CH9350L

{
  "schema_version": 1,
  "type": "component",
  "slug": "ch9350l",
  "title": "CH9350L",
  "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",
    "ch9350l",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "CH9350L",
    "manufacturer": "WCH Jiangsu Qin Heng",
    "package": "LQFP-48(7x7)",
    "pin_count": 48,
    "category": "Interface",
    "subcategory": "USB Converters",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8618867676181639168",
    "parts": {
      "symbol": "ch9350l.kicad_sym",
      "footprint": "ch9350l.kicad_mod",
      "model_3d": "ch9350l-hero.glb",
      "model_3d_plain": "ch9350l-etched.glb",
      "model_3d_step": "ch9350l-etched.step",
      "model_3d_step_plain": "ch9350l.step",
      "lbr": "ch9350l.lbr"
    },
    "distributor_links": {
      "lcsc": "C109472"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T19:24:18Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "LED1",
        "type": "output",
        "description": "Port 1 (DP/DM) device connection and communication indicator, high by default and driven low once the device is enumerated (lower-machine mode) or the host is initialized (upper-machine mode), 3.3V output level."
      },
      {
        "number": "2",
        "name": "LED2",
        "type": "output",
        "description": "Port 2 (HP/HM) device connection and communication indicator, high by default and driven low once the device is enumerated or the host is initialized, 3.3V output level."
      },
      {
        "number": "3",
        "name": "RST",
        "type": "input",
        "description": "External reset input, active high; a high pulse of about 100ns typical resets the chip."
      },
      {
        "number": "4",
        "name": "S0",
        "type": "input",
        "description": "Work-state configuration pin (with S1), input with internal pull-up; S1|S0 = 11 selects state 0/1 (default), 10 state 2, 01 state 3, 00 state 4."
      },
      {
        "number": "5",
        "name": "S1",
        "type": "input",
        "description": "Work-state configuration pin (with S0), input with internal pull-up; see S0 for the state-selection truth table."
      },
      {
        "number": "6",
        "name": "xOSC",
        "type": "input",
        "description": "External clock enable pin, active low; when enabled, an external 12 MHz clock must be supplied."
      },
      {
        "number": "7",
        "name": "DEBUG",
        "type": "output",
        "description": "Reserved test pin; leave unconnected."
      },
      {
        "number": "8",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "9",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "10",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "11",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "12",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "13",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "14",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "15",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "16",
        "name": "XI",
        "type": "passive",
        "description": "Reserved crystal oscillator input; leave floating or use the reserved pad, as the datasheet says it is not needed since the chip has an internal clock."
      },
      {
        "number": "17",
        "name": "XO",
        "type": "passive",
        "description": "Reserved crystal oscillator inverting output; leave floating."
      },
      {
        "number": "18",
        "name": "VSS/GND",
        "type": "power_in",
        "description": "Common ground for the device."
      },
      {
        "number": "19",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "20",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "21",
        "name": "IO1",
        "type": "bidirectional",
        "description": "Status synchronization pin; output in upper-machine mode (state 1) and input in lower-machine mode, following the IO1/IO2 pairing rule."
      },
      {
        "number": "22",
        "name": "IO2",
        "type": "bidirectional",
        "description": "Status synchronization pin; input in lower-machine mode and output in upper-machine mode, paired with IO1."
      },
      {
        "number": "23",
        "name": "IO3",
        "type": "bidirectional",
        "description": "Status synchronization pin; input in upper-machine mode and output in lower-machine mode (state 1 only), paired with IO4."
      },
      {
        "number": "24",
        "name": "IO4",
        "type": "bidirectional",
        "description": "Status synchronization pin; input in upper-machine mode and output in lower-machine mode (state 1 only), paired with IO3."
      },
      {
        "number": "25",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "26",
        "name": "TNOW",
        "type": "output",
        "description": "Send-status output pin that can be used for RS-485 transmit direction control."
      },
      {
        "number": "27",
        "name": "RXD",
        "type": "input",
        "description": "UART data input (serial receive)."
      },
      {
        "number": "28",
        "name": "TXD",
        "type": "output",
        "description": "UART data output (serial transmit); the default baud rate is 115200 bps, 8 data bits, 1 stop bit, no parity."
      },
      {
        "number": "29",
        "name": "HP",
        "type": "bidirectional",
        "description": "USB D+ data line for port 2, used in lower-machine mode to connect a USB keyboard or mouse."
      },
      {
        "number": "30",
        "name": "HM",
        "type": "bidirectional",
        "description": "USB D- data line for port 2, used in lower-machine mode to connect a USB keyboard or mouse."
      },
      {
        "number": "31",
        "name": "DP",
        "type": "bidirectional",
        "description": "USB D+ data line for port 1; connects to the USB host in upper-machine mode and to a keyboard/mouse in lower-machine mode."
      },
      {
        "number": "32",
        "name": "DM",
        "type": "bidirectional",
        "description": "USB D- data line; connects to the USB host as the D+/D- device side in upper-machine mode."
      },
      {
        "number": "33",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "34",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "35",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "36",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "37",
        "name": "BAUD1",
        "type": "input",
        "description": "Baud-rate configuration pin 1 with internal pull-up; together with BAUD0 selects 115200 (default), 57600, 38400 or 300000 bps."
      },
      {
        "number": "38",
        "name": "BAUD0",
        "type": "input",
        "description": "Baud-rate configuration pin 0 with internal pull-up; together with BAUD1 selects the UART baud rate."
      },
      {
        "number": "39",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "40",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "41",
        "name": "VIN5",
        "type": "power_in",
        "description": "External 5V supply input to the internal 5V-to-3.3V regulator; requires a 0.1uF decoupling capacitor. Absolute maximum 5.6V."
      },
      {
        "number": "42",
        "name": "VDD33",
        "type": "power_out",
        "description": "Internal regulator output and 3.3V internal supply input; connect to VIN5 when the supply is below 3.6V, otherwise add a 3.3uF decoupling capacitor."
      },
      {
        "number": "43",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "44",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "45",
        "name": "SEL",
        "type": "input",
        "description": "Operating-mode select with internal pull-up: high selects lower-machine mode (default), low selects upper-machine mode; must not exceed 3.6V."
      },
      {
        "number": "46",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "47",
        "name": "NC",
        "type": "unconnected",
        "description": "Reserved pin, must be left unconnected."
      },
      {
        "number": "48",
        "name": "LED0",
        "type": "output",
        "description": "Status indicator pin, high by default; low in upper-machine mode until communication with the PC succeeds, 3.3V output level."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet lists XI and XO with no electrical type ('-') and says they are reserved and should be; VDD33 is both the regulator output and the 3.3V supply input depending on the application; 'power_ou; IO1-IO4 change direction with the operating mode (input or output depending on upper/lower machine m",
          "2/48 pins cited to the wrong page (name found elsewhere): ['16:XI@p4', '17:XO@p4']"
        ],
        "pages_sent": 16,
        "cost_usd": 0.1023,
        "at": "2026-10-18T19:23:58"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8618867676181639168",
        "pages": 16,
        "sha256": "a76d148e4eb701d2",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 48,
        "described": 48,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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      "footprint": "viewers/footprint.html"
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        "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": "9dea352d93177c2904afd7d7b68ea8855ce1ab691f69f8b3e13655600514b6bf",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ch9350l-etched.step",
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        "sha256": "5b4bfb373863581d953b7f589ff4ba4899901e1bd1a5477bd4e2f4af93c8d77a",
        "checked": "2026-10-18",
        "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"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "a76d148e4eb701d29cb403dc00866b3fca4a36b17879e218b36ba7c27bbee917",
      "rows": [
        {
          "name": "Operating ambient temperature",
          "symbol": "TA",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "VIN5=5V or VIN5=VDD33=3.3V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Storage ambient temperature",
          "symbol": "TS",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -55,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Internal operating supply voltage (VDD33)",
          "symbol": "VDD33",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.4,
          "typ": null,
          "max": 3.6,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "External input supply voltage (VIN5)",
          "symbol": "VIN5",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.4,
          "typ": null,
          "max": 5.6,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "External input supply voltage (VIN5), VDD33 pin only externally capacitor-decoupled",
          "symbol": "VIN5",
          "kind": "electrical",
          "unit": "V",
          "min": 3.6,
          "typ": 5,
          "max": 5.5,
          "conditions": "TA=25℃, VIN5=5V; excludes USB bus pins; VDD33 pin only external capacitor",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "External input supply voltage (VIN5), VDD33 pin connected to VIN5",
          "symbol": "VIN5",
          "kind": "electrical",
          "unit": "V",
          "min": 3,
          "typ": 3.3,
          "max": 3.6,
          "conditions": "TA=25℃, VIN5=5V; excludes USB bus pins; VDD33 pin connected to VIN5",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Low-level input voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": -0.4,
          "typ": null,
          "max": 0.8,
          "conditions": "TA=25℃, VIN5=5V; excludes USB bus pins",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "High-level input voltage (max printed as VDD33+0.4 V, not a number)",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "TA=25℃, VIN5=5V; excludes USB bus pins",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Low-level output voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.4,
          "conditions": "4mA sink current; TA=25℃, VIN5=5V; excludes USB bus pins",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Power-on reset voltage threshold",
          "symbol": "Vpot",
          "kind": "electrical",
          "unit": "V",
          "min": 2.2,
          "typ": 2.4,
          "max": 2.5,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "SEL input voltage (must not exceed)",
          "symbol": "SEL",
          "kind": "recommended_operating",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 3.6,
          "conditions": "SEL pin input voltage",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "External reset (RST) active high pulse width",
          "symbol": "RST",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 100,
          "max": null,
          "conditions": "RST high level; effective reset pulse width",
          "source_page": 7,
          "source": "datasheet"
        }
      ]
    }
  },
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  "discovery_pitch": "CH9350L (WCH Jiangsu Qin Heng) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
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