CH343P

Q: Is there a KiCad symbol and footprint for the CH343P?

Yes. The symbol is Interface_USB:CH343P and the footprint Package_DFN_QFN:WCH_QFN-16-1EP_3x3mm_P0.5mm_EP1.8x1.8mm, both drawn on this page. PCBKit places them on a board for you when you design with it.

Q: What package is the CH343P?

TQFN-16-EP(3x3), with 17 pins. Its footprint is drawn on this page.

Q: Where is the CH343P datasheet?

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

Q: Where can I order the CH343P?

JLCPCB lists it as part C2846043, with 9,138 in stock; the sellers' links on this page open their listings.

Q: Which open-source boards use the CH343P?

55 boards in 49 repositories on GitHub; the most starred are listed on this page, with their KiCad files.

WCH (Nanjing Qinheng Microelectronics)

-40℃~+85℃ 3.3V、5V 3mA 6Mbps 90uA USB 2.0 USB to UART TQFN-16-EP(3x3) USB Converters ROHS

Extended

Datasheetwch/CH343P

Category: USB Converters
Package: TQFN-16-EP(3x3)
Pins: 17

Overview

The CH343P is a USB Converter made by WCH (Nanjing Qinheng Microelectronics) in a TQFN-16-EP(3x3) package with 17 pins. -40℃~+85℃ 3.3V、5V 3mA 6Mbps 90uA USB 2.0 USB to UART TQFN-16-EP(3x3) USB Converters ROHS.

PCBKit's library has its KiCad symbol (Interface_USB:CH343P, from KiCad's library) and its footprint (Package_DFN_QFN:WCH_QFN-16-1EP_3x3mm_P0.5mm_EP1.8x1.8mm, from KiCad's library), ready for a KiCad board. 9,138 are in stock at JLCPCB (part C2846043). 55 open-source boards in 49 repositories on GitHub use it.

Symbol

Interface_USB:CH343PFrom KiCad's library

Footprint

Package_DFN_QFN:WCH_QFN-16-1EP_3x3mm_P0.5mm_EP1.8x1.8mmFrom KiCad's library

From the datasheet

Supply, least: 4 V · VDD5, min with V3 decoupled and disconnected from VDD5 · p. 5
Supply, most: 5.5 V · VDD5, max with V3 decoupled and disconnected from VDD5 · p. 5
Supply, least: 3 V · VDD5, min with V3 connected to VDD5 · p. 5
Supply, most: 3.6 V · VDD5, max with V3 connected to VDD5 · p. 5
Supply, least: 1.7 V · VIO, min operating supply · p. 5
Supply, absolute maximum: 6 V · VDD5, absolute max · p. 5
Works from: -40 °C · min operating ambient temperature · p. 5
Works up to: 85 °C · max operating ambient temperature · p. 5
Takes working: 3 mA · sum of typical VDD5 or V3 current and typical VIO current, dependent on I/O load · p. 5
Takes asleep: 92 µA · sum of typical USB suspend VDD5 current at 5 V and VIO current without I/O load or pull-up · p. 5
Takes asleep: 87 µA · sum of typical USB suspend VDD5=V3 current at 3.3 V and VIO current without I/O load or pull-up · p. 5
Data rate, most: 6 Mbit/s · max UART 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–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: CTS and RTS · p. 1
RS485 support: Half duplex with TNOW transmission indication · p. 1
I/O supply: Independent 5 V, 3.3 V, 2.5 V or 1.8 V supply; reverse-current prevention · p. 1
Clock and reset: Internal clock and power-on reset; no external crystal required · p. 1
EEPROM: Configurable VID, PID, maximum current, manufacturer and product strings · p. 1
Unique ID: USB Serial Number · p. 1
Package: QFN16_3X3, 3*3mm, 0.5mm pitch · p. 2
USB drivers: Operating-system CDC driver or vendor VCP driver · p. 1

Around it

cap 0.1uF: between V3 and GND; Internal 3.3 V node decoupling; place close to the connected pin. · p. 6
cap not specified: between VDD5 and GND; External supply decoupling required; place close to the supply pin. · p. 2
cap not specified: between VIO and GND; External supply decoupling required; place close to the supply pin. · p. 2
res 4.7KΩ（3～8KΩ）: between DTR and GND; Optional pull-down sampled at power-up or reset to enable half-duplex mode and change DTR to TNOW. · p. 4
other 5.5V: between VBUS and GND; Recommended overvoltage protection; alternatively increase C8 to 10uF. · 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	TA=25℃，VIO=1.8V～5V；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	TA=25℃，VIO=1.8V～5V；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	TA=25℃，VDD5=5V 或 VDD5=V3=3.3V	min 1.7 · typ 5 · max 5.5 V	5
工作时 VDD5 或 V3 电源电流 IVDD	TA=25℃，VDD5=5V 或 VDD5=V3=3.3V，VIO=1.8V～5V，不含 USB 引脚	typ 3 · max 15 mA	5
工作时的 VIO 电源电流 IVIO	TA=25℃，VDD5=5V 或 VDD5=V3=3.3V，VIO=1.8V～5V，不含 USB 引脚；取决于 I/O 负载；最大值印为（10）	typ 0 · max 10 mA	5
USB 挂起时的电源电流 ISLP	TA=25℃；VDD5 供电端=5V	typ 0.09 · max 0.16 mA	5
USB 挂起时的电源电流 ISLP	TA=25℃；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	TA=25℃；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	TA=25℃，VDD5=5V 或 VDD5=V3=3.3V，VIO=1.8V～5V，不含 USB 引脚	max 10 mA	5
低电平输入电压 VIL	TA=25℃；VIO=5V	min 0 · max 1.5 V	5
低电平输入电压 VIL	TA=25℃；VIO=3.3V	min 0 · max 0.9 V	5
低电平输入电压 VIL	TA=25℃；VIO=1.8V	min 0 · max 0.5 V	5
高电平输入电压 VIH	TA=25℃；VIO=5V；最大值 VIO	min 2.5 V	5
高电平输入电压 VIH	TA=25℃；VIO=3.3V；最大值 VIO	min 1.9 V	5
高电平输入电压 VIH	TA=25℃；VIO=1.8V；最大值 VIO	min 1.3 V	5
VBUS 引脚高电平电压 VIHVBS	TA=25℃；VIO=1.8V～5V	min 1.7 · max 5.8 V	5
低电平输出电压 VOL	TA=25℃；VIO=5V，吸入 15mA 电流	typ 0.4 · max 0.5 V	5
低电平输出电压 VOL	TA=25℃；VIO=3.3V，吸入 8mA 电流	typ 0.3 · max 0.4 V	5
低电平输出电压 VOL	TA=25℃；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	TA=25℃；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	TA=25℃；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	TA=25℃；VIO=1.8V	min 3 · typ 14 · max 21 uA	6
VBUS 引脚的下拉电流 IPDN	TA=25℃；VBUS>1.6V	min 6 · typ 10 · max 16 uA	6
VBUS 引脚的下拉电流 IPDN	TA=25℃；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	TA=25℃，VDD5=5V 或 VDD5=V3=3.3V，VIO=1.8V～5V	min 2.5 · typ 2.7 · max 2.9 V	6
VIO 电源低压复位的电压门限 VRVIO	TA=25℃，VDD5=5V 或 VDD5=V3=3.3V，VIO=1.8V～5V	min 0.8 · typ 1 · max 1.15 V	6
USB 或 I/O 引脚上的 HBM ESD 耐压 VESD	TA=25℃	min 5 · typ 6 KV	6
内部时钟的误差（同比影响波特率） FD	VDD5=5V 或 VDD5=V3=3.3V，VIO=1.8V～5V；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	VDD5=5V 或 VDD5=V3=3.3V，VIO=1.8V～5V；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	TA=25℃，VDD5=5V 或 VDD5=V3=3.3V，VIO=1.8V～5V	min 9 · typ 15 · max 25 mS	6
检测 USB 自动挂起时间 TSUSP	TA=25℃，VDD5=5V 或 VDD5=V3=3.3V，VIO=1.8V～5V	min 3 · typ 5 · max 9 mS	6
芯片睡眠后唤醒完成时间 TWAKE	TA=25℃，VDD5=5V 或 VDD5=V3=3.3V，VIO=1.8V～5V	min 1.2 · typ 1.5 · max 5 uS	6

Pins, by the datasheet

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

Ordering codes, by the datasheet

CH343P: QFN16_3X3 · 3*3mm, 0.5mm pitch; internal configurable EEPROM · 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: 90uA
Standby Current: 92uA
USB Protocol: USB 2.0
Voltage - Supply: 1.7V~5.5V
Voltage - Supply(Absolute Max): 6V

Order codes

CH343PLCSC C2846043

Pinout

The pins of the CH343P
Pin	Name	Type
1	VIO	Power in
2	GND	Power in
3	VDD5	Power in
4	TXD	Output
5	RXD	Input
6	V3_{OUT}	Power out
7	UD+	Input/output
8	UD-	Input/output
9	VBUS	Input
10	ACT	Output
11	DCD	Input
12	DTR	Output
13	RTS	Output
14	DSR	Input
15	CTS	Input
16	RI	Input
17	GND_EPAD	Power in

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Questions

Is there a KiCad symbol and footprint for the CH343P?

Yes. The symbol is Interface_USB:CH343P and the footprint Package_DFN_QFN:WCH_QFN-16-1EP_3x3mm_P0.5mm_EP1.8x1.8mm, both drawn on this page. PCBKit places them on a board for you when you design with it.

What package is the CH343P?

TQFN-16-EP(3x3), with 17 pins. Its footprint is drawn on this page.

Where is the CH343P datasheet?

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

Where can I order the CH343P?

JLCPCB lists it as part C2846043, with 9,138 in stock; the sellers' links on this page open their listings.

Which open-source boards use the CH343P?

55 boards in 49 repositories on GitHub; the most starred are listed on this page, with their KiCad files.