2 layers14 × 15 mm
2 layers43.5 × 30 mm
StmDevBoard
B-Leadr/STM32L4KC-Development-BoardA custom made mini development board for the STM32L432KC6 low power MCU.
- Size
- 43.5 × 30 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 38
- Pads
- 112
- Tracks, vias
- 256, 31
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 19 Jun 2026
- Updated
- 30 Jun 2026
Overview
StmDevBoard is an open-source printed circuit board by B-Leadr, from the B-Leadr/STM32L4KC-Development-Board repository on GitHub. It is a 2-layer board of 43.5 × 30 mm with 23 parts on 38 nets, routed with 256 tracks and 31 vias.
It is built around the STM32L432KCU6, AMS1117-3.3 and ABS07-32.768KHZ-T, with the OS102011MS2QN1 and USB4135-GF-A among its other parts. Its parts include 8 capacitors, 5 resistors, 4 connectors, 2 ICs and 2 switches. It belongs with the STM32 boards of this library.
Main components
5
STM32L432KCU6
UFQFPN-32(5x5)-40℃~+85℃ 1.71V~3.6V 12bit 12bit 256KB 26 32 Bit 64KB 80MHz ARM Cortex-M4 Built-in FLASH UFQFPN-32(5x5) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
ABS07-32.768KHZ-T
SMD3215-2P-40℃~+85℃ 12.5pF 32.768kHz 70kΩ Crystal Oscillator ±20ppm SMD3215-2P Crystals ROHSAbraconCrystals
OS102011MS2QN1
插件-30℃~+70℃ 10000 times 100mA 12V 8mm PC Pin Rectangular Columnar SPDT Through Hole 插件 Slide Switches ROHSC&KSlide Switches
USB4135-GF-A
SMD-30℃~+85℃ 1 3A 48V 6P Black Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSGlobal Connector Technology (GCT)USB Connectors
README
README.mdSTM32L4KC-Development-Board
A custom made mini development board for the STM32L432KC6 low power MCU.
Features
- STM32L432KCU6 MCU
- Serial Wire Programming Headers
- USB-C Power Connection
- 8mhz external crystal for precise timing
- Boot and reset switches
- Breakout of 21 GPIO pins
Schematic and Layout
A pdf of the schematic can be viewed here Schematic.pdf and kicad project files are included as well for your own alterations. I tried my best to keep all components on one side of the board and the footprint as small as possible, and in a form that can easily be inserted into a breadboard much like an arduino nano or stm nucleo with an L4 chip like this one.
BOM
A detailed bom with links to each compenent on digikey can be found in the production files
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 5.1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R4, R5, R6 |
| 3 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3 |
| 2 | 15pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C7, C8 |
| 2 | Conn_01x12_Pin | Connector_PinHeader_2.54mm:PinHeader_1x12_P2.54mm_Vertical | J3, J4 |
| 1 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | 10u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C5 |
| 1 | 22u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6 |
| 1 | 4.7u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4 |
| 1 | ABS07-32.768KHZ-T | Crystal:Crystal_SMD_Abracon_ABM7-2Pin_6.0x3.5mm | Y1 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U1 |
| 1 | LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2 |
| 1 | NRST | Button_Switch_THT:SW_PUSH_1P1T_6x3.5mm_H4.3_APEM_MJTP1243 | SW1 |
| 1 | OS102011MS2QN1 | Downloaded FootPrints:SW_OS102011MS2QN1 | SW2 |
| 1 | STLINK | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Horizontal | J2 |
| 1 | STM32L432KCU6 | Downloaded FootPrints:STM32L432KCU6 | U2 |
| 1 | USB4135-GF-A | Connector_USB:USB_C_Receptacle_GCT_USB4135-GF-A_6P_TopMnt_Horizontal | J1 |
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Questions
How big is the StmDevBoard PCB?
It measures 43.5 × 30 mm and has 2 copper layers, 1.6 mm thick.
What parts does the StmDevBoard use?
23 parts, built around the STM32L432KCU6, AMS1117-3.3, ABS07-32.768KHZ-T and OS102011MS2QN1. 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 StmDevBoard KiCad files?
From the B-Leadr/STM32L4KC-Development-Board repository on GitHub, at the commit this page was made from: the board is PCB/stmDevBoard.kicad_pcb and its schematic PCB/stmDevBoard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the StmDevBoard design in my own project?
Its repository states no licence, so its author keeps all rights: ask B-Leadr before reusing the design.