CH340X

WCH (Nanjing Qinheng Microelectronics)Extended

-20℃~+70℃ 2Mbps 3.3V、5V USB 2.0 USB to serial、USB to Parallel MSOP-10 USB Converters ROHS

Part id: wch/CH340X
Category: USB Converters
Package: MSOP-10
Pins: 10
In stock: 48,519 at JLCPCB (C3035748)
Used on: 43 open-source boards

Overview

The CH340X is a USB Converter made by WCH (Nanjing Qinheng Microelectronics) in a MSOP-10 package with 10 pins. -20℃~+70℃ 2Mbps 3.3V、5V USB 2.0 USB to serial、USB to Parallel MSOP-10 USB Converters ROHS.

PCBKit's library has its KiCad symbol (Interface_USB:CH340X, from KiCad's library) and its footprint (Package_SO:MSOP-10_3x3mm_P0.5mm, from KiCad's library), ready for a KiCad board. 48,519 are in stock at JLCPCB (part C3035748). 43 open-source boards in 38 repositories on GitHub use it.

Symbol

Interface_USB:CH340XFrom KiCad's library

Footprint

Package_SO:MSOP-10_3x3mm_P0.5mmFrom KiCad's library

From the datasheet

Supply, least: 4 V · VCC, recommended minimum for 5V operation; V3 connected only to capacitor · p. 5
Supply, most: 5.3 V · VCC, recommended maximum for 5V operation; V3 connected only to capacitor · p. 5
Supply, least: 3.1 V · VCC, recommended minimum for 3.3V operation; V3 connected to VCC · p. 5
Supply, most: 3.6 V · VCC, recommended maximum for 3.3V operation; V3 connected to VCC · p. 5
Supply, absolute maximum: 6 V · VCC, absolute maximum · p. 5
Works from: -20 °C · Operating ambient minimum, CH340X · p. 5
Works up to: 70 °C · Operating ambient maximum, CH340X · p. 5
Takes working: 7 mA · Typical total operating supply current, VCC=5V, TA=25℃ · p. 5
Takes working: 4 mA · Typical total operating supply current, VCC=V3=3.3V, TA=25℃ · p. 5
Takes at most: 20 mA · Maximum total operating supply current, VCC=5V, TA=25℃ · p. 5
Takes at most: 12 mA · Maximum total operating supply current, VCC=V3=3.3V, TA=25℃ · p. 5
Takes asleep: 50 µA · Typical USB suspend supply current, VCC=5V, TA=25℃ · p. 5
Takes asleep: 40 µA · Typical USB suspend supply current, VCC=V3=3.3V, TA=25℃ · p. 5
Data rate, most: 2 Mbit/s · Maximum supported UART baud rate · p. 1

What it is and has

USB: Full-speed device interface, USB V2.0 compatible · p. 1
UART: Hardware full duplex, internal transmit and receive buffers, 50bps～2Mbps · p. 1
Clock: Internal clock generator; no external crystal or capacitors required · p. 3
I/O tolerance: 5V tolerant I/O with 3.3V supply · p. 2
Protection: I/O prevents inward current backfeeding · p. 3
Driver compatibility: Built-in firmware; compatible with CH341 VCP driver · p. 1
Package: MSOP-10, 3.0mm body width, 0.50mm pin pitch · p. 2

Around it

cap 0.1μF: between V3 and GND; C8, internal 3.3V node decoupling for 5V operation; place close to the pin. · p. 6
res 4.7KΩ: between TNOW/DTR# (6) and GND; Optional pull-down selects open-source DTR enhanced mode; DTR# defaults to no drive and is held low. · p. 4
res 4.7KΩ: between TNOW/DTR# (6) and pin 5; Alternative configuration selects push-pull DTR enhanced mode with default high DTR#. · p. 4
res 2KΩ～22KΩ: between MCU RXD and MCU VDD; For the separate-supply connection, add if the MCU RXD has no internal pull-up. · p. 9
res 1～2KΩ: between RTS# and MCU NRST; Optional series resistor when NRST must also support manual reset. · p. 10

Specifications

Parameter	Conditions	As printed	Page
工作时的环境温度 TA	CH340X（CH340C/N/K/E/X/B）	min -20 · max 70 ℃	5
储存时的环境温度 TS		min -55 · max 125 ℃	5
电源电压 VCC	VCC 接电源，GND 接地	min -0.5 · max 6 V	5
输入或者输出引脚上的电压 VIO	最大值为 VCC+0.5	min -0.5 V	5
电源电压 VCC	TA=25℃，VCC=5V，不包括连接 USB 总线的引脚；V3 引脚仅外接电容，不连 VCC	min 4 · typ 5 · max 5.3 V	5
工作时总电源电流 ICC	CH340X；TA=25℃，VCC=5V，不包括连接 USB 总线的引脚	typ 7 · max 20 mA	5
USB 挂起时的总电源电流 ISLP	CH340X；TA=25℃，VCC=5V，不包括连接 USB 总线的引脚	typ 0.05 · max 0.15 mA	5
低电平输入电压 VIL	TA=25℃，VCC=5V，不包括连接 USB 总线的引脚	min 0 · max 0.9 V	5
高电平输入电压 VIH	TA=25℃，VCC=5V，不包括连接 USB 总线的引脚；最大值为 VCC	min 2.3 V	5
低电平输出电压 VOL	TA=25℃，VCC=5V，不包括连接 USB 总线的引脚；6mA 吸入电流	max 0.5 V	5
内置上拉电阻的输入端的输入电流 IUP	TA=25℃，VCC=5V，不包括连接 USB 总线的引脚	min 3 · typ 150 · max 300 uA	5
内置下拉电阻的输入端的输入电流 IDN	TA=25℃，VCC=5V，不包括连接 USB 总线的引脚	min -40 · typ -100 · max -300 uA	5
电源上电复位的电压门限 VR	TA=25℃，VCC=5V，不包括连接 USB 总线的引脚	min 2.4 · typ 2.6 · max 2.8 V	5
电源电压 VCC	CH340X；TA=25℃，VCC=V3=3.3V，不包括连接 USB 总线的引脚；V3 引脚连接 VCC 引脚	min 3.1 · typ 3.3 · max 3.6 V	5
工作时总电源电流 ICC	CH340X；TA=25℃，VCC=V3=3.3V，不包括连接 USB 总线的引脚	typ 4 · max 12 mA	5
USB 挂起时的总电源电流 ISLP	CH340X；TA=25℃，VCC=V3=3.3V，不包括连接 USB 总线的引脚	typ 0.04 · max 0.15 mA	5
低电平输入电压 VIL	TA=25℃，VCC=V3=3.3V，不包括连接 USB 总线的引脚	min 0 · max 0.8 V	5
高电平输入电压 VIH	TA=25℃，VCC=V3=3.3V，不包括连接 USB 总线的引脚；最大值为 VCC	min 1.9 V	5
低电平输出电压 VOL	TA=25℃，VCC=V3=3.3V，不包括连接 USB 总线的引脚；4mA 吸入电流	max 0.5 V	5
内置上拉电阻的输入端的输入电流 IUP	TA=25℃，VCC=V3=3.3V，不包括连接 USB 总线的引脚	min 3 · typ 70 · max 200 uA	5
内置下拉电阻的输入端的输入电流 IDN	TA=25℃，VCC=V3=3.3V，不包括连接 USB 总线的引脚	min -30 · typ -70 · max -200 uA	5
电源上电复位的电压门限 VR	TA=25℃，VCC=V3=3.3V，不包括连接 USB 总线的引脚	min 2.4 · typ 2.6 · max 2.8 V	5
内部时钟的误差（同比影响波特率） FD	CH340X；VCC=5V 或 3.3V；TA=-5℃～55℃；典型值为 ±0.8%	min -1.2 · max 1.2 %	6
内部时钟的误差（同比影响波特率） FD	CH340X；VCC=5V 或 3.3V；TA=-25℃～75℃；典型值为 ±1.0%	min -1.8 · max 1.8 %	6
电源上电的复位时间 TPR	TA=25℃，VCC=5V 或 3.3V	min 20 · typ 35 · max 50 mS	6

Pins, by the datasheet

6 TNOW: Serial transmit activity output for half-duplex direction control; weak pull-up during reset; external resistor configuration can select DTR#. · p. 4

Ordering codes, by the datasheet

CH340X: MSOP-10 · 3.0mm body width, 0.50mm pin pitch; internal clock, 5V-tolerant I/O at 3.3V supply, configurable TNOW/DTR# pin · p. 2

Parameters

Applications Function: USB to Parallel
Current - Supply: 7mA
Current - Supply(Max): 20mA
Data Rate: 2Mbps
Features: Programmable baud rate；Built-in clock generator；Power-off protection；Power-on reset
Operating Temperature: -20℃~+70℃
Standby Current: 50uA
USB Protocol: USB 2.0
Voltage - Supply: 3.1V~5.3V
Voltage - Supply(Absolute Max): 6V

Order codes

CH340XLCSC C3035748

Pinout

The pins of the CH340X
Pin	Name	Type
1	UD+	Input/output
2	UD-	Input/output
3	GND	Power in
4	RTS	Output
5	CTS	Input
6	TNOW/DTR	Output
7	VCC	Power in
8	TXD	Output
9	RXD	Input
10	V3	Power out

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Parts like it

Questions

Is there a KiCad symbol and footprint for the CH340X?

Yes. The symbol is Interface_USB:CH340X and the footprint Package_SO:MSOP-10_3x3mm_P0.5mm, both drawn on this page. PCBKit places them on a board for you when you design with it.

What package is the CH340X?

MSOP-10, with 10 pins. Its footprint is drawn on this page.

Where is the CH340X datasheet?

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

Where can I order the CH340X?

JLCPCB lists it as part C3035748, with 48,519 in stock; the sellers' links on this page open their listings.

What can replace the CH340X?

Parts like it in the library: the CH340E by WCH (Nanjing Qinheng Microelectronics), the DIO32220MP10 by DIOO, the DIO32320MP10 by DIOO and the COM-16278 by SparkFun Electronics. Check their datasheets: a part that fits the footprint may still differ in its ratings.

Which open-source boards use the CH340X?

43 boards in 38 repositories on GitHub; the most starred are listed on this page, with their KiCad files.