AT42QT2120-SUR

{
  "schema_version": 1,
  "type": "component",
  "slug": "at42qt2120-sur",
  "title": "AT42QT2120-SUR",
  "brief": "Microchip Tech Touch Sensors, SOIC-20-300mil. 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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    "sensors",
    "at42qt2120-sur",
    "factory-2.0.0",
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  "component": {
    "mpn": "AT42QT2120-SUR",
    "manufacturer": "Microchip Tech",
    "package": "SOIC-20-300mil",
    "pin_count": 20,
    "category": "Sensors",
    "subcategory": "Touch Sensors",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588939666275897344",
    "parts": {
      "symbol": "at42qt2120-sur.kicad_sym",
      "footprint": "at42qt2120-sur.kicad_mod",
      "model_3d": "at42qt2120-sur-hero.glb",
      "model_3d_plain": "at42qt2120-sur-etched.glb",
      "model_3d_step": "at42qt2120-sur-etched.step",
      "model_3d_step_plain": "at42qt2120-sur.step",
      "lbr": "at42qt2120-sur.lbr"
    },
    "distributor_links": {
      "lcsc": "C614938",
      "digikey": "AT42QT2120-SURTR-ND"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T21:41:10Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "AT42QT2120-SURTR-ND",
        "status": "found"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "KEY8/GPO6",
        "type": "bidirectional",
        "description": "Comms mode: touch key 8 or general-purpose output GPO6; standalone mode: push-pull output for key 3; leave open if unused."
      },
      {
        "number": "2",
        "name": "KEY7/GPO5",
        "type": "bidirectional",
        "description": "Comms mode: touch key 7 or general-purpose output GPO5; standalone mode: push-pull output for key 2; leave open if unused."
      },
      {
        "number": "3",
        "name": "KEY6/GPO4",
        "type": "bidirectional",
        "description": "Comms mode: touch key 6 or general-purpose output GPO4; standalone mode: touch key 6; leave open if unused."
      },
      {
        "number": "4",
        "name": "KEY5/GPO3",
        "type": "bidirectional",
        "description": "Comms mode: touch key 5 or general-purpose output GPO3; standalone mode: touch key 5; leave open if unused."
      },
      {
        "number": "5",
        "name": "KEY4/GPO2",
        "type": "bidirectional",
        "description": "Comms mode: touch key 4 or general-purpose output GPO2; standalone mode: touch key 4; leave open if unused."
      },
      {
        "number": "6",
        "name": "KEY3/GPO1",
        "type": "bidirectional",
        "description": "Comms mode: touch key 3 or general-purpose output GPO1; standalone mode: touch key 3; leave open if unused."
      },
      {
        "number": "7",
        "name": "KEY2/GPO0",
        "type": "bidirectional",
        "description": "Comms mode: key/slider/wheel 2 or general-purpose output GPO0; standalone mode: touch key 2; leave open if unused."
      },
      {
        "number": "8",
        "name": "KEY1",
        "type": "bidirectional",
        "description": "Comms mode: key/slider/wheel 1; standalone mode: guard channel; leave open if unused."
      },
      {
        "number": "9",
        "name": "KEY0",
        "type": "bidirectional",
        "description": "Comms mode: key/slider/wheel 0; standalone mode: proximity channel; leave open if unused."
      },
      {
        "number": "10",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground reference for the device."
      },
      {
        "number": "11",
        "name": "VDD",
        "type": "power_in",
        "description": "Supply pin; the device operates from 1.8 V to 5.5 V as stated in the features list."
      },
      {
        "number": "12",
        "name": "MODE",
        "type": "input",
        "description": "Mode selection pin: connect to VSS for comms mode or to VDD for standalone mode."
      },
      {
        "number": "13",
        "name": "SDA",
        "type": "bidirectional",
        "description": "Comms mode: I2C serial interface data as an open-drain line that must be pulled up to VDD; in standalone mode it is unused and should be pulled up to VDD."
      },
      {
        "number": "14",
        "name": "RESET",
        "type": "input",
        "description": "Active-low reset with an internal 60 kΩ pull-up; tie to VDD if not used."
      },
      {
        "number": "15",
        "name": "N/C",
        "type": "output",
        "description": "Comms mode: no connection; standalone mode: open-drain output for the proximity channel, leave open if unused."
      },
      {
        "number": "16",
        "name": "SCL",
        "type": "bidirectional",
        "description": "Comms mode: I2C serial interface clock as an open-drain line that must be pulled up to VDD; in standalone mode it is unused and should be pulled up to VDD."
      },
      {
        "number": "17",
        "name": "CHANGE",
        "type": "output",
        "description": "Comms mode: active-low state-change interrupt open-drain output requiring an external pull-up resistor; in standalone mode it is unused and should be pulled up to VDD."
      },
      {
        "number": "18",
        "name": "KEY11/GPO9",
        "type": "bidirectional",
        "description": "Comms mode: touch key 11 or general-purpose output GPO9; standalone mode: push-pull output for key 6; leave open if unused."
      },
      {
        "number": "19",
        "name": "KEY10/GPO8",
        "type": "bidirectional",
        "description": "Comms mode: touch key 10 or general-purpose output GPO8; standalone mode: push-pull output for key 5; leave open if unused."
      },
      {
        "number": "20",
        "name": "KEY9/GPO7",
        "type": "bidirectional",
        "description": "Comms mode: touch key 9 or general-purpose output GPO7; standalone mode: push-pull output for key 4; leave open if unused."
      }
    ],
    "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 300 mil body width is not stated anywhere in the supplied pages. The pinout is given only as '20; The -SUR suffix is not explained in the supplied text. The SOIC variant was identified from the mark; The datasheet names two pin functions for each pin, one for comms mode and one for standalone mode. "
        ],
        "pages_sent": 13,
        "cost_usd": 0.0581,
        "at": "2026-10-18T21:40:53"
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      "datasheet": {
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        "pages": 46,
        "sha256": "1302c88dd32f1df3",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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      "symbol": "viewers/symbol.html",
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          10.3,
          12.8,
          2.75
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "59a10b341e6972b31d81802a048060326da627d8b92dcf4263064f4f62ec808e",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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        "sha256": "60205d8b2480da7b515d1a4be78795772908e293df45b48cb5d51b12212401f8",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "SOIC-20-300mil",
      "Category": "Sensors",
      "Pins": "20"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "1302c88dd32f1df3de8cb2b32c868a132ba88896fad3836312c4ae43e3d4adde",
      "rows": [
        {
          "name": "Supply voltage Vdd (absolute maximum)",
          "symbol": "Vdd",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 6,
          "conditions": "",
          "source_page": 30,
          "source": "datasheet"
        },
        {
          "name": "Max continuous pin current, any control or drive pin",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -10,
          "typ": null,
          "max": 10,
          "conditions": "any control or drive pin",
          "source_page": 30,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 30,
          "source": "datasheet"
        },
        {
          "name": "Operating temperature",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "",
          "source_page": 30,
          "source": "datasheet"
        },
        {
          "name": "Supply voltage Vdd",
          "symbol": "Vdd",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.8,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 30,
          "source": "datasheet"
        },
        {
          "name": "Supply ripple+noise",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "mV",
          "min": -25,
          "typ": null,
          "max": 25,
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        },
        {
          "name": "Cx load capacitance per key",
          "symbol": "Cx",
          "kind": "recommended_operating",
          "unit": "pF",
          "min": 1,
          "typ": null,
          "max": 30,
          "conditions": "",
          "source_page": 30,
          "source": "datasheet"
        },
        {
          "name": "Low output voltage",
          "symbol": "Vol",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.6,
          "conditions": "Vdd = 3.3 V, Cs = 10 nF, load = 5 pF, 32 ms default sleep, Ta = recommended range",
          "source_page": 30,
          "source": "datasheet"
        },
        {
          "name": "Input leakage current",
          "symbol": "Iil",
          "kind": "electrical",
          "unit": "µA",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "Vdd = 3.3 V, Cs = 10 nF, load = 5 pF, 32 ms default sleep, Ta = recommended range",
          "source_page": 30,
          "source": "datasheet"
        },
        {
          "name": "Sample frequency",
          "symbol": "FQT",
          "kind": "timing",
          "unit": "kHz",
          "min": 10.5,
          "typ": 12.5,
          "max": null,
          "conditions": "Modulated spread-spectrum (chirp)",
          "source_page": 31,
          "source": "datasheet"
        },
        {
          "name": "Burst modulation, percentage",
          "symbol": "Fm",
          "kind": "timing",
          "unit": "%",
          "min": 15,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 31,
          "source": "datasheet"
        },
        {
          "name": "I2C-compatible clock rate",
          "symbol": "FI2C",
          "kind": "timing",
          "unit": "kHz",
          "min": null,
          "typ": null,
          "max": 400,
          "conditions": "",
          "source_page": 31,
          "source": "datasheet"
        },
        {
          "name": "RESET pulse width",
          "symbol": "",
          "kind": "timing",
          "unit": "µs",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "2 µs at 1.8 V",
          "source_page": 31,
          "source": "datasheet"
        },
        {
          "name": "Power-up delay to operate/calibration time",
          "symbol": "TD",
          "kind": "timing",
          "unit": "ms",
          "min": null,
          "typ": 230,
          "max": null,
          "conditions": "Printed as <230 ms in the Typical column; can be longer if burst is very long",
          "source_page": 31,
          "source": "datasheet"
        }
      ]
    }
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  "discovery_pitch": "AT42QT2120-SUR (Microchip Tech) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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