CH341T

{
  "schema_version": 1,
  "type": "component",
  "slug": "ch341t",
  "title": "CH341T",
  "brief": "WCH Jiangsu Qin Heng USB Converters, SSOP-20-208mil. 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",
    "ch341t",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "CH341T",
    "manufacturer": "WCH Jiangsu Qin Heng",
    "package": "SSOP-20-208mil",
    "pin_count": 20,
    "category": "Interface",
    "subcategory": "USB Converters",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757222064967299072",
    "parts": {
      "symbol": "ch341t.kicad_sym",
      "footprint": "ch341t.kicad_mod",
      "model_3d": "ch341t-hero.glb",
      "model_3d_plain": "ch341t-etched.glb",
      "model_3d_step": "ch341t-etched.step",
      "model_3d_step_plain": "ch341t.step",
      "lbr": "ch341t.lbr"
    },
    "distributor_links": {
      "lcsc": "C23971"
    },
    "distributor_check": {
      "checked_at": "2026-10-19T03:49:32Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "ACT#",
        "type": "output",
        "description": "USB device configuration status output, active low: high until the USB device is configured, low once configured; it may drive an LED through a series current-limiting resistor."
      },
      {
        "number": "2",
        "name": "ROV#",
        "type": "tri_state",
        "description": "Serial receive buffer overflow indicator, active low; it should stay high in normal operation because the internal receive buffer does not normally overflow."
      },
      {
        "number": "3",
        "name": "TXD",
        "type": "output",
        "description": "Asynchronous serial data output; the line idles high."
      },
      {
        "number": "4",
        "name": "RXD",
        "type": "input",
        "description": "Asynchronous serial data input with internal pull-up resistor; the line idles high."
      },
      {
        "number": "5",
        "name": "INT#",
        "type": "input",
        "description": "Custom interrupt request input with internal pull-up resistor, active on rising edge; a detected rising edge notifies the host computer."
      },
      {
        "number": "6",
        "name": "V3",
        "type": "power_in",
        "description": "Supply pin: connect to VCC for 3.3V operation, or decouple with a 0.01uF to 0.1uF capacitor when operating at 5V."
      },
      {
        "number": "7",
        "name": "UD+",
        "type": "bidirectional",
        "description": "Connects directly to the USB bus D+ data line; the USB pull-up resistor is built into the chip."
      },
      {
        "number": "8",
        "name": "UD-",
        "type": "bidirectional",
        "description": "Connects directly to the USB bus D- data line."
      },
      {
        "number": "9",
        "name": "XI",
        "type": "input",
        "description": "Crystal oscillator input; the CH341T requires an external 12MHz crystal with load capacitors to XI and XO."
      },
      {
        "number": "10",
        "name": "XO",
        "type": "output",
        "description": "Inverted crystal oscillator output; the CH341T requires an external 12MHz crystal with load capacitor to ground."
      },
      {
        "number": "11",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground, connected directly to the USB bus ground; multiple GND pins are paralleled internally."
      },
      {
        "number": "12",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground, connected directly to the USB bus ground; multiple GND pins are paralleled internally."
      },
      {
        "number": "13",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply input with a 0.1uF decoupling capacitor; 4.0 to 5.5 V with V3 unconnected, or 3.0 to 3.6 V with V3 tied to VCC."
      },
      {
        "number": "14",
        "name": "SLP#",
        "type": "tri_state",
        "description": "Sleep state output, active low."
      },
      {
        "number": "15",
        "name": "SDA",
        "type": "bidirectional",
        "description": "Two-wire serial data line (open-drain output and input) with internal pull-up, used for function configuration from an external serial EEPROM."
      },
      {
        "number": "16",
        "name": "SCL",
        "type": "output",
        "description": "Two-wire serial clock line (open-drain output) with internal pull-up, used for function configuration from an external serial EEPROM."
      },
      {
        "number": "17",
        "name": "RDY#",
        "type": "output",
        "description": "Serial receive ready output, active low; high means the chip is not yet ready to receive data (reset, USB not configured, or receive buffer full)."
      },
      {
        "number": "18",
        "name": "TNOW",
        "type": "output",
        "description": "High while the chip is transmitting serial data from the serial port and low after transmission completes."
      },
      {
        "number": "19",
        "name": "TEN#",
        "type": "input",
        "description": "Serial transmit enable input with internal pull-up, active low; when driven high the chip pauses serial transmission until it returns low."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply input with a 0.1uF decoupling capacitor; 4.0 to 5.5 V with V3 unconnected, or 3.0 to 3.6 V with V3 tied to VCC."
      }
    ],
    "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: Section 4.2 of the Chinese datasheet prints six column headers (341B/341A/341F/341C/341T/341H) over ; Pins 2-5, 14, 17-19 (TXD, RXD, ROV#, INT#, SLP#, RDY#, TNOW, TEN#) are taken from the 341C/T column ; The pin table gives no RSTI pin for the SSOP-20 variant and no CTS#, DSR#, RI#, DCD#, DTR#, RTS#, OU",
          "1/20 pins cited to the wrong page (name found elsewhere): ['10:XO@p3']",
          "1/20 pin names appear NOWHERE in the datasheet text: ['9:XI@p3']"
        ],
        "pages_sent": 12,
        "cost_usd": 0.1,
        "at": "2026-10-19T03:47:56"
      },
      "datasheet": {
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        "pages": 12,
        "sha256": "8f76a55cf6fbe6fe",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "c9a01a276d0b4d9561efd58f2fcee56f52c1b6ab464ea7a0380cab4e87a924e6",
        "checked": "2026-10-19",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "WCH Jiangsu Qin Heng",
      "Package": "SSOP-20-208mil",
      "Category": "Interface",
      "Pins": "20"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "8f76a55cf6fbe6fe9ace90a2f249132acca4ad6d555f93ffc1e775e5fef083a9",
      "rows": [
        {
          "name": "Operating ambient temperature (external clock)",
          "symbol": "TA",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "CH341B/F/C/A/T/H chip, external clock",
          "source_page": 8,
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        },
        {
          "name": "Storage ambient temperature",
          "symbol": "TS",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -55,
          "typ": null,
          "max": 100,
          "conditions": "",
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        },
        {
          "name": "Supply voltage (VCC to power, GND to ground)",
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        {
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        },
        {
          "name": "Supply voltage (V3 pin not connected to VCC)",
          "symbol": "VCC",
          "kind": "electrical",
          "unit": "V",
          "min": 4,
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          "max": 5.5,
          "conditions": "V3 pin not connected to VCC pin",
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        {
          "name": "Supply voltage (V3 connected to VCC, external clock)",
          "symbol": "VCC",
          "kind": "electrical",
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          "min": 3,
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          "max": 3.6,
          "conditions": "V3 pin connected to VCC pin, external clock",
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        },
        {
          "name": "Operating total supply current",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 12,
          "max": 30,
          "conditions": "CH341A/T/H chip, VCC=5V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "USB suspend total supply current",
          "symbol": "ISLP",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
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          "max": 0.25,
          "conditions": "VCC=5V",
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          "source": "datasheet"
        },
        {
          "name": "USB suspend total supply current",
          "symbol": "ISLP",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.04,
          "max": 0.12,
          "conditions": "VCC=3.3V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Low-level input voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 0.7,
          "conditions": "",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "High-level input voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Low-level output voltage",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.5,
          "conditions": "5mA 吸入电流 (5mA sink current)",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "High-level output current of SCL and SDA pins",
          "symbol": "IUPs",
          "kind": "electrical",
          "unit": "uA",
          "min": 100,
          "typ": 200,
          "max": 500,
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          "source_page": 8,
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        },
        {
          "name": "Input current of built-in pull-up resistor input",
          "symbol": "IUP",
          "kind": "electrical",
          "unit": "uA",
          "min": 3,
          "typ": 120,
          "max": 250,
          "conditions": "",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Input current of built-in pull-down resistor input",
          "symbol": "IDN",
          "kind": "electrical",
          "unit": "uA",
          "min": -40,
          "typ": -100,
          "max": -250,
          "conditions": "",
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        },
        {
          "name": "Power-on reset voltage threshold",
          "symbol": "VR",
          "kind": "electrical",
          "unit": "V",
          "min": 2.1,
          "typ": 2.6,
          "max": 2.8,
          "conditions": "",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "XI input clock signal frequency",
          "symbol": "FCLK",
          "kind": "timing",
          "unit": "MHz",
          "min": 11.98,
          "typ": 12,
          "max": 12.02,
          "conditions": "",
          "source_page": 8,
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        },
        {
          "name": "Power-on reset time",
          "symbol": "TPR",
          "kind": "timing",
          "unit": "mS",
          "min": 9,
          "typ": 20,
          "max": 40,
          "conditions": "",
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        },
        {
          "name": "External reset input active signal width",
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          "unit": "nS",
          "min": 100,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 8,
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        },
        {
          "name": "Reset delay after external reset input",
          "symbol": "TRD",
          "kind": "timing",
          "unit": "mS",
          "min": null,
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      ]
    }
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