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04-line sub

tuton-RCJ·2025PCB·1-TOKYO/04-line_sub/04-line_sub.kicad_pcb

04-line sub PCB layout, top view — open source STM32 board by tuton-RCJ

About the 04-line sub PCB

04-line sub is an open source STM32 PCB design by tuton-RCJ, published on GitHub under the MIT license. It is a 2-layer board measuring 71.1 × 35.6 mm, with 25 components from 13 distinct parts.

Its main chip is the STM32F446RETX, from the STM32 family. By type, the board carries 10 capacitors, 7 resistors, 5 connectors, 1 IC, 1 diode and 1 inductor.

From the project

基板・回路のリポジトリです。

基板はすべてKiCAD7.0で設計し、JLCPCB様に発注しています。 1-TOKYOが東東京ノード大会で使用した基板です。 2-KANTOは関東ブロック大会で使用した基板です。 3-NAGOYAは名古屋全国大会で使用した基板です。

Main components on the 04-line sub

STM32F446RETX

04-line sub bill of materials (BOM)

25 components, 13 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32F446RETX
STM32F446RETx
U1
1
CONN_01X06
Conn_01x06
J1
1
WRITER CONN
J2
1
CS_R
J3
1
CONN_01X18
Conn_01x18
J4
1
CS_L
J5
1
C2297
LED_GREEN
D1
1
C1015
FerriteBead
FB1
7
100N
100n
C1, C3, C4, C5, C6, C8, C9
2
4.7U
4.7u
C2, C7
1
1u
C10
6
10K
10k
R1, R2, R4, R5, R6, R7
1
470
R3

04-line sub design files

The KiCad project lives in the tuton-RCJ/2025PCB repository on GitHub; these links point at the commit this page was built from.

04-line sub: common questions

What microcontroller does the 04-line sub use?

The 04-line sub is built around the STM32F446RETX, from the STM32 family.

How big is the 04-line sub PCB?

The 04-line sub measures 71.1 × 35.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 04-line sub?

25 components, from 13 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the 04-line sub design files?

From the tuton-RCJ/2025PCB repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the 04-line sub design in my own project?

Yes, under the terms of its MIT license, which tuton-RCJ chose for the repository.

Can I test firmware for the 04-line sub 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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