Data Sheet

The Data Sheet of CH340 (the first) 2
3 Package
Package shape Width of plastic Pitch of Pin Instruction of package Ordering type
SOP-16 3.9mm 150mil 1.27mm 50mil Small outline package of 16-pin CH340G
SOP-16 3.9mm 150mil 1.27mm 50mil Small outline package of 16-pin CH340C
SOP-16 3.9mm 150mil 1.27mm 50mil Small outline package of 16-pin CH340B
MSOP-10 3.0mm 118mil 0.50mm 19.7mil Shrink small outline package of 10-pin CH340E
SSOP-20 5.30mm 209mil 0.65mm 25mil Shrink small outline package of 20-pin CH340T
SSOP-20 5.30mm 209mil 0.65mm 25mil Shrink small outline package of 20-pin CH340R
Model differences:
CH340C, CH340E and CH340B have built-in crystal, no
external crystal;
CH340B also has built-in EEPROM used to configure the serial number,etc.Some functions can be customized.
CH340R provides reverse polarity TXD and MODEM signals. (No spot)
4. Pins
SSOP20
Pin No.
SOP16
Pin No.
MSOP10
Pin No.
Pin Name Pin Type
Pin Description (description in bracket is only about
CH340R)
19 16 7 VCC POWER
Positive power input port, requires an external 0.1uF power
decoupling capacitor
8 1 3 GND POWER Public ground, ground connection for USB
5 4 NONE V3 POWER
Connect to VCC to input external power when 3.3V power
supply, connect to 0.1uF decoupling capacitor when 5V
power supply
XI IN
CH340T/R/G: Input of crystal oscillator, connect to crystal
and capacitor
NC. NONE CH340C: No Connection, must be suspended
9 7 NONE
RST# IN CH340B: Input of external reset, active low, built-in