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CH340C

Public Made by Adom

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WCH Jiangsu Qin Heng USB Converters, SOP-16. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Made with kicad-footprint-generator 10.0 · KiCad file format 20260206
Name Last commit message Last updated
docs ch340c: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 2d ago
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray 1mo ago
ch340c-etched.fit.json ch340c: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 2d ago
ch340c-etched.glb ch340c: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 2d ago
ch340c-etched.step ch340c: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 2d ago
ch340c.glb Publish 0.1.0 · Ray 1mo ago
ch340c.kicad_mod Publish 0.1.0 · Ray 1mo ago
ch340c.kicad_sym Publish 0.1.0 · Ray 1mo ago
ch340c.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect and oval pad as a SQUARE EAGLE smd; this carries the real pad shape across (0 -> 16 rounded pads) and stops dropping geometry drawn on KiCad User.N layers. Attributes, connects, pads and the pin-1 marker are gated against decreasing and are unchanged. · Ray 1mo ago
ch340c.step Publish 0.1.0 · Ray 1mo ago
package.json Publish 0.2.0 · Ray 1mo ago
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray 1mo ago
page.json Brief states the pinout check that actually ran (was an unconditional "Datasheet-verified pinout") · Ray 11d ago
README.md ch340c: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray 17d ago

CH340C

WCH Jiangsu Qin Heng · USB Converters · SOP-16

CH340C from WCH Jiangsu Qin Heng, in a SOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 GND power_in Common ground reference. Connect directly to the USB bus ground.
2 TXD output Serial data output (UART TX). Idles high on CH340C.
3 RXD input Serial data input (UART RX) with internal software-controllable pull-up and pull-down.
4 V3 power_in Internal 3.3 V regulator node. In 5 V operation, connect a 0.1 uF decoupling capacitor to GND. In 3.3 V operation, tie V3 to VCC and to the external 3.3 V supply.
5 UD+ bidirectional USB D+ data line. Connect directly to the USB bus D+; do not add a series resistor (internal USB pull-up and transceiver are integrated).
6 UD- bidirectional USB D- data line. Connect directly to the USB bus D-; do not add a series resistor.
7 NC unconnected No connect on CH340C. Must be left floating.
8 OUT#/DTR# output MODEM general-purpose output signal (software defined, active low). On CH340C batches whose lot code starts with 4 and whose last three digits are greater than B40, adding a 4.7 kΩ pull-down converts this pin to a second DTR#.
9 CTS# input MODEM Clear-To-Send handshake input, active low (or high when auxiliary RS-232 mode is enabled).
10 DSR# input MODEM Data Set Ready handshake input, active low (or high in auxiliary RS-232 mode).
11 RI# input MODEM Ring Indicator input, active low (or high in auxiliary RS-232 mode).
12 DCD# input MODEM Data Carrier Detect input, active low (or high in auxiliary RS-232 mode).
13 DTR# output MODEM Data Terminal Ready output, active low (or high in auxiliary RS-232 mode). Used for MCU DTR#-default-high one-key download flows.
14 RTS# output MODEM Request To Send output, active low (or high in auxiliary RS-232 mode).
15 R232 input Auxiliary RS-232 enable input, active high, with internal pull-down. When high, an inverter is inserted on RXD and the MODEM signal polarities invert. Sampled only once at power-on reset.
16 VCC power_in Positive supply input. Requires a 0.1 uF decoupling capacitor to GND. Accepts 5 V (4.0-5.3 V) or 3.3 V (3.1-3.6 V, with V3 tied to VCC).

Key specifications

Parameter Value
Manufacturer WCH Jiangsu Qin Heng
Package SOP-16
Category Interface
Pins 16

Ordering variants

Same part, different packaging or reel option.

  • CH340C
  • CH340G
  • CH340B
  • CH340N
  • CH340K
  • CH340E
  • CH340X
  • CH340T
  • CH340R

CAD (KiCad official)

  • Symbol: CH340C
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOP-16 (KiCad packages3D, STEP)
  • 3D model files: ch340c-etched.step / ch340c-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ch340c.step / ch340c.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
ch340c.step 217 KB You want the bare part, or you mark your own boards.
ch340c-etched.step 2.0 MB You want the part with CH340C already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 488 faces against 267 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: WCH Jiangsu Qin Heng datasheet (10 pp, sha256 ea6cde8472044256, retrieved 2026-08-17, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF