CH343P

{
  "schema_version": 1,
  "type": "component",
  "slug": "ch343p",
  "title": "CH343P",
  "brief": "WCH Jiangsu Qin Heng USB Converters, TQFN-16-EP(3x3). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "ch343p"
  ],
  "component": {
    "mpn": "CH343P",
    "manufacturer": "WCH Jiangsu Qin Heng",
    "package": "TQFN-16-EP(3x3)",
    "pin_count": 17,
    "category": "Interface",
    "subcategory": "USB Converters",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/60ab625effae247ff0bd8e1f7ad25257.pdf",
    "parts": {
      "symbol": "ch343p.kicad_sym",
      "footprint": "ch343p.kicad_mod",
      "model_3d": "ch343p-etched.glb",
      "model_3d_plain": "ch343p.glb",
      "model_3d_step": "ch343p-etched.step",
      "model_3d_step_plain": "ch343p.step",
      "lbr": "ch343p.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "VIO",
        "type": "power_in",
        "description": "I/O port power supply input for UART and RST pins. Supports 1.8V-5.5V; should share the supply used by the connected MCU. Requires an external decoupling capacitor. Not fed by V3/VDD5 internally and no reverse current path."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground. Must be connected to the USB bus ground. Pin 0 (exposed pad on the underside of the QFN) is also GND and is optional but recommended for connection."
      },
      {
        "number": "3",
        "name": "VDD5",
        "type": "power_in",
        "description": "Positive supply input to the internal 3.3V LDO regulator. Accepts 4.0-5.5V when V3 is not tied to VDD5, or 3.0-3.6V when V3 is tied to VDD5. Requires an external decoupling capacitor."
      },
      {
        "number": "4",
        "name": "TXD",
        "type": "output",
        "description": "UART serial data output. Idle state is high. Referenced to VIO."
      },
      {
        "number": "5",
        "name": "RXD",
        "type": "input",
        "description": "UART serial data input with an internal pull-up to VIO (typ. ~60 uA at 3.3V). Idle state is high."
      },
      {
        "number": "6",
        "name": "V3",
        "type": "power_in",
        "description": "Internal 3.3V LDO regulator output and core/USB PHY supply input. When VDD5 < 3.6V, tie V3 to VDD5 and feed 3.3V externally; when VDD5 > 3.6V, leave V3 with only its decoupling capacitor (0.1 uF). LDO drive capability ~10 mA."
      },
      {
        "number": "7",
        "name": "UD+",
        "type": "bidirectional",
        "description": "USB D+ data line. Connect directly to the USB bus D+; no series resistor allowed (internal USB transceiver/1.5K pull-up per USB 2.0 full-speed)."
      },
      {
        "number": "8",
        "name": "UD-",
        "type": "bidirectional",
        "description": "USB D- data line. Connect directly to the USB bus D-; no series resistor allowed."
      },
      {
        "number": "9",
        "name": "VBUS",
        "type": "input",
        "description": "USB bus VBUS presence detection input with internal pull-down (controllable via MCR OUT1 to close/open the pull-down). Also supports the VIO low-voltage protection scheme when a series resistor + external PMOS is used to switch VIO. Abs max 6.5V."
      },
      {
        "number": "10",
        "name": "ACT#",
        "type": "output",
        "description": "USB enumeration/configuration-complete status output, active low. Inactive during USB suspend. Typically used to drive an LED (through a series resistor to VIO) or notify the MCU that the USB link is up."
      },
      {
        "number": "11",
        "name": "DCD",
        "type": "input",
        "description": "MODEM handshake input: Data Carrier Detect, active low. Driven by the peer's DCE."
      },
      {
        "number": "12",
        "name": "DTR/TNOW",
        "type": "output",
        "description": "Default: MODEM DTR output, active low. If a ~4.7 kOhm pull-down is detected on this pin at power-up/reset, the pin auto-switches to TNOW (transmit-in-progress indicator, active high) for driving RS485 DE/RE# in half-duplex mode."
      },
      {
        "number": "13",
        "name": "RTS",
        "type": "output",
        "description": "MODEM handshake output: Request To Send, active low. Also used by the hardware auto-flow-control logic (asserted while the RX buffer has room)."
      },
      {
        "number": "14",
        "name": "DSR",
        "type": "input",
        "description": "MODEM handshake input: Data Set Ready, active low. Internal pull-up to VIO."
      },
      {
        "number": "15",
        "name": "CTS",
        "type": "input",
        "description": "MODEM handshake input: Clear To Send, active low. Used by the auto-flow-control logic to gate transmission. Internal pull-up to VIO."
      },
      {
        "number": "16",
        "name": "RI",
        "type": "input",
        "description": "MODEM handshake input: Ring Indicator, active low. Internal pull-up to VIO."
      },
      {
        "number": "0",
        "name": "GND",
        "type": "power_in",
        "description": "Exposed thermal/ground pad on the underside of the QFN16 package. Connection is optional but recommended; ties to the same net as pin 2 GND."
      }
    ],
    "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": 17,
        "described": 17,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "WCH Jiangsu Qin Heng",
      "Package": "TQFN-16-EP(3x3)",
      "Category": "Interface",
      "Pins": "17"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ch343p"
  ],
  "discovery_pitch": "CH343P (WCH Jiangsu Qin Heng) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ch343p.kicad_sym",
    "ch343p.kicad_mod",
    "ch343p.glb",
    "ch343p.step",
    "ch343p-etched.step",
    "ch343p.lbr",
    "docs/hero.png",
    "docs/ch343p-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "CH343P",
      "kind": "packaging"
    },
    {
      "mpn": "CH343G",
      "kind": "unknown"
    },
    {
      "mpn": "CH343C",
      "kind": "unknown"
    },
    {
      "mpn": "CH343K",
      "kind": "unknown"
    }
  ],
  "updated_at": "2026-09-24T19:00:36.418Z"
}