CH340B

{
  "slug": "ch340b",
  "version": "0.1.0",
  "type": "component",
  "description": "WCH Jiangsu Qin Heng USB Converters, SOP-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "interface",
    "ch340b",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ch340b.kicad_sym",
    "ch340b.kicad_mod",
    "ch340b.glb",
    "ch340b.step",
    "ch340b.lbr",
    "docs/hero.png",
    "docs/ch340b-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "component": {
    "mpn": "CH340B",
    "manufacturer": "WCH Jiangsu Qin Heng",
    "package": "SOP-16",
    "pin_count": 16,
    "category": "Interface",
    "subcategory": "USB Converters",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8618867607621410816",
    "parts": {
      "symbol": "ch340b.kicad_sym",
      "footprint": "ch340b.kicad_mod",
      "model_3d": "ch340b.glb",
      "model_3d_step": "ch340b.step",
      "lbr": "ch340b.lbr"
    },
    "distributor_links": {
      "lcsc": "C81010"
    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground, directly connected to USB bus ground line."
      },
      {
        "number": "2",
        "name": "TXD",
        "type": "output",
        "description": "Serial data output with idle state high level for CH340C/N/E/X/B/T."
      },
      {
        "number": "3",
        "name": "RXD",
        "type": "input",
        "description": "Serial data input with built-in controllable pull-up and pull-down resistors."
      },
      {
        "number": "4",
        "name": "V3",
        "type": "power_in",
        "description": "3.3V power supply connection for external power input (3.3V mode) or 0.1µF power decoupling capacitor (5V mode)."
      },
      {
        "number": "5",
        "name": "UD+",
        "type": "bidirectional",
        "description": "Direct connection to USB bus D+ data line, do not add series resistor."
      },
      {
        "number": "6",
        "name": "UD-",
        "type": "bidirectional",
        "description": "Direct connection to USB bus D- data line, do not add series resistor."
      },
      {
        "number": "7",
        "name": "RST#",
        "type": "input",
        "description": "External reset input, active low with internal pull-up resistor (CH340B only)."
      },
      {
        "number": "8",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection, empty pin must be left floating (CH340B only)."
      },
      {
        "number": "9",
        "name": "CTS#",
        "type": "input",
        "description": "MODEM contact input signal for clear to send, active low or high per software definition."
      },
      {
        "number": "10",
        "name": "DSR#",
        "type": "input",
        "description": "MODEM contact input signal for data set ready, active low or high per software definition."
      },
      {
        "number": "11",
        "name": "RI#",
        "type": "input",
        "description": "MODEM contact input signal for ring indicator, active low or high per software definition."
      },
      {
        "number": "12",
        "name": "DCD#",
        "type": "input",
        "description": "MODEM contact input signal for carrier detect, active low or high per software definition."
      },
      {
        "number": "13",
        "name": "DTR#",
        "type": "output",
        "description": "MODEM contact output signal for data terminal ready, active low or high per software definition."
      },
      {
        "number": "14",
        "name": "RTS#",
        "type": "output",
        "description": "MODEM contact output signal for request to send, active low or high per software definition."
      },
      {
        "number": "15",
        "name": "TNOW",
        "type": "output",
        "description": "Serial port transmission in progress status indicator, active high level (CH340T/E/X/B)."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive power supply input, requires external 0.1µF power 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": 10,
        "cost_usd": 0.3155,
        "at": "2026-09-17T18:31:54"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8618867607621410816",
        "pages": 10,
        "sha256": "6a6922d3c4de2d4f",
        "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": "ch340b.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          9.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ch340b-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          9.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "4b3b61d735c186ac65668b3fb0d36c03066f4b9e8101768a9b2ff609757b53cc",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}