CH343G

Q: Is there a KiCad symbol and footprint for the CH343G?

Yes. The symbol is Interface_USB:CH343G and the footprint Package_SO:SOIC-16_3.9x9.9mm_P1.27mm, both drawn on this page. PCBKit places them on a board for you when you design with it.

Q: What package is the CH343G?

SOP-16, with 16 pins. Its footprint is drawn on this page.

Q: Where is the CH343G datasheet?

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

Q: Where can I order the CH343G?

JLCPCB lists it as part C2844153, with 1,051 in stock; the sellers' links on this page open their listings.

Q: What can replace the CH343G?

Parts like it in the library: the CH340C by WCH (Nanjing Qinheng Microelectronics), the CH340G by WCH (Nanjing Qinheng Microelectronics), the SL2.1A by CoreChips and the CH340B by WCH (Nanjing Qinheng Microelectronics). Check their datasheets: a part that fits the footprint may still differ in its ratings.

Q: Which open-source boards use the CH343G?

10 boards in 9 repositories on GitHub; the most starred are listed on this page, with their KiCad files.

WCH (Nanjing Qinheng Microelectronics)

-40℃~+85℃ 15mA 160uA 3.3V、5V 6Mbps USB 2.0 USB to UART SOP-16 USB Converters ROHS

Extended

Datasheetwch/CH343G

Category: USB Converters
Package: SOP-16
Pins: 16

Overview

The CH343G is a USB Converter made by WCH (Nanjing Qinheng Microelectronics) in a SOP-16 package with 16 pins. -40℃~+85℃ 15mA 160uA 3.3V、5V 6Mbps USB 2.0 USB to UART SOP-16 USB Converters ROHS.

PCBKit's library has its KiCad symbol (Interface_USB:CH343G, from KiCad's library) and its footprint (Package_SO:SOIC-16_3.9x9.9mm_P1.27mm, from KiCad's library), ready for a KiCad board. 1,051 are in stock at JLCPCB (part C2844153). 10 open-source boards in 9 repositories on GitHub use it.

Symbol

Interface_USB:CH343GFrom KiCad's library

Footprint

Package_SO:SOIC-16_3.9x9.9mm_P1.27mmFrom KiCad's library

From the datasheet

Supply, least: 4 V · VDD5, recommended operating min, V3 decoupled · p. 5
Supply, most: 5.5 V · VDD5, recommended operating max, V3 decoupled · p. 5
Supply, least: 3 V · VDD5, recommended operating min, VDD5 connected to V3 · p. 5
Supply, most: 3.6 V · VDD5, recommended operating max, VDD5 connected to V3 · p. 5
Supply, least: 1.7 V · VIO, recommended operating min · p. 5
Supply, absolute maximum: 6 V · VDD5, absolute max · p. 5
Works from: -40 °C · Operating ambient min · p. 5
Works up to: 85 °C · Operating ambient max · p. 5
Takes working: 3 mA · sum of VDD5 or V3 and VIO typical operating currents, dependent on I/O load · p. 5
Takes asleep: 92 µA · sum of VDD5 and VIO typical USB suspend currents, VDD5=5V, no I/O load/pull-up · p. 5
Takes asleep: 87 µA · sum of VDD5/V3 and VIO typical USB suspend currents, VDD5=V3=3.3V, no I/O load/pull-up · p. 5
Data rate, most: 6 Mbit/s · UART maximum baud rate · p. 1

What it is and has

USB: Full-speed device interface, USB V2.0 compatible · p. 1
UART: Full duplex, independent transmit and receive buffers, 50 bps to 6 Mbps · p. 1
UART framing: 5, 6, 7 or 8 data bits; odd, even, space, mark or no parity · p. 1
MODEM signals: RTS, DTR, DCD, RI, DSR, CTS · p. 1
Hardware flow control: Automatic CTS and RTS · p. 1
Half duplex: TNOW transmit indication supports RS485 switching · p. 1
Driver support: Operating system CDC driver or vendor VCP driver · p. 1
I/O supply: Independent 5 V, 3.3 V, 2.5 V or 1.8 V supply with reverse-current protection · p. 1
Clock and reset: Internal clock and power-on reset; no external crystal required · p. 1
Unique ID: USB Serial Number · p. 1
Package: SOP16, 3.9 mm body width, 1.27 mm pitch · p. 2
Compliance: Lead-free, RoHS compatible · p. 1

Around it

cap 0.1uF: between V3 and GND; C7, internal 3.3 V node decoupling; place close to its pin. · p. 6
res 4.7KΩ（3～8KΩ）: between DTR and GND; Optional pull-down detected at power-up/reset to select half-duplex mode and TNOW output. · p. 4
other 5.5V: between VBUS and GND; Suggested overvoltage protection device. · p. 6

Specifications

Parameter	Conditions	As printed	Page
工作时的环境温度 TA		min -40 · max 85 ℃	5
储存时的环境温度 TS		min -55 · max 125 ℃	5
USB 端电源电压 VDD5	VDD5 引脚供电，GND 引脚接地	min -0.5 · max 6 V	5
串口 I/O 电源电压 VIO	VIO 引脚供电，GND 引脚接地	min -0.5 · max 6 V	5
VBUS 引脚上的电压 VVBUS		min -0.5 · max 6.5 V	5
USB 信号引脚上的电压 VUSB	最大值 V3+0.5 V	min -0.5 V	5
串口及其它引脚上的电压 VUART	最大值 VIO+0.5 V	min -0.5 V	5
USB 端电源电压 VDD5	V3 引脚不连 VDD5，V3 接电容	min 4 · typ 5 · max 5.5 V	5
USB 端电源电压 VDD5	V3 引脚连接 VDD5，VDD5=V3	min 3 · typ 3.3 · max 3.6 V	5
串口及其它 I/O 的 VIO 电源电压 VIO		min 1.7 · typ 5 · max 5.5 V	5
工作时 VDD5 或 V3 电源电流 IVDD		typ 3 · max 15 mA	5
工作时的 VIO 电源电流 IVIO	取决于 I/O 负载；最大值括注（10）	typ 0 · max 10 mA	5
USB 挂起时的电源电流 ISLP	VDD5 供电端=5V	typ 0.09 · max 0.16 mA	5
USB 挂起时的电源电流 ISLP	VDD5=V3 供电端=3.3V	typ 0.085 · max 0.15 mA	5
USB 挂起时的电源电流 ISLP	VIO 供电端，无 I/O 负载/上拉	typ 0.002 · max 0.05 mA	5
内部电源调节器对外负载能力 ILDO		max 10 mA	5
低电平输入电压 VIL	VIO=5V	min 0 · max 1.5 V	5
低电平输入电压 VIL	VIO=3.3V	min 0 · max 0.9 V	5
低电平输入电压 VIL	VIO=1.8V	min 0 · max 0.5 V	5
高电平输入电压 VIH	VIO=5V；最大值 VIO	min 2.5 V	5
高电平输入电压 VIH	VIO=3.3V；最大值 VIO	min 1.9 V	5
高电平输入电压 VIH	VIO=1.8V；最大值 VIO	min 1.3 V	5
VBUS 引脚高电平电压 VIHVBS	VIO=1.8V～5V	min 1.7 · max 5.8 V	5
低电平输出电压 VOL	VIO=5V，吸入 15mA 电流	typ 0.4 · max 0.5 V	5
低电平输出电压 VOL	VIO=3.3V，吸入 8mA 电流	typ 0.3 · max 0.4 V	5
低电平输出电压 VOL	VIO=1.8V，吸入 3mA 电流	typ 0.3 · max 0.4 V	5
串口和 RST 引脚的上拉电流（上拉到 VIO 电压） IPUP	VIO=5V	min 35 · typ 150 · max 220 uA	6
串口和 RST 引脚的上拉电流（上拉到 VIO 电压） IPUP	VIO=3.3V	min 15 · typ 60 · max 90 uA	6
串口和 RST 引脚的上拉电流（上拉到 VIO 电压） IPUP	VIO=1.8V	min 3 · typ 14 · max 21 uA	6
VBUS 引脚的下拉电流 IPDN	VBUS>1.6V	min 6 · typ 10 · max 16 uA	6
VBUS 引脚的下拉电流 IPDN	VBUS<1.3V	min 50 · typ 140 · max 200 uA	6
V3 电源上电复位/低压复位的电压门限 VRV3		min 2.5 · typ 2.7 · max 2.9 V	6
VIO 电源低压复位的电压门限 VRVIO		min 0.8 · typ 1 · max 1.15 V	6
USB 或 I/O 引脚上的 HBM ESD 耐压 VESD		min 5 · typ 6 KV	6
内部时钟的误差（同比影响波特率） FD	TA=-15℃～60℃；典型值 ±0.5%	min -1 · max 1 %	6
内部时钟的误差（同比影响波特率） FD	TA=-40℃～85℃；典型值 ±0.8%	min -1.6 · max 1.6 %	6
电源上电或外部复位输入后的复位延时 TRSTD		min 9 · typ 15 · max 25 mS	6
检测 USB 自动挂起时间 TSUSP		min 3 · typ 5 · max 9 mS	6
芯片睡眠后唤醒完成时间 TWAKE		min 1.2 · typ 1.5 · max 5 uS	6

Pins, by the datasheet

1 GND: Common ground; connect to USB bus ground. · p. 2
2 TXD: UART serial data output; high when idle. · p. 2
3 RXD: UART serial data input with internal pull-up. · p. 2
4 V3: Internal regulator output and core/USB supply input; connect to VDD5 below 3.6 V or decouple above 3.6 V. · p. 2
5 UD+: Connect directly to USB D+ without a series resistor. · p. 2
6 UD-: Connect directly to USB D- without a series resistor. · p. 2
7 VBUS: USB VBUS presence detection input with internal pull-down. · p. 2
8 ACT#: Active-low USB configuration complete indication; inactive during suspend. · p. 2
9 DCD: Active-low MODEM carrier detect input. · p. 2
11 RTS: Active-low MODEM request to send output. · p. 2
12 DSR: Active-low MODEM data set ready input. · p. 2
13 CTS: Active-low MODEM clear to send input. · p. 2
14 RI: Active-low MODEM ring indication input. · p. 2
15 VIO: I/O port supply input; requires external decoupling. · p. 2
16 VDD5: Positive supply input for the regulator; requires external decoupling. · p. 2

Ordering codes, by the datasheet

CH343G: SOP16 · 16-pin surface-mount package, 3.9 mm body width, 1.27 mm pitch · p. 2

Parameters

Applications Function: USB to UART
Current - Supply: 3mA
Data Rate: 6Mbps
Features: Programmable baud rate；Wake-up function；Built-in clock generator；Hardware flow control support；Low-power mode；Power-on reset
Operating Temperature: -40℃~+85℃
Quiescent Supply Current: 160uA
Standby Current: 92uA
USB Protocol: USB 2.0
Voltage - Supply: 1.7V~5.5V
Voltage - Supply(Absolute Max): 6V

Order codes

CH343GLCSC C2844153

Pinout

The pins of the CH343G
Pin	Name	Type
1	GND	Power in
2	TXD	Output
3	RXD	Input
4	V3	Power out
5	UD+	Input/output
6	UD-	Input/output
7	VBUS	Input
8	ACT	Output
9	DCD	Input
10	DTR	Output
11	RTS	Output
12	DSR	Input
13	CTS	Input
14	RI	Input
15	VIO	Power in
16	VDD5	Power in

Open-source boards using it

All 10

2 layers50 × 50 mm
Bobbycar lora can ethernet
bobbycar-graz/Telemetry-PCB
PCB with ESP32, CANbus, microSD, GPS and LoRa
53 parts7
2 layers111 × 113.8 mm
Obs studio controller
CommanderRedYT/obs-studio-controller
DIY hardware + software to control obs studio
64 parts2GPL-3.0
2 layers341.8 × 158.5 mm
Ws2812-clock
CommanderRedYT/ws2812-clock
A simple pcb clock using ws2812 in 7-segment form
533 parts2GPL-3.0
2 layers172.5 × 392 mm
Esp32 midi
0xFEEDC0DE64/esp-midi-board
ESP32 usb midi controller
444 parts1
2 layers52 × 75 mm
Boardcomputer reinvented
bobbycar-reinvented/bobbycar-boardcomputer-reinvented
The boardcomputer reinvented!
141 parts1GPL-3.0
2 layers40 × 90 mm
Bobbycar emergency hardware
bobbycar-reinvented/bobbycar-emergency-hardware
A pcb designed to control the bobbycar in worst case scenario (dead boardcomputer)
43 parts1GPL-3.0
2 layers17.4 × 29.4 mm
Bobby flasher
bobbycar-graz/bobby-flasher

30 parts
2 layers341.1 × 164.7 mm
Esp32-wroom board
alexandrebobkov/KiCAD-Projects
KiCAD PBC projects
62 parts2MIT

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Questions

Is there a KiCad symbol and footprint for the CH343G?

Yes. The symbol is Interface_USB:CH343G and the footprint Package_SO:SOIC-16_3.9x9.9mm_P1.27mm, both drawn on this page. PCBKit places them on a board for you when you design with it.

What package is the CH343G?

SOP-16, with 16 pins. Its footprint is drawn on this page.

Where is the CH343G datasheet?

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

Where can I order the CH343G?

JLCPCB lists it as part C2844153, with 1,051 in stock; the sellers' links on this page open their listings.

What can replace the CH343G?

Parts like it in the library: the CH340C by WCH (Nanjing Qinheng Microelectronics), the CH340G by WCH (Nanjing Qinheng Microelectronics), the SL2.1A by CoreChips and the CH340B 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 CH343G?

10 boards in 9 repositories on GitHub; the most starred are listed on this page, with their KiCad files.

CH343G

Overview

Symbol

Footprint

From the datasheet

What it is and has

Around it

Specifications

Pins, by the datasheet

Ordering codes, by the datasheet

Parameters

Order codes

Pinout

Open-source boards using it

Bobbycar lora can ethernet

Obs studio controller

Ws2812-clock

Esp32 midi

Boardcomputer reinvented

Bobbycar emergency hardware

Bobby flasher

Esp32-wroom board

Show this part on your page

Questions

Is there a KiCad symbol and footprint for the CH343G?

What package is the CH343G?

Where is the CH343G datasheet?

Where can I order the CH343G?

What can replace the CH343G?

Which open-source boards use the CH343G?

Parts like it

CH340C

CH340G

SL2.1A

CH340B

CH9329

CH9343G

CY7C63310-SXC

CY7C63801-SXC