component

CH340N

Public Made by Adom

by adom

WCH Jiangsu Qin Heng USB Converters, SOP-8. 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 ch340n: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
ch340n-etched.fit.json ch340n: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
ch340n-etched.glb ch340n: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
ch340n-etched.step ch340n: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
ch340n.glb Publish 0.1.0 · Ray
ch340n.kicad_mod Publish 0.1.0 · Ray
ch340n.kicad_sym Publish 0.1.0 · Ray
ch340n.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
ch340n.step Publish 0.1.0 · Ray
package.json Publish 0.2.0 · Ray
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
page.json ch340n: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray
README.md ch340n: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

CH340N

WCH Jiangsu Qin Heng · USB Converters · SOP-8

CH340N from WCH Jiangsu Qin Heng, in a SOP-8. 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 UD+ bidirectional USB D+ data line. Connect directly to the USB bus D+; do not add a series resistor. Internal pull-up and full USB 2.0 full-speed transceiver are integrated.
2 UD- bidirectional USB D- data line. Connect directly to the USB bus D-; do not add a series resistor.
3 GND power_in Common ground. Connect directly to the USB bus ground.
4 RTS# output MODEM Request-To-Send output, active low (software-controllable polarity). Only MODEM handshake line brought out on the SOP-8 CH340N.
5 VCC power_in Positive supply input. Supports 5V (4.0-5.3V) or 3.3V (3.1-3.6V) operation. Requires a 0.1uF decoupling capacitor. In 3.3V mode, tie VCC to V3 (pin 8).
6 TXD output UART serial data output. Idle-high in normal (non-IrDA) mode. Baud rates 50 bps to 2 Mbps; transmit baud error <1.8% on CH340N (internal oscillator).
7 RXD input UART serial data input. Has software-controllable internal pull-up and pull-down resistors. Should idle high.
8 V3 power_out Internal 3.3V regulator node. In 5V operation, connect a 0.1uF decoupling capacitor to GND. In 3.3V operation, tie directly to VCC (pin 5) and feed 3.3V externally.

Key specifications

Parameter Value
Manufacturer WCH Jiangsu Qin Heng
Package SOP-8
Category Interface
Pins 8

Ordering variants

Same part, different packaging or reel option.

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

CAD (KiCad official)

  • Symbol: CH340N
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: ch340n-etched.step / ch340n-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ch340n.step / ch340n.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
ch340n.step 122 KB You want the bare part, or you mark your own boards.
ch340n-etched.step 1.5 MB You want the part with CH340N already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 368 faces against 147 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 6a6922d3c4de2d4f, 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