CH340N

WCH (Nanjing Qinheng Microelectronics)

-20℃~+70℃ 1 2Mbps 3.3V、5V USB 2.0 USB to serial SOP-8 USB Converters ROHS

Extended

Category: USB Converters
Package: SOP-8
Pins: 8

Overview

The CH340N is a USB Converter made by WCH (Nanjing Qinheng Microelectronics) in a SOP-8 package with 8 pins. -20℃~+70℃ 1 2Mbps 3.3V、5V USB 2.0 USB to serial SOP-8 USB Converters ROHS.

PCBKit's library has its KiCad symbol (Interface_USB:CH340N, from KiCad's library) and its footprint (Package_SO:JEITA_SOIC-8_3.9x4.9mm_P1.27mm, from KiCad's library), ready for a KiCad board. 49,036 are in stock at JLCPCB (part C2977777). 132 open-source boards in 97 repositories on GitHub use it.

Symbol

Interface_USB:CH340NFrom KiCad's library

Footprint

Package_SO:JEITA_SOIC-8_3.9x4.9mm_P1.27mmFrom KiCad's library

From the datasheet

Supply, least: 4 V · VCC, recommended operating min, 5V mode; V3 capacitor only · p. 5
Supply, most: 5.3 V · VCC, recommended operating max, 5V mode; V3 capacitor only · p. 5
Supply, least: 3.1 V · VCC, recommended operating min, 3.3V mode; V3 connected to VCC · p. 5
Supply, most: 3.6 V · VCC, recommended operating max, 3.3V mode; V3 connected to VCC · p. 5
Supply, absolute maximum: 6 V · VCC, absolute max · p. 5
Works from: -20 °C · Operating ambient min, CH340N · p. 5
Works up to: 70 °C · Operating ambient max, CH340N · p. 5
Takes working: 7 mA · VCC operating current typical, 5V, TA=25℃ · p. 5
Takes working: 4 mA · VCC operating current typical, VCC=V3=3.3V, TA=25℃ · p. 5
Takes at most: 20 mA · VCC operating current max, 5V, TA=25℃ · p. 5
Takes at most: 12 mA · VCC operating current max, VCC=V3=3.3V, TA=25℃ · p. 5
Takes asleep: 50 µA · USB suspend current typical, 5V, TA=25℃ · p. 5
Takes asleep: 40 µA · USB suspend current typical, VCC=V3=3.3V, TA=25℃ · p. 5
Data rate, most: 2 Mbit/s · UART baud rate max · 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; no external crystal or capacitors required · p. 3
Supply options: 5V or 3.3V · p. 1
Firmware and driver: Built-in firmware, CH341 software compatible, CH341 VCP driver supported · p. 1
Package: SOP-8 · p. 2
I/O protection: CH340N with batch number starting with 4: 5V tolerant, prevents inward current backflow · p. 3

Around it

cap 0.1uF: between VCC and GND; Supply decoupling; place close to the connected pin. · p. 2
cap 0.1μF: between V3 and GND; C8, internal 3.3V node decoupling in 5V supply mode; place close to the connected pin. · p. 6
res 2KΩ～22KΩ: between MCU RXD and MCU VDD; Separate-supply application: add a pull-up if the MCU RXD has no internal pull-up. · p. 9
res 约为 1Ω: between USB 5V and USB product 5V permanent supply; When using USB power together with the product's permanent supply; connect their grounds directly. · p. 6

Specifications

Parameter	Conditions	As printed	Page
工作时的环境温度 TA	CH340N (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 接电源，GND 接地） VCC		min -0.5 · max 6 V	5
输入或者输出引脚上的电压 VIO	Maximum is VCC+0.5	min -0.5 V	5
电源电压 VCC	TA=25℃; 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	CH340N; TA=25℃, VCC=5V	typ 7 · max 20 mA	5
USB 挂起时的总电源电流 ISLP	CH340N; TA=25℃, VCC=5V	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; maximum is VCC	min 2.3 V	5
低电平输出电压（6mA 吸入电流） VOL	TA=25℃, VCC=5V; 不包括连接 USB 总线的引脚	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	min 2.4 · typ 2.6 · max 2.8 V	5
电源电压 VCC	CH340N; TA=25℃; 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	CH340N; TA=25℃, VCC=V3=3.3V	typ 4 · max 12 mA	5
USB 挂起时的总电源电流 ISLP	CH340N; TA=25℃, VCC=V3=3.3V	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; maximum is VCC	min 1.9 V	5
低电平输出电压（4mA 吸入电流） VOL	TA=25℃, VCC=V3=3.3V; 不包括连接 USB 总线的引脚	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	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	CH340N; TA=-5℃～55℃, VCC=5V 或 3.3V; typical is ±0.8%	min -1.2 · max 1.2 %	6
内部时钟的误差（同比影响波特率） FD	CH340N; TA=-25℃～75℃, VCC=5V 或 3.3V; typical is ±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

1 UD+: 直接连到 USB 总线的 D+数据线，不要串联电阻。 · p. 2
2 UD-: 直接连到 USB 总线的 D-数据线，不要串联电阻。 · p. 2
3 GND: 公共接地端，直接连到 USB 总线的地线。 · p. 2
4 RTS#: MODEM 联络输出信号，请求发送，低电平有效。 · p. 3
5 VCC: 正电源输入端，需要外接 0.1uF 电源退耦电容。 · p. 2
6 TXD: 串行数据输出。 · p. 2
7 RXD: 串行数据输入，内置可控的上拉和下拉电阻。 · p. 2
8 V3: 3.3V 供电时连接 VCC 输入外部电源；5V 供电时外接 0.1uF 退耦电容。 · p. 2

Ordering codes, by the datasheet

CH340N: SOP-8 · Standard 8-pin surface-mount package; internal clock · p. 2

Parameters

Applications Function: USB to serial
Current - Supply: 7mA
Current - Supply(Max): 20mA
Data Rate: 2Mbps
Features: Programmable baud rate；Built-in clock generator；Power-on reset
Number of Channels: 1
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

CH340NLCSC C2977777
CH340NLCSC C506813

Pinout

The pins of the CH340N
Pin	Name	Type
1	UD+	Input/output
2	UD-	Input/output
3	GND	Power in
4	RTS	Output
5	VCC	Power in
6	TXD	Output
7	RXD	Input
8	V3	Passive

Open-source boards using it

All 132

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A matrix LED WiFi clock.
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245 parts19
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IIsiA7 Mini
MelkhiorVintageComputing/IIsiFPGA
Stuff to put a FPGA in a Macintosh IIsi
219 parts18
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tjclement/ecsc23-badge
This repo contains the hardware designs and firmware developed for the ECSC23 hardware challenge by Curious Supplies.
147 parts10
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baoqi-zhong/Awesome-SMT-Machine
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188 parts9
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dilshan/24ch-usb-high-voltage-driver
24-Channel USB high voltage driver.
35 parts5MIT

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Questions

Is there a KiCad symbol and footprint for the CH340N?

Yes. The symbol is Interface_USB:CH340N and the footprint Package_SO:JEITA_SOIC-8_3.9x4.9mm_P1.27mm, both drawn on this page. PCBKit places them on a board for you when you design with it.

What package is the CH340N?

SOP-8, with 8 pins. Its footprint is drawn on this page.

Where is the CH340N datasheet?

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

Where can I order the CH340N?

JLCPCB lists it as part C2977777, with 49,036 in stock; the sellers' links on this page open their listings.

Which open-source boards use the CH340N?

132 boards in 97 repositories on GitHub; the most starred are listed on this page, with their KiCad files.