CH343P The WCH CH343P is a USB to high-speed asynchronous serial port conversion chip. It provides common modem contact signals and is used to expand asynchronous serial ports for computers.
Mfr Part #:

CH343P

Available from 1 distributors
Mfr Name: WCH
WCH
The WCH CH343P is a USB to high-speed asynchronous serial port conversion chip. It provides common modem contact signals and is used to expand asynchronous serial ports for computers.
✓ Total Stock: 1,068 pcs
$ Price Range: $0.99

CH343P Available from 1 distributor

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✓ Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
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1,068 pcs
1068 pcs On Request 1 On Request On Request On Request On Request On Request

CH343P Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Lead Spacing
Lead Style
Mounting Type
SVHC Present

CH343P Description

Short technical summary and product information.

The WCH CH343P is a versatile USB to serial converter IC designed to bridge USB buses with high-speed asynchronous serial ports. It is fully compatible with USB V2.0 and emulates standard serial ports, making it ideal for upgrading existing serial peripheral devices or adding extra serial ports via USB. The chip ensures full compatibility with serial port applications on Windows operating systems without requiring modifications.

 

Key features include hardware full-duplex serial communication with independent transmit and receive buffers, supporting baud rates from 50bps up to 6Mbps. It offers flexible data bit configurations (5, 6, 7, or 8 bits) and supports various parity options including even, odd, blank, mark, and none. The CH343P also supports common modem contact signals such as RTS, DTR, DCD, RI, DSR, and CTS, with hardware automatic flow control for CTS and RTS.

 

This chip supports half-duplex communication and provides a transmit status indication (TNOW) for RS485 switching. It can support RS232 interfaces through external level conversion components. The CH343P operates with USB-side voltages of 5V or 3.3V and offers independent I/O power supply options from 1.8V to 5V, with anti-backflow protection. It integrates power-on reset and a clock, eliminating the need for an external crystal oscillator. Available in SOP16, ESSOP10, and QFN16 lead-free packages, it is RoHS compliant.

 

The CH343P is suitable for applications requiring reliable USB to serial communication, such as industrial control, embedded systems, and data acquisition where legacy serial devices need to interface with modern USB-equipped computers.

CH343P Quick Information

Product Type: USB to Serial Converter IC
Series: CH343
Canonical Name: WCH CH343P USB to High-Speed Serial Chip
Subcategory: UARTs

CH343P Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected
Lead Free: Yes

CH343P Estimated Pricing

Qty Low High
1+ $0.99 $0.99

Estimated market price range - modelled values for guidance only, not live distributor offers.

CH343P Features

  • USB 2.0 full-speed device interface.
  • Hardware full-duplex serial port.
  • Supports baud rates from 50bps to 6Mbps.
  • Supports common modem contact signals.
  • Available in SOP16, ESSOP10, and QFN16 packages.

CH343P Applications

  • Extends computer asynchronous serial ports.
  • Upgrades serial devices to USB.
  • Connects MCUs directly to USB.
  • Supports RS485 communication.
  • Facilitates RS232 interface conversion.

CH343P FAQs

7 frequently asked questions generated from this part’s specifications.
What is the USB protocol supported by the CH343P?

USB 2.0.

What baud rates does the CH343P support?

From 50bps to 6Mbps.

Does the CH343P support hardware flow control?

Yes, it supports CTS/RTS hardware flow control.

What interface voltages are supported on the UART side?

1.8V, 2.5V, 3.3V, and 5V.

What packages are available for the CH343P?

QFN16_3X3, SOP16, and ESSOP10.

Does the CH343P have an internal clock?

Yes, it has an internal clock source, eliminating the need for an external crystal.

Does the chip have a unique ID?

Yes, it has a built-in unique ID used as a USB serial number.

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