2 layers27.5 × 69 mm
CH341A Pro
Upcycle-Electronics/CH341A-Pro
Retrace pics and schematic for the Cheap Black CH341A Serial Flash EEPROM BIOS Programmer
18 parts81
2 layers28 × 42 mm
CH341 Breakout
ADBeta/CH341A_USB_CUSB-C CH341A Breakout Board with EEPROM, I2C, SPI and UART Outputs - with headers for SOIC Clips
- Size
- 28 × 42 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 35
- Pads
- 100
- Tracks, vias
- 146, 47
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 22 Apr 2025
- Updated
- 9 May 2025
Overview
CH341 Breakout is an open-source printed circuit board by ADBeta, from the ADBeta/CH341A_USB_C repository on GitHub, published under the MIT licence. It is a 2-layer board of 28 × 42 mm with 18 parts on 35 nets, routed with 146 tracks and 47 vias.
It is built around the CH341A and AMS1117-3.3. Its parts include 5 connectors, 4 resistors, 3 capacitors, 2 ICs and 2 diodes. It belongs with the interfaces and adapters boards of this library.
Main components
2
CH341A
SOP-28-300mil120uA 12mA 2Mbps 3.3V、5V USB 2.0 USB to UART、USB to SPI、USB to I2C、USB to printer、USB to parallel port SOP-28-300mil USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
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.mdCH341a USB-C Breakout Board with UART and Programmer Pinouts
Description
A Breakout Board for the CH341a USB UART, I2C and SPI Device, used for
programming SPI Flash Storage or I2C EEPROM, but with USB-C Connector
rather than the USB-A Male of the generic Black Edition Board.
Parts List
D1 0603 Red LED
D2 0603 Red LED
R1 0603 2K2
R2 0603 2K2
R3 0603 2K2
R4 0603 2K2
C1 0603 20pF
C2 0603 20pF
C3 0603 100nF
U1 CH341a
U2 AMS1117-3.3
Y1 HC49S 12MHz XTALCopyright (c) ADBeta 2025
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 2K2 | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4 |
| 2 | 20pF | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 12MHz | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | ACT | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | CH341A | Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm | U1 |
| 1 | CONN_I2C_EEPROM | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical | J12 |
| 1 | CONN_MODE | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J02 |
| 1 | CONN_SPI_FLASH | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical | J13 |
| 1 | CONN_UART | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J11 |
| 1 | PWR | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | RST | Button_Switch_SMD:SW_SPST_SKQG_WithoutStem | SW1 |
| 1 | USB_C | Connector_USB:USB_C_Receptacle_G-Switch_GT-USB-7010ASV | J01 |
Questions
How big is the CH341 Breakout PCB?
It measures 28 × 42 mm and has 2 copper layers, 1.6 mm thick.
What parts does the CH341 Breakout use?
18 parts, built around the CH341A 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 CH341 Breakout KiCad files?
From the ADBeta/CH341A_USB_C repository on GitHub, at the commit this page was made from: the board is CH341_Breakout.kicad_pcb and its schematic CH341_Breakout.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the CH341 Breakout 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).
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