CH340N

{
  "schema_version": 1,
  "type": "component",
  "slug": "ch340n",
  "title": "CH340N",
  "brief": "WCH Jiangsu Qin Heng USB Converters, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "ch340n"
  ],
  "component": {
    "mpn": "CH340N",
    "manufacturer": "WCH Jiangsu Qin Heng",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "Interface",
    "subcategory": "USB Converters",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2403131131_WCH-Jiangsu-Qin-Heng-CH340N_C2977777.pdf",
    "parts": {
      "symbol": "ch340n.kicad_sym",
      "footprint": "ch340n.kicad_mod",
      "model_3d": "ch340n-etched.glb",
      "model_3d_plain": "ch340n.glb",
      "model_3d_step": "ch340n-etched.step",
      "model_3d_step_plain": "ch340n.step",
      "lbr": "ch340n.lbr"
    },
    "distributor_links": {
      "lcsc": "C2977777"
    },
    "pins": [
      {
        "number": "1",
        "name": "UD+",
        "type": "bidirectional",
        "description": "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."
      },
      {
        "number": "2",
        "name": "UD-",
        "type": "bidirectional",
        "description": "USB D- data line. Connect directly to the USB bus D-; do not add a series resistor."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground. Connect directly to the USB bus ground."
      },
      {
        "number": "4",
        "name": "RTS#",
        "type": "output",
        "description": "MODEM Request-To-Send output, active low (software-controllable polarity). Only MODEM handshake line brought out on the SOP-8 CH340N."
      },
      {
        "number": "5",
        "name": "VCC",
        "type": "power_in",
        "description": "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)."
      },
      {
        "number": "6",
        "name": "TXD",
        "type": "output",
        "description": "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)."
      },
      {
        "number": "7",
        "name": "RXD",
        "type": "input",
        "description": "UART serial data input. Has software-controllable internal pull-up and pull-down resistors. Should idle high."
      },
      {
        "number": "8",
        "name": "V3",
        "type": "power_out",
        "description": "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."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2403131131_WCH-Jiangsu-Qin-Heng-CH340N_C2977777.pdf",
        "pages": 10,
        "sha256": "6a6922d3c4de2d4f",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "ch340n.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ch340n-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "17beac9d7fc4db5441e3ef39fe15142d4466871174443232620eb86d8489d75b",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Unknown",
      "Package": "SOP-8",
      "Category": "Interface",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ch340n"
  ],
  "discovery_pitch": "CH340N (Unknown) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ch340n.kicad_sym",
    "ch340n.kicad_mod",
    "ch340n.glb",
    "ch340n.step",
    "ch340n-etched.step",
    "ch340n.lbr",
    "docs/hero.png",
    "docs/ch340n-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "variants": [
    {
      "mpn": "CH340N",
      "kind": "packaging"
    },
    {
      "mpn": "CH340G",
      "kind": "unknown"
    },
    {
      "mpn": "CH340C",
      "kind": "unknown"
    },
    {
      "mpn": "CH340B",
      "kind": "unknown"
    },
    {
      "mpn": "CH340K",
      "kind": "unknown"
    },
    {
      "mpn": "CH340E",
      "kind": "unknown"
    },
    {
      "mpn": "CH340X",
      "kind": "unknown"
    },
    {
      "mpn": "CH340T",
      "kind": "unknown"
    },
    {
      "mpn": "CH340R",
      "kind": "unknown"
    }
  ],
  "updated_at": "2026-09-24T19:00:20.568Z"
}