2 layers68 × 40 mm
Stm32-io extend
hardenedlinux/cheap-pcb
Cheap PCB: Better understanding the current status of hardware supply chain
44 parts170CC0-1.0
2 layers44 × 33 mm
STM32-USBb
diegomrno/STM32-USBb1Experimental PCB based on an STM32 microcontroller with USB type B
- Size
- 44 × 33 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 32
- Nets
- 50
- Pads
- 128
- Tracks, vias
- 210, 26
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 21 Feb 2026
- Updated
- 22 Feb 2026
Overview
STM32-USBb is an open-source printed circuit board by diegomrno, from the diegomrno/STM32-USBb repository on GitHub. It is a 2-layer board of 44 × 33 mm with 32 parts on 50 nets, routed with 210 tracks and 26 vias.
It is built around the STM32F103C8T6 and AMS1117-3.3. Its parts include 13 capacitors, 5 resistors, 4 connectors, 2 ICs and 1 diode. It belongs with the STM32 boards of this library.
Main components
2
STM32F103C8T6
LQFP-48(7x7)-40℃~+85℃ 12bit 20KB 2V~3.6V 32 Bit 37 64KB 72MHz ARM Cortex-M3 Built-in FLASH LQFP-48(7x7) 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
README
README.mdSTM32-USBb
STM32-USBb is an experimental PCB based on an STM32 microcontroller, designed for research and prototyping purposes.
This board is part of the Raptor project by Infinite.
[!IMPORTANT] This PCB is not production-ready.
It is purely experimental and intended only for early development and future work within the Infinite project.
Preview
PCB
Components list (ref & role)
-
U1 : STM32 (STM32F103C8T6) microcontroller (main MCU)
-
U2 : 3.3 V linear voltage regulator
-
Y3 : 16 MHz external crystal (MCU clock)
-
J1, J2, J3 : Pin headers (GPIO / debug / expansion)
-
J4 : USB Micro-B connector (power + USB data)
-
SW1 : Power / mode selection switch
-
D1 : Status LED
-
FB1 : Ferrite bead (power supply noise filtering)
-
R3 : USB pull-up resistor
-
R2 : MCU reset / configuration pull resistor
-
R1, R4, R5 : Current limiting / configuration resistors
-
C1, C2 : Bulk input/output decoupling capacitors
-
C3, C4, C5, C6, C11 : MCU decoupling capacitors
-
C7 : Local bulk decoupling capacitor
-
C8, C9, C10 : Power rail filtering capacitors
-
C12, C13 : Crystal load capacitors
Parts
32| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100n | Capacitor_SMD:C_0402_1005Metric | C3, C4, C5, C6, C11 |
| 4 | 1k5 | Resistor_SMD:R_0402_1005Metric | R1, R3, R4, R5 |
| 4 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 3 | Conn_01x04_Pin | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J1, J2, J3 |
| 2 | 10p | Capacitor_SMD:C_0402_1005Metric | C12, C13 |
| 2 | 1u | Capacitor_SMD:C_0402_1005Metric | C9, C10 |
| 2 | 22u | Capacitor_SMD:C_0805_2012Metric | C1, C2 |
| 1 | 10k | Resistor_SMD:R_0402_1005Metric | R2 |
| 1 | 10n | Capacitor_SMD:C_0402_1005Metric | C8 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric | C7 |
| 1 | 16MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y3 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | FerriteBead | Inductor_SMD:L_0603_1608Metric | FB1 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | STM32F103C8T6 | Package_QFP:LQFP-48_7x7mm_P0.5mm | U1 |
| 1 | SW_SPDT | Button_Switch_SMD:SW_SPDT_CK_JS102011SAQN | SW1 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Wuerth_629105150521 | J4 |
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Questions
How big is the STM32-USBb PCB?
It measures 44 × 33 mm and has 2 copper layers, 1.6 mm thick.
What parts does the STM32-USBb use?
32 parts, built around the STM32F103C8T6 and AMS1117-3.3. 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 STM32-USBb KiCad files?
From the diegomrno/STM32-USBb repository on GitHub, at the commit this page was made from: the board is STM32-USBb/STM32-USBb.kicad_pcb and its schematic STM32-USBb/STM32-USBb.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the STM32-USBb design in my own project?
Its repository states no licence, so its author keeps all rights: ask diegomrno before reusing the design.