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Ch340 Datasheet (I) 1 usb to Serial Port Chip ch340CH340DS1 (1)CH340 Datasheet (I)
2
Package
Body size
Lead pitch
Description
Part No.
SOP-16
3.9mm 150mil 1.27mm 50mil
Small outline 16-pin patch
CH340G
SOP-16
3.9mm 150mil 1.27mm 50mil
Small outline 16-pin patch
CH340C
SOP-16
3.9mm 150mil 1.27mm 50mil
Small outline 16-pin patch
CH340B
SOP-8
3.9mm 150mil 1.27mm 50mil
Small outline 8-pin patch
CH340N
ESSOP-10 3.9mm 150mil 1.00mm 39mil
Shrink Small outline 10-pin patch with
EPAD
CH340K
MSOP-10 3.0mm 118mil 0.50mm 19.7mil
Micro Small outline 10-pin patch
CH340E
MSOP-10 3.0mm 118mil 0.50mm 19.7mil
Micro Small outline 10-pin patch
CH340X
SSOP-20 5.3mm 209mil 0.65mm 25mil
Shrink Small outline 20-pin patch
CH340T
SSOP-20 5.3mm 209mil 0.65mm 25mil
Shrink Small outline 20-pin patch
CH340R
Note:
CH340C, CH340N, CH340K, CH340E, CH340X and CH340B have integrated clock, no external crystal
required.
CH340B has integrated EEPROM used to configure serial number, some functions can be customized, etc.
CH340K has 3 built-in diodes to reduce current flow backwards between the I/O pins of the MCU.
The EPAD of CH340K is 0# pin (GND), which is an optional connection; the 3# pin (GND) is the necessary
connection.
CH340X is improved based on CH340E, with 5V tolerant characteristic added when the power supply is
3.3V.
6# pin of CH340X can be changed from TNOW to DTR# when an external resistor is connected, see Section
5.3 for the two configurations.
CH340C whose batch number begins with 4 and last 3-digit greater than B40, 8# pin can be changed to
DTR# when a 4.7K
Ω
pull-down resistor is connected.
CH340R provides reverse polarity TXD and MODEM interface signals, discontinued.
The USB transceiver of CH340 is designed according to the built-in design of USB2.0, and it is
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