2 layers30.1 × 20.8 mm
2 layers46.9 × 34.3 mm
Mcu board backup20260115
fstp/mcu_boardJust a project for me to learn some PCB design
- Size
- 46.9 × 34.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 35
- Pads
- 127
- Tracks, vias
- 247, 43
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 20 Jan 2026
- Updated
- 20 Jan 2026
Overview
Mcu board backup20260115 is an open-source printed circuit board by fstp, from the fstp/mcu_board repository on GitHub, published under the MIT licence. It is a 2-layer board of 46.9 × 34.3 mm with 34 parts on 35 nets, routed with 247 tracks and 43 vias.
It is built around the LP5912-3.3DRVR, TPS25200DRVR and USBLC6-2SC6. Its parts include 8 resistors, 5 capacitors, 4 ICs, 2 connectors and 1 transistor. It belongs with the microcontroller boards and interfaces and adapters boards and the STM32 boards of this library.
Main components
3
LP5912-3.3DRVR
WSON-6-EP(2x2)-40℃~+125℃@(Tj) 1 12uVrms 180mV@(500mA) 3.3V 30uA 500mA 6.5V 75dB@(1kHz) Fixed Over Temperature Protection、Reverse connection protection、Soft Start、Short Circuit Protection Positive WSON-6-EP(2x2) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
TPS25200DRVR
WSON-6-EP(2x2)-40℃~+125℃ 2.5A 2.5V~6.5V 70mΩ Active High High Side Switch Overvoltage protection、Output discharge function、Soft-start、Under-voltage lockout、Overcurrent Protection、Over temperature protection、Short-Circuit Protection、Reverse current blocking WSON-6-EP(2x2) Power Distribution Switches ROHSTexas InstrumentsSupervisor And Reset ICs
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
README
README.mdA minimal STM32F042 development board for learning hardware design.
Overview
mcu_board is a simple, custom-designed breakout board for the STM32F042 microcontroller. The goal of this project is to iterate on a prototype and try out different things, practice KiCad workflow, USB hardware implementation, STM32 firmware bring-up and so on. I choose the STM32F042 because it's simple to program using the USB bootloader (DFU) but in a later revision I will break out the SWD pins so that it can be programmed with a STLink debugger/programmer.
Key Features
Microcontroller: STM32F042 (ARM Cortex-M0)
Connectivity: USB 2.0 Full Speed (Type-C but should be replaced with a Type-A for compatibility with the DFU bootloader)
I/O: Full GPIO breakout to standard 2.54mm headers
Power: USB-powered (5V converted to 3.3V via LDO)
Debug: SWD (Serial Wire Debug) header for programming via ST-LinkParts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | TestPoint | TestPoint:TestPoint_Pad_1.0x1.0mm | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9 |
| 2 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C1, C6 |
| 2 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | 1uF | Capacitor_SMD:C_0402_1005Metric | C2, C5 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R3, R4 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | 3V3, MCU |
| 2 | SW_Push | Button_Switch_SMD:SW_SPST_B3U-1100P-B | BOOT1, RESET1 |
| 1 | 150 | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 200 | Resistor_SMD:R_0402_1005Metric | R6 |
| 1 | 22uF | Capacitor_SMD:C_0402_1005Metric | C3 |
| 1 | 300k | Resistor_SMD:R_0402_1005Metric | R7 |
| 1 | 43k | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_2x01_P2.54mm_Vertical_SMD | SWDIO/SWCLK |
| 1 | Conn_01x08 | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical_SMD | J2 |
| 1 | LP5912-3.3DRV | Package_SON:WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm_ThermalVias | U2 |
| 1 | NMOS | Package_TO_SOT_SMD:TSOT-23 | Q1 |
| 1 | STM32F042F6Px | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1 |
| 1 | TPS25200DRVR | SamacSys_Parts:SON65P200X200X80-7N | IC1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U3 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
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Questions
How big is the Mcu board backup20260115 PCB?
It measures 46.9 × 34.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Mcu board backup20260115 use?
34 parts, built around the LP5912-3.3DRVR, TPS25200DRVR and USBLC6-2SC6. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Mcu board backup20260115 KiCad files?
From the fstp/mcu_board repository on GitHub, at the commit this page was made from: the board is mcu_board_backup20260115.kicad_pcb and its schematic mcu_board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Mcu board backup20260115 design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).