ATSAMD21G18A-MF

{
  "schema_version": 1,
  "type": "component",
  "slug": "atsamd21g18a-mf",
  "title": "ATSAMD21G18A-MF",
  "brief": "Microchip Tech Pre-ordered MCUs, QFN-48-EP(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",
    "embedded processors & controllers",
    "atsamd21g18a-mf",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "ATSAMD21G18A-MF",
    "manufacturer": "Microchip Tech",
    "package": "QFN-48-EP(7x7)",
    "pin_count": 49,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Pre-ordered MCUs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/d70e0a926271e38a2611b8b6dcc19c07.pdf",
    "parts": {
      "symbol": "atsamd21g18a-mf.kicad_sym",
      "footprint": "atsamd21g18a-mf.kicad_mod",
      "model_3d": "atsamd21g18a-mf-hero.glb",
      "model_3d_plain": "atsamd21g18a-mf-etched.glb",
      "model_3d_step": "atsamd21g18a-mf-etched.step",
      "model_3d_step_plain": "atsamd21g18a-mf.step",
      "lbr": "atsamd21g18a-mf.lbr"
    },
    "distributor_links": {
      "lcsc": "C614475",
      "digikey": "ATSAMD21G18A-MF-ND",
      "mouser": "556-ATSAMD21G18A-MF"
    },
    "distributor_check": {
      "checked_at": "2026-10-23T03:06:21Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "ATSAMD21G18A-MF-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "556-ATSAMD21G18A-MF",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PA00",
        "type": "bidirectional",
        "description": "GPIO on VDDANA supply with EXTINT[0], SERCOM1 PAD[0] and TCC2 WO[0]; also XIN32 for the 32kHz crystal oscillator."
      },
      {
        "number": "2",
        "name": "PA01",
        "type": "bidirectional",
        "description": "GPIO on VDDANA supply with EXTINT[1], SERCOM1 PAD[1] and TCC2 WO[1]; also XOUT32 for the 32kHz crystal oscillator."
      },
      {
        "number": "3",
        "name": "PA02",
        "type": "bidirectional",
        "description": "GPIO on VDDANA supply with EXTINT[2], ADC AIN[0], PTC Y[0] and DAC VOUT."
      },
      {
        "number": "4",
        "name": "PA03",
        "type": "bidirectional",
        "description": "GPIO on VDDANA supply with EXTINT[3], ADC/DAC VREFA, ADC AIN[1] and PTC Y[1]."
      },
      {
        "number": "5",
        "name": "GNDANA",
        "type": "power_in",
        "description": "Analog ground, supply return for the VDDANA domain."
      },
      {
        "number": "6",
        "name": "VDDANA",
        "type": "power_in",
        "description": "Analog supply input powering the analog I/O pins."
      },
      {
        "number": "7",
        "name": "PB08",
        "type": "bidirectional",
        "description": "GPIO on VDDANA supply with EXTINT[8], ADC AIN[2], PTC Y[14], SERCOM4 PAD[0] and TC4 WO[0]."
      },
      {
        "number": "8",
        "name": "PB09",
        "type": "bidirectional",
        "description": "GPIO on VDDANA supply with EXTINT[9], ADC AIN[3], PTC Y[15], SERCOM4 PAD[1] and TC4 WO[1]."
      },
      {
        "number": "9",
        "name": "PA04",
        "type": "bidirectional",
        "description": "GPIO on VDDANA supply with EXTINT[4], ADC/VREFB, ADC AIN[4], AC AIN[0], PTC Y[2] and SERCOM0 PAD[0]."
      },
      {
        "number": "10",
        "name": "PA05",
        "type": "bidirectional",
        "description": "GPIO on VDDANA supply with EXTINT[5], ADC AIN[5], AC AIN[1], PTC Y[3] and SERCOM0 PAD[1]."
      },
      {
        "number": "11",
        "name": "PA06",
        "type": "bidirectional",
        "description": "GPIO on VDDANA supply with EXTINT[6], ADC AIN[6], AC AIN[2], PTC Y[4] and SERCOM0 PAD[2]."
      },
      {
        "number": "12",
        "name": "PA07",
        "type": "bidirectional",
        "description": "GPIO on VDDANA supply with EXTINT[7], ADC AIN[7], AC AIN[3], PTC Y[5], SERCOM0 PAD[3] and I2S SD[0]."
      },
      {
        "number": "13",
        "name": "PA08",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with NMI, ADC AIN[16], PTC X[0], SERCOM0/SERCOM2 PAD[0] and I2S SD[1]."
      },
      {
        "number": "14",
        "name": "PA09",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[9], ADC AIN[17], PTC X[1], SERCOM0/SERCOM2 PAD[1] and I2S MCK[0]."
      },
      {
        "number": "15",
        "name": "PA10",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[10], ADC AIN[18], PTC X[2], SERCOM0/SERCOM2 PAD[2], I2S SCK[0] and GCLK_IO[4]."
      },
      {
        "number": "16",
        "name": "PA11",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[11], ADC AIN[19], PTC X[3], SERCOM0/SERCOM2 PAD[3], I2S FS[0] and GCLK_IO[5]."
      },
      {
        "number": "17",
        "name": "VDDIO",
        "type": "power_in",
        "description": "Digital I/O supply input for the adjacent I/O pins."
      },
      {
        "number": "18",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "19",
        "name": "PB10",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[10], SERCOM4 PAD[2], TC5 WO[0], TCC0 WO[4], I2S MCK[1] and GCLK_IO[4]."
      },
      {
        "number": "20",
        "name": "PB11",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[11], SERCOM4 PAD[3], TC5 WO[1], TCC0 WO[5], I2S SCK[1] and GCLK_IO[5]."
      },
      {
        "number": "21",
        "name": "PA12",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[12], SERCOM2 PAD[0]/SERCOM4 PAD[0], TCC2 WO[0], TCC0 WO[6] and AC CMP[0]."
      },
      {
        "number": "22",
        "name": "PA13",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[13], SERCOM2 PAD[1]/SERCOM4 PAD[1], TCC2 WO[1], TCC0 WO[7] and AC CMP[1]."
      },
      {
        "number": "23",
        "name": "PA14",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[14], SERCOM2/SERCOM4 PAD[2], TC3 WO[0], TCC0 WO[4] and GCLK_IO[0]; also XIN for the crystal oscillator."
      },
      {
        "number": "24",
        "name": "PA15",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[15], SERCOM2/SERCOM4 PAD[3], TC3 WO[1], TCC0 WO[5] and GCLK_IO[1]; also XOUT for the crystal oscillator."
      },
      {
        "number": "25",
        "name": "PA16",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[0], PTC X[4], SERCOM1/SERCOM3 PAD[0], TCC2 WO[0], TCC0 WO[6] and GCLK_IO[2]."
      },
      {
        "number": "26",
        "name": "PA17",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[1], PTC X[5], SERCOM1/SERCOM3 PAD[1], TCC2 WO[1], TCC0 WO[7] and GCLK_IO[3]."
      },
      {
        "number": "27",
        "name": "PA18",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[2], PTC X[6], SERCOM1/SERCOM3 PAD[2], TC3 WO[0], TCC0 WO[2] and AC CMP[0]."
      },
      {
        "number": "28",
        "name": "PA19",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[3], PTC X[7], SERCOM1/SERCOM3 PAD[3], TC3 WO[1], TCC0 WO[3], I2S SD[0] and AC CMP[1]."
      },
      {
        "number": "29",
        "name": "PA20",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[4], PTC X[8], SERCOM5/SERCOM3 PAD[2], TC7 WO[0], TCC0 WO[6], I2S SCK[0] and GCLK_IO[4]."
      },
      {
        "number": "30",
        "name": "PA21",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[5], PTC X[9], SERCOM5/SERCOM3 PAD[3], TC7 WO[1], TCC0 WO[7], I2S FS[0] and GCLK_IO[5]."
      },
      {
        "number": "31",
        "name": "PA22",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[6], PTC X[10], SERCOM3/SERCOM5 PAD[0], TC4 WO[0], TCC0 WO[4] and GCLK_IO[6]."
      },
      {
        "number": "32",
        "name": "PA23",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[7], PTC X[11], SERCOM3/SERCOM5 PAD[1], TC4 WO[1], TCC0 WO[5], USB SOF 1kHz and GCLK_IO[7]."
      },
      {
        "number": "33",
        "name": "PA24",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[12], SERCOM3/SERCOM5 PAD[2], TC5 WO[0], TCC1 WO[2] and USB DM; enable a pull-up if unconnected to avoid extra consumption (<1mA)."
      },
      {
        "number": "34",
        "name": "PA25",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[13], SERCOM3/SERCOM5 PAD[3], TC5 WO[1], TCC1 WO[3] and USB DP; enable a pull-up if unconnected to avoid extra consumption (<1mA)."
      },
      {
        "number": "35",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "36",
        "name": "VDDIO",
        "type": "power_in",
        "description": "Digital I/O supply input for the adjacent I/O pins."
      },
      {
        "number": "37",
        "name": "PB22",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[6], SERCOM5 PAD[2], TC7 WO[0] and GCLK_IO[0]."
      },
      {
        "number": "38",
        "name": "PB23",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[7], SERCOM5 PAD[3], TC7 WO[1] and GCLK_IO[1]."
      },
      {
        "number": "39",
        "name": "PA27",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[15] and GCLK_IO[0]."
      },
      {
        "number": "40",
        "name": "RESET",
        "type": "input",
        "description": "External reset input, active low."
      },
      {
        "number": "41",
        "name": "PA28",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[8] and GCLK_IO[0]."
      },
      {
        "number": "42",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "43",
        "name": "VDDCORE",
        "type": "power_out",
        "description": "Regulated output supply for the core, to be decoupled externally."
      },
      {
        "number": "44",
        "name": "VDDIN",
        "type": "power_in",
        "description": "Input supply for the internal regulator and the adjacent I/O pins."
      },
      {
        "number": "45",
        "name": "PA30",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[10], SERCOM1 PAD[2], TCC1 WO[0] and GCLK_IO[0]; also SWCLK for serial wire debug."
      },
      {
        "number": "46",
        "name": "PA31",
        "type": "bidirectional",
        "description": "GPIO on VDDIO supply with EXTINT[11], SERCOM1 PAD[3] and TCC1 WO[1]; also SWDIO, active only when a debugger is present."
      },
      {
        "number": "47",
        "name": "PB02",
        "type": "bidirectional",
        "description": "GPIO on VDDANA supply with EXTINT[2], ADC AIN[10], PTC Y[8], SERCOM5 PAD[0] and TC6 WO[0]."
      },
      {
        "number": "48",
        "name": "PB03",
        "type": "bidirectional",
        "description": "GPIO on VDDANA supply with EXTINT[3], ADC AIN[11], PTC Y[9], SERCOM5 PAD[1] and TC6 WO[1]."
      },
      {
        "number": "49",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "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: The provided pages do not include the 48-pin QFN package drawing. The pinout figure shows no exposed; Pin 30's label is missing from the pinout figure text. PA21 was assigned from the multiplexing table; The MF suffix is read as QFN (M) with -40 to 125°C (F), per the ordering information. The pinout use"
        ],
        "pages_sent": 118,
        "cost_usd": 0.9382,
        "at": "2026-10-23T03:06:01"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/d70e0a926271e38a2611b8b6dcc19c07.pdf",
        "pages": 1148,
        "sha256": "18ca1ccab5aa330f",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 49,
        "described": 49,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "atsamd21g18a-mf.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7,
          7,
          0.77
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "f2b38b0b4bf967c77e683e8d4599608b9f0503055ec535b93c4ebb5d0163e916",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "atsamd21g18a-mf-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7,
          7,
          0.77
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "3fefa05a3fd9b4f4cf743f6341fd5a257bbd8aa585ceff0d0ae165220ebd722f",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "QFN-48-EP(7x7)",
      "Category": "Embedded Processors & Controllers",
      "Pins": "49"
    },
    "appearance": {
      "contacts": {
        "quote": "including indium tin oxide (ITO) sensor grids. The PTC requires one pin per X-line and one pin per Y-line. In the self-capacitance mode, the PTC requires only one pin (Y-line) for each touch sensor.",
        "page": 859,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
      "datasheet_sha256": "18ca1ccab5aa330f16dfb0b24f5acf9e817998f61734ccad9f56657d409a708b"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "18ca1ccab5aa330f16dfb0b24f5acf9e817998f61734ccad9f56657d409a708b",
      "rows": [
        {
          "name": "Operating voltage (SAM D21)",
          "symbol": "VDD",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.62,
          "typ": null,
          "max": 3.63,
          "conditions": "SAM D21",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "VDDIO supply voltage",
          "symbol": "VDDIO",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.62,
          "typ": null,
          "max": 3.63,
          "conditions": "",
          "source_page": 35,
          "source": "datasheet"
        },
        {
          "name": "VDDIN supply voltage",
          "symbol": "VDDIN",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.62,
          "typ": null,
          "max": 3.63,
          "conditions": "",
          "source_page": 35,
          "source": "datasheet"
        },
        {
          "name": "VDDANA supply voltage",
          "symbol": "VDDANA",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.62,
          "typ": null,
          "max": 3.63,
          "conditions": "",
          "source_page": 35,
          "source": "datasheet"
        },
        {
          "name": "Operating temperature",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "F = -40 - 125°C Matte Sn Plating",
          "source_page": 16,
          "source": "datasheet"
        },
        {
          "name": "VDDCORE regulated voltage",
          "symbol": "VDDCORE",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1.2,
          "max": null,
          "conditions": "Internal regulated voltage output",
          "source_page": 35,
          "source": "datasheet"
        },
        {
          "name": "CPU maximum frequency",
          "symbol": "Fmax",
          "kind": "electrical",
          "unit": "MHz",
          "min": null,
          "typ": null,
          "max": 48,
          "conditions": "Cortex-M0+",
          "source_page": 1,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
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  "discovery_triggers": [
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  "discovery_pitch": "ATSAMD21G18A-MF (Microchip Tech) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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}