CH348Q

{
  "schema_version": 1,
  "type": "component",
  "slug": "ch348q",
  "title": "CH348Q",
  "brief": "WCH Jiangsu Qin Heng USB Converters, LQFP-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "ch348q",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "CH348Q",
    "manufacturer": "WCH Jiangsu Qin Heng",
    "package": "LQFP-48(7x7)",
    "pin_count": 48,
    "category": "Interface",
    "subcategory": "USB Converters",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589040309539901440",
    "parts": {
      "symbol": "ch348q.kicad_sym",
      "footprint": "ch348q.kicad_mod",
      "model_3d": "ch348q-etched.glb",
      "model_3d_plain": "ch348q.glb",
      "model_3d_step": "ch348q-etched.step",
      "model_3d_step_plain": "ch348q.step",
      "lbr": "ch348q.lbr"
    },
    "distributor_links": {
      "lcsc": "C2979161"
    },
    "pins": [
      {
        "number": "1",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection, must be left floating."
      },
      {
        "number": "2",
        "name": "CFG",
        "type": "input",
        "description": "TNOW and DTR function configuration pin; high/floating during power-up configures all DTRx/TNOWx as TNOW function; low configures as DTR function with optional independent configuration via pull-down resistors."
      },
      {
        "number": "3",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection, must be left floating."
      },
      {
        "number": "4",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection, must be left floating."
      },
      {
        "number": "5",
        "name": "XI",
        "type": "input",
        "description": "Crystal oscillator input for 8MHz clock generation."
      },
      {
        "number": "6",
        "name": "XO",
        "type": "output",
        "description": "Crystal oscillator reverse phase output for 8MHz clock generation."
      },
      {
        "number": "7",
        "name": "RESET",
        "type": "input",
        "description": "External reset input, active low, internal pull-up resistor."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground connection to USB bus ground."
      },
      {
        "number": "9",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor."
      },
      {
        "number": "10",
        "name": "CTS1/GPIO2",
        "type": "input",
        "description": "UART1 Clear To Send MODEM input signal, active low; general purpose GPIO2 for input or output."
      },
      {
        "number": "11",
        "name": "RTS1/GPIO3",
        "type": "output",
        "description": "UART1 Request To Send MODEM output signal, active low; general purpose GPIO3 for input or output."
      },
      {
        "number": "12",
        "name": "TXD1",
        "type": "output",
        "description": "UART1 serial data output, idle state high level."
      },
      {
        "number": "13",
        "name": "RXD1",
        "type": "input",
        "description": "UART1 serial data input, internal pull-up resistor."
      },
      {
        "number": "14",
        "name": "ACT",
        "type": "output",
        "description": "USB configuration complete status output, active low."
      },
      {
        "number": "15",
        "name": "DTR1/TNOW1/GPIO9",
        "type": "bidirectional",
        "description": "UART1 Data Terminal Ready MODEM output signal active low; UART1 RS485 transmit/receive control pin; general purpose GPIO9 for input or output."
      },
      {
        "number": "16",
        "name": "TXD6",
        "type": "output",
        "description": "UART6 serial data output, idle state high level."
      },
      {
        "number": "17",
        "name": "RXD6",
        "type": "input",
        "description": "UART6 serial data input, internal pull-up resistor."
      },
      {
        "number": "18",
        "name": "TXD3",
        "type": "output",
        "description": "UART3 serial data output, idle state high level."
      },
      {
        "number": "19",
        "name": "RXD3",
        "type": "input",
        "description": "UART3 serial data input, internal pull-up resistor."
      },
      {
        "number": "20",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground connection to USB bus ground."
      },
      {
        "number": "21",
        "name": "TXD2",
        "type": "output",
        "description": "UART2 serial data output, idle state high level."
      },
      {
        "number": "22",
        "name": "RXD2",
        "type": "input",
        "description": "UART2 serial data input, internal pull-up resistor, 5V tolerant."
      },
      {
        "number": "23",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground connection to USB bus ground."
      },
      {
        "number": "24",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor."
      },
      {
        "number": "25",
        "name": "CTS3/GPIO6",
        "type": "input",
        "description": "UART3 Clear To Send MODEM input signal active low, 5V tolerant; general purpose GPIO6 for input or output."
      },
      {
        "number": "26",
        "name": "CTS2/GPIO4",
        "type": "input",
        "description": "UART2 Clear To Send MODEM input signal active low, 5V tolerant; general purpose GPIO4 for input or output."
      },
      {
        "number": "27",
        "name": "RTS2/GPIO5",
        "type": "output",
        "description": "UART2 Request To Send MODEM output signal, active low; general purpose GPIO5 for input or output."
      },
      {
        "number": "28",
        "name": "RTS3/GPIO7",
        "type": "output",
        "description": "UART3 Request To Send MODEM output signal, active low; general purpose GPIO7 for input or output."
      },
      {
        "number": "29",
        "name": "DTR2/TNOW2/GPIO10",
        "type": "bidirectional",
        "description": "UART2 Data Terminal Ready MODEM output signal active low; UART2 RS485 transmit/receive control pin; 5V tolerant; general purpose GPIO10 for input or output."
      },
      {
        "number": "30",
        "name": "TXD0",
        "type": "output",
        "description": "UART0 serial data output, idle state high level."
      },
      {
        "number": "31",
        "name": "RXD0",
        "type": "input",
        "description": "UART0 serial data input, internal pull-up resistor, 5V tolerant."
      },
      {
        "number": "32",
        "name": "CTS0/GPIO0",
        "type": "input",
        "description": "UART0 Clear To Send MODEM input signal active low, 5V tolerant; general purpose GPIO0 for input or output."
      },
      {
        "number": "33",
        "name": "RTS0/GPIO1",
        "type": "output",
        "description": "UART0 Request To Send MODEM output signal, active low; external pull-down on this pin during power-up disables internal EEPROM configuration and enables default parameters; general purpose GPIO1 for input or output."
      },
      {
        "number": "34",
        "name": "DTR0/TNOW0/GPIO8",
        "type": "bidirectional",
        "description": "UART0 Data Terminal Ready MODEM output signal active low; UART0 RS485 transmit/receive control pin; 5V tolerant; general purpose GPIO8 for input or output."
      },
      {
        "number": "35",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground connection to USB bus ground."
      },
      {
        "number": "36",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor."
      },
      {
        "number": "37",
        "name": "TXD7",
        "type": "output",
        "description": "UART7 serial data output, idle state high level."
      },
      {
        "number": "38",
        "name": "RXD7",
        "type": "input",
        "description": "UART7 serial data input, internal pull-up resistor, 5V tolerant."
      },
      {
        "number": "39",
        "name": "DTR3/TNOW3/GPIO11",
        "type": "bidirectional",
        "description": "UART3 Data Terminal Ready MODEM output signal active low; UART3 RS485 transmit/receive control pin; 5V tolerant; general purpose GPIO11 for input or output."
      },
      {
        "number": "40",
        "name": "TXD4",
        "type": "output",
        "description": "UART4 serial data output, idle state high level."
      },
      {
        "number": "41",
        "name": "RXD4",
        "type": "input",
        "description": "UART4 serial data input, internal pull-up resistor, 5V tolerant."
      },
      {
        "number": "42",
        "name": "UD-",
        "type": "passive",
        "description": "USB bus D- differential data signal, direct connection to USB connector without series resistor."
      },
      {
        "number": "43",
        "name": "UD+",
        "type": "passive",
        "description": "USB bus D+ differential data signal, direct connection to USB connector without series resistor."
      },
      {
        "number": "44",
        "name": "TEST",
        "type": "input",
        "description": "Internal test pin, recommend connecting 4.7kΩ pull-down resistor to ground or direct ground connection."
      },
      {
        "number": "45",
        "name": "TXD5",
        "type": "output",
        "description": "UART5 serial data output, idle state high level."
      },
      {
        "number": "46",
        "name": "RXD5",
        "type": "input",
        "description": "UART5 serial data input, internal pull-up resistor."
      },
      {
        "number": "47",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground connection to USB bus ground."
      },
      {
        "number": "48",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.2",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.2",
        "primary_model": "claude-haiku-4-5-20251001",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-4-6",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [],
        "pages_sent": 9,
        "cost_usd": 0.5808,
        "at": "2026-09-17T21:54:34"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589040309539901440",
        "pages": 9,
        "sha256": "df5440c74e6a0dfe",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 48,
        "described": 48,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ch348q.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9,
          9,
          1.5
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "9dea352d93177c2904afd7d7b68ea8855ce1ab691f69f8b3e13655600514b6bf",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ch348q-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9,
          9,
          1.5
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "3cd7853baa1ea614c9627d1958c28ea314a84a991cae783708ff8a7df17bb88b",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "WCH Jiangsu Qin Heng",
      "Package": "LQFP-48(7x7)",
      "Category": "Interface",
      "Pins": "48"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ch348q"
  ],
  "discovery_pitch": "CH348Q (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",
    "ch348q.kicad_sym",
    "ch348q.kicad_mod",
    "ch348q.glb",
    "ch348q.step",
    "ch348q.lbr",
    "docs/hero.png",
    "docs/ch348q-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T19:00:44.828Z"
}