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CH341A

WCH (Nanjing Qinheng Microelectronics)Extended

120uA 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 ROHS

DatasheetJLCPCBLCSC
Part id
wch/CH341A
Category
USB Converters
Package
SOP-28-300mil
Pins
28
In stock
345 at JLCPCB (C13517)
Used on
12 open-source boards

Overview

The CH341A is a USB Converter made by WCH (Nanjing Qinheng Microelectronics) in a SOP-28-300mil package with 28 pins. 120uA 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 ROHS.

PCBKit's library has its KiCad symbol (Interface_USB:CH341A, from KiCad's library) and its footprint (Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm, from KiCad's library), ready for a KiCad board. 345 are in stock at JLCPCB (part C13517). 12 open-source boards in 10 repositories on GitHub use it.

Symbol

RTS/D621SLP/D722SDA23SCL24RDY/STB/WR25TNOW/INI/RST26TEN/BUSY/WT27VCC28ACT1RSTI2IN7/SIN/AS3ROV/AFD/DS4TXD/ERR5RXD/PEMP6INT/ACK7IN3/SLCT8V39UD+10UD-11GND12XI13XO14CTS/D015DSR/D116RI/D217DCD/D318OUT/D419DTR/D520
Interface_USB:CH341AFrom KiCad's library

Footprint

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Package_SO:SOIC-28W_7.5x17.9mm_P1.27mmFrom KiCad's library

Pinout

28
The pins of the CH341A
PinNameType
1ACTOutput
2RSTIPassive
3IN7/SIN/ASTri-state
4ROV/AFD/DSTri-state
5TXD/ERRInput/output
6RXD/PEMPInput
7INT/ACKPassive
8IN3/SLCTPassive
9V3Passive
10UD+Input/output
11UD-Input/output
12GNDPower in
13XIInput
14XOOutput
15CTS/D0Tri-state
16DSR/D1Tri-state
17RI/D2Tri-state
18DCD/D3Tri-state
19OUT/D4Tri-state
20DTR/D5Tri-state
21RTS/D6Tri-state
22SLP/D7Tri-state
23SDAInput/output
24SCLOpen collector
25RDY/STB/WROutput
26TNOW/INI/RSTOutput
27TEN/BUSY/WTPassive
28VCCPower in

Open-source boards using it

12See all 12
  • 2 layers27.5 × 69 mmCH341A Pro, the printed circuit board in 3D

    CH341A Pro

    Upcycle-Electronics/CH341A-Pro

    Retrace pics and schematic for the Cheap Black CH341A Serial Flash EEPROM BIOS Programmer

    18 parts81
  • 2 layersSpinV1DevBoard, the printed circuit board in 3D

    SpinV1DevBoard

    AliceAch/SPIN-FV1-Tone-Dev

    A PCB Tone Development board for Guitar Effects, built around the SPIN FV1 DSP IC.

    58 parts1
  • 2 layers27.5 × 69 mmFlashCore, the printed circuit board in 3D

    FlashCore

    Omarbelh/FlashCore

    Hybrid USB-C SPI Flash & EEPROM programmer based on CH341A and ESP32-S3.

    54 parts1MIT
  • 2 layers28 × 42 mmCH341 Breakout, the printed circuit board in 3D

    CH341 Breakout

    ADBeta/CH341A_USB_C

    USB-C CH341A Breakout Board with EEPROM, I2C, SPI and UART Outputs - with headers for SOIC Clips

    18 partsMIT
  • 2 layers254 × 134.1 mmS100 B1FU, the printed circuit board in 3D

    S100 B1FU

    CatspersCoffee/S100-Boards

    S-100 bus boards designed and built: Z80 and 80386 CPU cards, SRAM/DRAM memory, CPLD/FPGA I/O and SPI boards, an 18-slot backplane and bus terminator.

    164 parts
  • 2 layers254 × 134.1 mmS10 PIC SPI v1, the printed circuit board in 3D

    S10 PIC SPI v1

    CatspersCoffee/S100-Boards

    S-100 bus boards designed and built: Z80 and 80386 CPU cards, SRAM/DRAM memory, CPLD/FPGA I/O and SPI boards, an 18-slot backplane and bus terminator.

    163 parts
  • 2 layers38.9 × 69.6 mmSpi onboard prog, the printed circuit board in 3D

    Spi onboard prog

    fachat/pcb_bits

    Various libs for symbols, footprints, partial schematics

    32 parts

Parts like it

8

Questions

Is there a KiCad symbol and footprint for the CH341A?

Yes. The symbol is Interface_USB:CH341A and the footprint Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm, both drawn on this page. PCBKit places them on a board for you when you design with it.

What package is the CH341A?

SOP-28-300mil, with 28 pins. Its footprint is drawn on this page.

Where is the CH341A datasheet?

WCH (Nanjing Qinheng Microelectronics) publishes it: the Datasheet link on this page opens it.

Where can I order the CH341A?

JLCPCB lists it as part C13517, with 345 in stock; the sellers' links on this page open their listings.

What can replace the CH341A?

Parts like it in the library: the CH376S by WCH (Nanjing Qinheng Microelectronics), the CH375B by WCH (Nanjing Qinheng Microelectronics), the CH341B by WCH (Nanjing Qinheng Microelectronics) and the CH340S by WCH (Nanjing Qinheng Microelectronics). Check their datasheets: a part that fits the footprint may still differ in its ratings.

Which open-source boards use the CH341A?

12 boards in 10 repositories on GitHub; the most starred are listed on this page, with their KiCad files.