CH9328

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  "type": "component",
  "slug": "ch9328",
  "title": "CH9328",
  "brief": "WCH(Jiangsu Qin Heng) USB ICs, SOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "interface ics",
    "ch9328",
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  "component": {
    "mpn": "CH9328",
    "manufacturer": "WCH(Jiangsu Qin Heng)",
    "package": "SOP-16",
    "pin_count": 16,
    "category": "Interface ICs",
    "subcategory": "USB ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/dc1d23e4555441cc5fcfcae0a07deaae.pdf",
    "parts": {
      "symbol": "ch9328.kicad_sym",
      "footprint": "ch9328.kicad_mod",
      "model_3d": "ch9328-hero.glb",
      "model_3d_plain": "ch9328-etched.glb",
      "model_3d_step": "ch9328-etched.step",
      "model_3d_step_plain": "ch9328.step",
      "lbr": "ch9328.lbr"
    },
    "distributor_links": {
      "lcsc": "C82452"
    },
    "distributor_check": {
      "checked_at": "2026-10-22T22:42:18Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "deferred",
        "error": "shared DigiKey quota guard: 942 calls left today"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "RSTI",
        "type": "input",
        "description": "External reset input, active low, with built-in pull-up resistor."
      },
      {
        "number": "2",
        "name": "TXD",
        "type": "output",
        "description": "Invalid pin, not actually used."
      },
      {
        "number": "3",
        "name": "RXD",
        "type": "input",
        "description": "Serial data input with built-in pull-up resistor."
      },
      {
        "number": "4",
        "name": "T_LED",
        "type": "output",
        "description": "Serial UART send status output, active high."
      },
      {
        "number": "5",
        "name": "V3",
        "type": "power_in",
        "description": "Connect to VCC when VCC is 3V3, connect to a 0.1uF decoupling capacitor when VCC is 5V."
      },
      {
        "number": "6",
        "name": "UD+",
        "type": "bidirectional",
        "description": "Connect directly to USB D+ signal."
      },
      {
        "number": "7",
        "name": "UD-",
        "type": "bidirectional",
        "description": "Connect directly to USB D- signal."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "9",
        "name": "XI",
        "type": "input",
        "description": "Crystal oscillator input requiring external crystal and capacitor for chips below V1.4; left suspended for V1.4 and above with integrated oscillator."
      },
      {
        "number": "10",
        "name": "XO",
        "type": "output",
        "description": "Crystal oscillator inverted output requiring external crystal and capacitor for chips below V1.4; left suspended for V1.4 and above with integrated oscillator."
      },
      {
        "number": "11",
        "name": "IO2",
        "type": "bidirectional",
        "description": "User-configurable pin and operating mode configuration pin, level detected after power-on, configurable as GPIO after USB configuration."
      },
      {
        "number": "12",
        "name": "IO1",
        "type": "bidirectional",
        "description": "User-configurable pin and speed configuration pin; high at power-on gives normal speed mode, otherwise high speed mode (about twice normal speed); configurable as GPIO after USB configuration."
      },
      {
        "number": "13",
        "name": "IO4",
        "type": "bidirectional",
        "description": "User-configurable pin and operating mode configuration pin, level detected after power-on, configurable as GPIO after USB configuration."
      },
      {
        "number": "14",
        "name": "IO3",
        "type": "bidirectional",
        "description": "User-configurable pin and operating mode configuration pin, level detected after power-on, configurable as GPIO after USB configuration."
      },
      {
        "number": "15",
        "name": "VCC",
        "type": "power_in",
        "description": "Power supply voltage input (3.0V to 5.3V), requires an external 0.1uF decoupling capacitor."
      },
      {
        "number": "16",
        "name": "ACT#",
        "type": "output",
        "description": "USB configuration completed status output, active low."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Datasheet pin type for TXD is 'Output' but described as invalid/unused; UD+/UD- typed as bidirection; Datasheet lists RSTI as built-in pull-up in pin table but electrical table says pull-down; inconsist"
        ],
        "pages_sent": 6,
        "cost_usd": 0.0713,
        "at": "2026-10-22T22:42:07"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/dc1d23e4555441cc5fcfcae0a07deaae.pdf",
        "pages": 6,
        "sha256": "afe1d515c815d37e",
        "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"
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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        "sha256": "45354280799fe53354da98c51fd3fe06408cbcf5599ff39a0d507e671dbae5a0",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "WCH(Jiangsu Qin Heng)",
      "Package": "SOP-16",
      "Category": "Interface ICs",
      "Pins": "16"
    },
    "appearance": {
      "contacts": {
        "quote": "When designing the PCB, pay attention to: decoupling capacitor C2 and C3 get as close to connected pins of CH9328; making sure D+ and D- signal lines are close to the parallel wiring and providing gro",
        "page": 5,
        "doc": "ds.pdf",
        "material": "copper"
      },
      "version": 1,
      "datasheet_sha256": "afe1d515c815d37e49eed02317108a737829a666a371e9d4cbe487643238b8db"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "afe1d515c815d37e49eed02317108a737829a666a371e9d4cbe487643238b8db",
      "rows": [
        {
          "name": "Operating ambient temperature",
          "symbol": "TA",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Storage ambient temperature",
          "symbol": "TS",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -55,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Supply voltage",
          "symbol": "VCC",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 5.5,
          "conditions": "VCC connects to power, GND to ground",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Voltage of input or output pin",
          "symbol": "VIO",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 5.5,
          "conditions": "Max printed as VCC+0.5",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Supply voltage",
          "symbol": "VCC",
          "kind": "electrical",
          "unit": "V",
          "min": 3,
          "typ": 5,
          "max": 5.3,
          "conditions": "TA=25℃, VCC=5V, exclude pins connected to USB bus",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Static supply current",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 15,
          "max": 30,
          "conditions": "TA=25℃, VCC=5V, exclude pins connected to USB bus",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input low voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 0.8,
          "conditions": "TA=25℃, VCC=5V, exclude pins connected to USB bus",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output low voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.5,
          "conditions": "8mA draw current",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Input current of RXD with built-in pull-up resistor",
          "symbol": "IUPrxd",
          "kind": "electrical",
          "unit": "uA",
          "min": 40,
          "typ": 80,
          "max": 160,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Input current of RSTI with built-in pull-down resistor",
          "symbol": "IDNrst",
          "kind": "electrical",
          "unit": "uA",
          "min": -10,
          "typ": -150,
          "max": -240,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
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  "discovery_triggers": [
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  ],
  "discovery_pitch": "CH9328 (WCH(Jiangsu Qin Heng)) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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  "visibility": {
    "public": true
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}