CH343G

{
  "schema_version": 1,
  "type": "component",
  "slug": "ch343g",
  "title": "CH343G",
  "brief": "WCH Jiangsu Qin Heng USB Converters, SOP-16. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "ch343g"
  ],
  "component": {
    "mpn": "CH343G",
    "manufacturer": "WCH Jiangsu Qin Heng",
    "package": "SOP-16",
    "pin_count": 16,
    "category": "Interface",
    "subcategory": "USB Converters",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/60ab625effae247ff0bd8e1f7ad25257.pdf",
    "parts": {
      "symbol": "ch343g.kicad_sym",
      "footprint": "ch343g.kicad_mod",
      "model_3d": "ch343g-etched.glb",
      "model_3d_plain": "ch343g.glb",
      "model_3d_step": "ch343g-etched.step",
      "model_3d_step_plain": "ch343g.step",
      "lbr": "ch343g.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground reference; must connect to USB bus ground."
      },
      {
        "number": "2",
        "name": "TXD",
        "type": "output",
        "description": "UART serial data output. Idle state is high."
      },
      {
        "number": "3",
        "name": "RXD",
        "type": "input",
        "description": "UART serial data input with internal pull-up to VIO."
      },
      {
        "number": "4",
        "name": "V3",
        "type": "power_in",
        "description": "Internal 3.3V LDO output; also core and USB PHY supply. Requires ~0.1uF decoupling. When VDD5<3.6V, tie V3 to VDD5 and feed external 3.3V; when VDD5>3.6V, use only a decoupling capacitor."
      },
      {
        "number": "5",
        "name": "UD+",
        "type": "bidirectional",
        "description": "USB D+ data line, connects directly to USB bus. Do NOT add series resistor (internal PHY includes required pull-up)."
      },
      {
        "number": "6",
        "name": "UD-",
        "type": "bidirectional",
        "description": "USB D- data line, connects directly to USB bus. Do NOT add series resistor."
      },
      {
        "number": "7",
        "name": "VBUS",
        "type": "input",
        "description": "USB VBUS presence detect input with internal pull-down (controllable via MCR OUT1). Loss of VBUS triggers USB suspend/sleep."
      },
      {
        "number": "8",
        "name": "ACT#",
        "type": "output",
        "description": "USB configuration-complete status output, active low. High-Z (inactive) during USB suspend. Typically drives an activity LED via a current-limit resistor to VIO."
      },
      {
        "number": "9",
        "name": "DCD",
        "type": "input",
        "description": "MODEM handshake input: Data Carrier Detect, active low."
      },
      {
        "number": "10",
        "name": "DTR/TNOW",
        "type": "output",
        "description": "Default MODEM handshake output DTR (Data Terminal Ready, active low). If an external ~4.7kΩ pull-down is detected at power-up, the pin auto-switches to TNOW (transmit-in-progress status, active high) for RS-485 half-duplex driver enable."
      },
      {
        "number": "11",
        "name": "RTS",
        "type": "output",
        "description": "MODEM handshake output: Request To Send, active low. Used by hardware auto flow control."
      },
      {
        "number": "12",
        "name": "DSR",
        "type": "input",
        "description": "MODEM handshake input: Data Set Ready, active low."
      },
      {
        "number": "13",
        "name": "CTS",
        "type": "input",
        "description": "MODEM handshake input: Clear To Send, active low. Used by hardware auto flow control."
      },
      {
        "number": "14",
        "name": "RI",
        "type": "input",
        "description": "MODEM handshake input: Ring Indicator, active low."
      },
      {
        "number": "15",
        "name": "VIO",
        "type": "power_in",
        "description": "I/O rail supply for UART and control pins. Accepts 1.8V-5V; should share supply with attached MCU/peripheral. Requires external decoupling capacitor. Does not back-feed VDD5/V3."
      },
      {
        "number": "16",
        "name": "VDD5",
        "type": "power_in",
        "description": "Positive supply input to the internal 3.3V LDO. Accepts 5V (typical, from USB VBUS) or 3.3V (when tied to V3). Absolute max 6.0V. Requires external decoupling capacitor."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/60ab625effae247ff0bd8e1f7ad25257.pdf",
        "pages": 8,
        "sha256": "656a3a7bd49d78a4",
        "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"
    },
    "models_3d": [
      {
        "file": "ch343g.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          9.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ch343g-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          9.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "fc4c3ace777940e312c993ea0d2ad044778c5be2cf8350a12bf78dd28e605418",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "WCH Jiangsu Qin Heng",
      "Package": "SOP-16",
      "Category": "Interface",
      "Pins": "16"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ch343g"
  ],
  "discovery_pitch": "CH343G (WCH Jiangsu Qin Heng) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ch343g.kicad_sym",
    "ch343g.kicad_mod",
    "ch343g.glb",
    "ch343g.step",
    "ch343g.lbr",
    "docs/hero.png",
    "docs/ch343g-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ch343g-etched.step"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "CH343G",
      "kind": "packaging"
    },
    {
      "mpn": "CH343C",
      "kind": "unknown"
    },
    {
      "mpn": "CH343P",
      "kind": "unknown"
    },
    {
      "mpn": "CH343K",
      "kind": "unknown"
    }
  ],
  "updated_at": "2026-09-24T19:00:28.523Z"
}