4 layers60 × 28 mm
2 layers18 × 36 mm
Mu probe
UtkarshVerma/mu-probe3My personal take on the Black Magic Debug v2.1.
- Size
- 18 × 36 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 62
- Nets
- 68
- Pads
- 248
- Tracks, vias
- 703, 88
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 30 Apr 2025
- Updated
- 7 Sep 2025
Overview
Mu probe is an open-source printed circuit board by UtkarshVerma, from the UtkarshVerma/mu-probe repository on GitHub. It is a 2-layer board of 18 × 36 mm with 62 parts on 68 nets, routed with 703 tracks and 88 vias.
It is built around the 74LVC2T45DC, SPX3819M5-L-3-3 and USBLC6-2SC6. Its parts include 22 resistors, 21 capacitors, 7 ICs, 4 diodes and 4 connectors. It belongs with the sensors and measurement and interfaces and adapters boards and the STM32 boards of this library.
Main components
3
74LVC2T45DC
VSSOP-8-0.5mm-40℃~+125℃ 1 1.2V~5.5V 1.2V~5.5V 2 420Mbps Bidirectional Power-Off Protection Tri-State VSSOP-8-0.5mm Translators, Level Shifters ROHSNexperiaTranslators, Level Shifters
SPX3819M5-L-3-3
SOT-23-5-40℃~+85℃@(Ta) 1 20V 3.3V 420mV@(100mA) 500mA 5uA 70dB@(1kHz) Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
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.mdμProbe
This probe is my personal take on the Black Magic Debug project's Black Magic Probe v2.1. I was disappointed to find out that I could not use my STLink v3 on non-ST targets1, even when they used the same protocol. One thing led to another and I stumbled upon the Black Magic Probe. The idea of having a configurable debugger appealed to me. This combined with an itch to work on a hardware project is what brought μProbe into existence.
[!note] Please buy the official Black Magic Probe if you can! It is necessary to support the awesome work that the folks at the Black Magic project do.
Possible future improvements
- Improve nASSERT_TVREF circuitry.
- Switch to a more powerful MCU.
- Add USB-C power negotiation.
- Add AUX connector from BMP v2.3.
Credits
This project would not have been possible without the following resources:
Lastly, I would also like to thank the warm community at 1BitSquared's Discord server for their insights and help.
Footnotes
Parts
62| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | 100n | Capacitor_SMD:C_0402_1005Metric | C1, C2, C6, C7, C8, C9, C10, C11, C12, C13, C16, C17, C18, C19 |
| 8 | 100 | Resistor_SMD:R_0402_1005Metric | R12, R13, R14, R15, R16, R17, R18, R19 |
| 5 | 10k | Resistor_SMD:R_0402_1005Metric | R2, R3, R6, R7, R21 |
| 4 | 330 | Resistor_SMD:R_0402_1005Metric | R8, R9, R10, R11 |
| 4 | 74LVC2T45DC | Package_SO:VSSOP-8_2.3x2mm_P0.5mm | U3, U4, U5, U6 |
| 3 | 4.7u | Capacitor_SMD:C_0402_1005Metric | C3, C5, C15 |
| 2 | 12p | Capacitor_SMD:C_0402_1005Metric | C20, C21 |
| 2 | 4.7k | Resistor_SMD:R_0402_1005Metric | R1, R20 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R4, R5 |
| 1 | 1.5k | Resistor_SMD:R_0402_1005Metric | R22 |
| 1 | 10n | Capacitor_SMD:C_0402_1005Metric | C4 |
| 1 | 1u | Capacitor_SMD:C_0402_1005Metric | C14 |
| 1 | 8 MHz | footprints:Crystal_4P_GND24 | Y1 |
| 1 | Conn_ST_STDC14 | footprints:SAMTEC_FTSH-107-01-L-DV-K | J2 |
| 1 | DEBUG | Connector_PinHeader_1.27mm:PinHeader_1x05_P1.27mm_Vertical | J3 |
| 1 | DFU | Button_Switch_SMD:SW_Push_SPST_NO_Alps_SKRK | SW1 |
| 1 | DMG1023UV-7 | footprints:SOTFL50P162X60-6N | Q1 |
| 1 | DMG1024UV-7 | footprints:SOTFL50P162X60-6N | Q2 |
| 1 | GREEN | LED_SMD:LED_0402_1005Metric | D1 |
| 1 | ORANGE | LED_SMD:LED_0402_1005Metric | D2 |
| 1 | RED | LED_SMD:LED_0402_1005Metric | D3 |
| 1 | SPX3819M5-L-3-3 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | STM32F103CBTx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U7 |
| 1 | UART | Connector_PinHeader_1.27mm:PinHeader_1x04_P1.27mm_Vertical | J4 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U1 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
| 1 | YELLOW | LED_SMD:LED_0402_1005Metric | D4 |
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Questions
How big is the Mu probe PCB?
It measures 18 × 36 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Mu probe use?
62 parts, built around the 74LVC2T45DC, SPX3819M5-L-3-3 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 Mu probe KiCad files?
From the UtkarshVerma/mu-probe repository on GitHub, at the commit this page was made from: the board is main.kicad_pcb and its schematic main.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Mu probe design in my own project?
Its repository states no licence, so its author keeps all rights: ask UtkarshVerma before reusing the design.