |
Md v3 design files
The KiCad project lives in the 22060/2025 repository on GitHub; these links point at the commit this page was built from.
Md v3: common questions
What microcontroller does the Md v3 use?
The Md v3 is built around the STM32G431CBUx, from the STM32 family.
How big is the Md v3 PCB?
The Md v3 measures 49.3 × 49.9 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Md v3?
85 components, from 25 distinct parts. The full bill of materials is listed on this page.
Where can I download the Md v3 design files?
From the 22060/2025 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Md v3 design in my own project?
The repository has no license, so all rights stay with 22060. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Md v3 without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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