CH340C

{
  "schema_version": 1,
  "type": "component",
  "slug": "ch340c",
  "title": "CH340C",
  "brief": "WCH Jiangsu Qin Heng USB Converters, SOP-16. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "ch340c"
  ],
  "component": {
    "mpn": "CH340C",
    "manufacturer": "WCH Jiangsu Qin Heng",
    "package": "SOP-16",
    "pin_count": 16,
    "category": "Interface",
    "subcategory": "USB Converters",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2403131141_WCH-Jiangsu-Qin-Heng-CH340C_C7464026.pdf",
    "parts": {
      "symbol": "ch340c.kicad_sym",
      "footprint": "ch340c.kicad_mod",
      "model_3d": "ch340c-etched.glb",
      "model_3d_plain": "ch340c.glb",
      "model_3d_step": "ch340c-etched.step",
      "model_3d_step_plain": "ch340c.step",
      "lbr": "ch340c.lbr"
    },
    "distributor_links": {
      "lcsc": "C7464026"
    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground reference. Connect directly to the USB bus ground."
      },
      {
        "number": "2",
        "name": "TXD",
        "type": "output",
        "description": "Serial data output (UART TX). Idles high on CH340C."
      },
      {
        "number": "3",
        "name": "RXD",
        "type": "input",
        "description": "Serial data input (UART RX) with internal software-controllable pull-up and pull-down."
      },
      {
        "number": "4",
        "name": "V3",
        "type": "power_in",
        "description": "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."
      },
      {
        "number": "5",
        "name": "UD+",
        "type": "bidirectional",
        "description": "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)."
      },
      {
        "number": "6",
        "name": "UD-",
        "type": "bidirectional",
        "description": "USB D- data line. Connect directly to the USB bus D-; do not add a series resistor."
      },
      {
        "number": "7",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect on CH340C. Must be left floating."
      },
      {
        "number": "8",
        "name": "OUT#/DTR#",
        "type": "output",
        "description": "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#."
      },
      {
        "number": "9",
        "name": "CTS#",
        "type": "input",
        "description": "MODEM Clear-To-Send handshake input, active low (or high when auxiliary RS-232 mode is enabled)."
      },
      {
        "number": "10",
        "name": "DSR#",
        "type": "input",
        "description": "MODEM Data Set Ready handshake input, active low (or high in auxiliary RS-232 mode)."
      },
      {
        "number": "11",
        "name": "RI#",
        "type": "input",
        "description": "MODEM Ring Indicator input, active low (or high in auxiliary RS-232 mode)."
      },
      {
        "number": "12",
        "name": "DCD#",
        "type": "input",
        "description": "MODEM Data Carrier Detect input, active low (or high in auxiliary RS-232 mode)."
      },
      {
        "number": "13",
        "name": "DTR#",
        "type": "output",
        "description": "MODEM Data Terminal Ready output, active low (or high in auxiliary RS-232 mode). Used for MCU DTR#-default-high one-key download flows."
      },
      {
        "number": "14",
        "name": "RTS#",
        "type": "output",
        "description": "MODEM Request To Send output, active low (or high in auxiliary RS-232 mode)."
      },
      {
        "number": "15",
        "name": "R232",
        "type": "input",
        "description": "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."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "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)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2403131141_WCH-Jiangsu-Qin-Heng-CH340C_C7464026.pdf",
        "pages": 10,
        "sha256": "ea6cde8472044256",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -4.445
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-16_3.9x9.9mm_P1.27mm@sha256:f9b5075740f7816c",
      "mark": "drawn"
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Unknown",
      "Package": "SOP-16",
      "Category": "Interface",
      "Pins": "16"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ch340c"
  ],
  "discovery_pitch": "CH340C (Unknown) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ch340c.kicad_sym",
    "ch340c.kicad_mod",
    "ch340c.glb",
    "ch340c.step",
    "ch340c-etched.step",
    "ch340c.lbr",
    "docs/hero.png",
    "docs/ch340c-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "variants": [
    {
      "mpn": "CH340C",
      "kind": "packaging"
    },
    {
      "mpn": "CH340G",
      "kind": "unknown"
    },
    {
      "mpn": "CH340B",
      "kind": "unknown"
    },
    {
      "mpn": "CH340N",
      "kind": "unknown"
    },
    {
      "mpn": "CH340K",
      "kind": "unknown"
    },
    {
      "mpn": "CH340E",
      "kind": "unknown"
    },
    {
      "mpn": "CH340X",
      "kind": "unknown"
    },
    {
      "mpn": "CH340T",
      "kind": "unknown"
    },
    {
      "mpn": "CH340R",
      "kind": "unknown"
    }
  ],
  "updated_at": "2026-09-24T19:00:11.689Z"
}