ChipScout

Communication

CH343P

Newer WCH USB-to-UART bridge used in compact modern development boards.

China-madeWCHActiveModerate

Best For

Projects needing USB UART and Low cost with a commonly available communication part.

Avoid If

You need production-grade certainty without checking the exact module vendor, pinout, and library maintenance status.

Quick Decision Notes

CH343P is indexed as a communication part from WCH. ChipScout tracks it by practical maker-facing dimensions: interfaces, library readiness, estimated price, field-level sources, and whether the page is strong enough for selection rather than only lookup.

Technical Specifications

FunctionUSB to UARTSource: WCH
InterfaceUSB / UARTSource: WCH
USBFull speedSource: WCH
Working Voltage3.3V - 5VSource: WCH

Common Use Cases

  • Maker prototypes
  • Low-cost modules
  • Educational hardware

Known Issues

  • Breakout boards may use different pin labels or regulator choices
  • Clone modules can differ from the original datasheet part

Interfaces and Library Support

Interfaces
USBUART
Wireless
None
Voltage
3.3V
Libraries
Arduino pendingMicroPython pending
Data Integrity78% confidence
Sourcehttps://www.wch-ic.com/
Last verified2026-05-20
Core specsVerified
PinoutAvailable
Library supportNeeds verification
Price rangePresent
Found a wrong spec?

Every field is meant to be source-backed. Corrections should include a datasheet URL, vendor page, module photo, or reproducible library test.

Submit correction

Source Resources

Datasheethttps://www.wch-ic.com/WCH

Pinout Table

VCC3.3VPower the module from a rail that matches the breakout board, not just the bare IC.
GNDCommon groundConnect ground between the controller, sensor/module, and external power supply.
TXMCU RXCross TX to RX between the module and controller.
RXMCU TXCheck whether the module is 3.3V logic before connecting to 5V boards.

Pinout is not yet source-verified. Use the table as an integration checklist, then confirm exact pins against the module vendor page before wiring hardware.

Common Wiring

VCC

Power the module from a rail that matches the breakout board, not just the bare IC.

GND

Connect ground between the controller, sensor/module, and external power supply.

TX

Cross TX to RX between the module and controller.

RX

Check whether the module is 3.3V logic before connecting to 5V boards.

Arduino Example

Arduino support is not verified for this record yet. Add a library resource in the admin panel once a maintained driver or vendor SDK example is confirmed.

MicroPython Example

MicroPython support is pending. Treat community scripts as prototypes until a maintained driver is linked and tested on a known development board.

Recommended Development Boards

ESP32-C3 development board

Low-cost Wi-Fi/BLE board with enough interfaces for most sensors and modules.

Arduino Uno R4 / compatible

Good baseline for beginner wiring and library validation.

Raspberry Pi Pico W

Practical MicroPython target for I2C, SPI, UART, PWM, and ADC experiments.

Alternative Model Reasons

A7670CCommunicationChoose this when Arduino library maturity matters more than exact silicon match.
ATGM336HCommunicationChoose this when Arduino library maturity matters more than exact silicon match.
BC26CommunicationChoose this when Arduino library maturity matters more than exact silicon match.
CC1101CommunicationChoose this when Arduino library maturity matters more than exact silicon match.

Common Questions

What is CH343P best used for?

Projects needing USB UART and Low cost with a commonly available communication part.

Does CH343P support Arduino or MicroPython?

CH343P has Arduino support pending verification and MicroPython support pending verification.

What interfaces does CH343P use?

CH343P lists USB, UART; wireless support is no wireless protocol.

Compare CH343P vs A7670C

Alternatives and Related Parts

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BC26

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CC1101

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