Build with CH340C — Datasheet Specs & AI Design Help

00 — Overview

What the CH340C does

The CH340x family are USB-to-UART bridge chips available in CH340G, CH340C, CH340B, CH340N, CH340K, CH340E, CH340X, CH340T, and CH340R variants. These devices support full-speed USB 2.0, operate on 3.3V or 5V supplies, and handle baud rates from 50bps to 2Mbps. They provide hardware full-duplex serial communication with built-in buffers and standard MODEM control signals like RTS, DTR, CTS, and DSR. The chips are typically used to upgrade legacy serial peripherals to USB interfaces or to expand computer ports without software modification. Some variants include an internal clock, EEPROM for serial number configuration, or support for RS232, RS485, and IrDA protocols.

Next step

Start building with CH340C → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.

01 — Key specifications

Datasheet parameters

Datasheet parameters for CH340C
Parameter	Min	Typ	Max	Conditions	Source
supply voltage range	4 V	—	5.3 V	5V supply: V3 pin only external capacitor, not connected to VCC	WCH datasheet, p. 5 — 6、参数
operating temperature	-20 °C	—	70 °C	CH340C/CH340N/CH340K/CH340E/CH340B; ta; 6、参数	WCH datasheet, p. 5 — 6、参数
clock frequency	12 MHz	12 MHz	12 MHz	fclk; 6、参数	WCH datasheet, p. 6 — 6、参数
data rate	50 bps	—	2 Mbps		WCH datasheet, p. 1
channel count	—	1	—		WCH datasheet, p. 4
driver count	—	1	—		WCH datasheet, p. 3
receiver count	—	1	—		WCH datasheet, p. 3

02 — Alternatives

Closest matches to CH340C

GM3085E 1.1× lower operating temperature, 1.1× lower supply voltage range, similar data rate

ADM2483BRW 2.0× lower data rate, 1.1× lower supply voltage range, 1.1× lower operating temperature

GM3232E 2.0× lower data rate, 1.4× lower supply voltage range, 1.1× lower operating temperature

GM3485E 10.0× higher data rate, 1.1× lower operating temperature, 1.1× lower supply voltage range

MAX3232 4.0× lower data rate, 1.4× higher operating temperature, 1.1× lower supply voltage range

MAX485ESA 2.5× higher data rate, 1.3× higher operating temperature, 1.1× higher supply voltage range

PCA9509 5.0× lower data rate, 1.1× lower operating temperature, 1.1× lower supply voltage range

SN65HVD3082E 5.0× lower data rate, 1.1× lower operating temperature, 1.1× higher supply voltage range

03 — FAQ

Frequently asked questions

What is the channel count of the CH340C?

The channel count is 1.

What is the clock frequency (fclk) specified in parameter 6?

The clock frequency (fclk) is 12 MHz.

What is the maximum data rate of the CH340C?

The data rate is 2 Mbps.

What is the driver count for the CH340C?

The driver count is 1.

What is the operating temperature for the CH340C/CH340N/CH340K/CH340E/CH340B at ta (6、参数)?

The operating temperature is 70 °C.

What is the receiver count for the CH340C?

The receiver count is 1.

What is the supply voltage range for the CH340C when the 5V supply is connected to the V3 pin with only an external capacitor and not connected to VCC?

The supply voltage range is 5.3 V.