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CH344Q

WCH (Nanjing Qinheng Microelectronics)Extended

-40℃~+85℃ 3.3V 4 6Mbps USB to UART、USB to RS232、USB to RS422、USB to RS485 LQFP-48(7x7) USB Converters ROHS

DatasheetJLCPCBLCSC
Part id
wch/CH344Q
Category
USB Converters
Package
LQFP-48(7x7)
Pins
48
In stock
2,037 at JLCPCB (C2988084)
Used on
2 open-source boards

Overview

The CH344Q is a USB Converter made by WCH (Nanjing Qinheng Microelectronics) in a LQFP-48(7x7) package with 48 pins. -40℃~+85℃ 3.3V 4 6Mbps USB to UART、USB to RS232、USB to RS422、USB to RS485 LQFP-48(7x7) USB Converters ROHS.

PCBKit's library has its KiCad symbol (Interface_USB:CH344Q, from KiCad's library) and its footprint (Package_QFP:LQFP-48_7x7mm_P0.5mm, from KiCad's library), ready for a KiCad board. 2,037 are in stock at JLCPCB (part C2988084). 2 open-source boards in 2 repositories on GitHub use it.

Symbol

DTR2/TNOW2/GPIO919DSR22RI23DCD24XI5XO6RESET7GND8VCC9CTS1/GPIO210RTS1/GPIO311TXD112RXD113ACT/CFG/DCD314TX_S/RI315RX_S/DSR316DSR117DTR1/TNOW1/GPIO918TXD221RXD222VCC24RI125CTS2/GPIO426RTS2/GPIO527DCD1/GPIO1528DSR0/GPIO1429TXD030RXD031RI0/GPIO1332DCD0/GPIO1233DTR3/TNOW3/GPIO1134VCC36TXD337RXD338DTR0/TNOW0/GPIO839RTS0/GPIO140CTS0/GPIO041UD-42UD+43TEST44RTS3/GPIO745CTS3/GPIO646VCC48
Interface_USB:CH344QFrom KiCad's library

Footprint

Package_QFP:LQFP-48_7x7mm_P0.5mmFrom KiCad's library

Pinout

48
The pins of the CH344Q
PinNameType
1NCNot connected
2DSR2Input
3RI2Input
4DCD2Input
5XIInput
6XOOutput
7RESETInput
8GNDPower in
9VCCPower in
10CTS1/GPIO2Input/output
11RTS1/GPIO3Input/output
12TXD1Output
13RXD1Input
14ACT/CFG/DCD3Input/output
15TX_S/RI3Input/output
16RX_S/DSR3Input/output
17DSR1Input
18DTR1/TNOW1/GPIO9Input/output
19DTR2/TNOW2/GPIO9Input/output
20GNDPassive
21TXD2Output
22RXD2Input
23GNDPassive
24VCCPower in
25RI1Input
26CTS2/GPIO4Input/output
27RTS2/GPIO5Input/output
28DCD1/GPIO15Input/output
29DSR0/GPIO14Input
30TXD0Output
31RXD0Input
32RI0/GPIO13Input/output
33DCD0/GPIO12Input/output
34DTR3/TNOW3/GPIO11Input/output
35GNDPassive
36VCCPower in
37TXD3Output
38RXD3Input
39DTR0/TNOW0/GPIO8Input/output
40RTS0/GPIO1Input/output
41CTS0/GPIO0Input/output
42UD-Input/output
43UD+Input/output
44TESTInput
45RTS3/GPIO7Input/output
46CTS3/GPIO6Input/output
47GNDPassive
48VCCPower in

Open-source boards using it

2
  • 2 layers89 × 99 mmIsouart4, the printed circuit board in 3D

    Isouart4

    nedko/isouart4

    87 parts
  • 4 layers41.2 × 32.6 mmUsb2uart kicad, the printed circuit board in 3D

    Usb2uart kicad

    samvangysegem/usb2uart-hardware

    CH344-based USB-to-UART converter

    49 parts

Parts like it

8

Questions

Is there a KiCad symbol and footprint for the CH344Q?

Yes. The symbol is Interface_USB:CH344Q and the footprint Package_QFP:LQFP-48_7x7mm_P0.5mm, both drawn on this page. PCBKit places them on a board for you when you design with it.

What package is the CH344Q?

LQFP-48(7x7), with 48 pins. Its footprint is drawn on this page.

Where is the CH344Q datasheet?

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

Where can I order the CH344Q?

JLCPCB lists it as part C2988084, with 2,037 in stock; the sellers' links on this page open their listings.

What can replace the CH344Q?

Parts like it in the library: the XR21V1414IM48TR-F by MaxLinear, the FT232HL-REEL by FTDI, the FE2.1 by TERMINUS and the FE1.1 by TERMINUS. Check their datasheets: a part that fits the footprint may still differ in its ratings.

Which open-source boards use the CH344Q?

2 boards in 2 repositories on GitHub; the most starred are listed on this page, with their KiCad files.