ATSAMD21G16B-AU

{
  "schema_version": 1,
  "type": "component",
  "slug": "atsamd21g16b-au",
  "title": "ATSAMD21G16B-AU",
  "brief": "Microchip Tech Pre-ordered MCUs, TQFP-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": [
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    "embedded processors & controllers",
    "atsamd21g16b-au",
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    "extractor-text"
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  "component": {
    "mpn": "ATSAMD21G16B-AU",
    "manufacturer": "Microchip Tech",
    "package": "TQFP-48(7x7)",
    "pin_count": 48,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Pre-ordered MCUs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/d70e0a926271e38a2611b8b6dcc19c07.pdf",
    "parts": {
      "symbol": "atsamd21g16b-au.kicad_sym",
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      "model_3d_step": "atsamd21g16b-au-etched.step",
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      "lbr": "atsamd21g16b-au.lbr"
    },
    "distributor_links": {
      "lcsc": "C619062",
      "digikey": "ATSAMD21G16B-AU-ND",
      "mouser": "556-ATSAMD21G16B-AU"
    },
    "distributor_check": {
      "checked_at": "2026-11-13T14:43:47Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "ATSAMD21G16B-AU-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "556-ATSAMD21G16B-AU",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PA00",
        "type": "bidirectional",
        "description": "PORT group A general-purpose I/O in the VDDANA domain, also EXTINT[0] and the XIN32 32 kHz crystal input when the 32 kHz oscillator is enabled (Table 7-3)."
      },
      {
        "number": "2",
        "name": "PA01",
        "type": "bidirectional",
        "description": "PORT group A general-purpose I/O in the VDDANA domain, also EXTINT[1] and the XOUT32 32 kHz crystal output when the 32 kHz oscillator is enabled (Table 7-3)."
      },
      {
        "number": "3",
        "name": "PA02",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDANA domain with EXTINT[2], analog input AIN[0], and DAC output VOUT; analog functions require peripheral function B to be selected to disable digital control of the pin."
      },
      {
        "number": "4",
        "name": "PA03",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDANA domain with EXTINT[3], analog input AIN[1], and DAC/VREFA external reference; analog functions require peripheral function B to be selected."
      },
      {
        "number": "5",
        "name": "GNDANA",
        "type": "power_in",
        "description": "Ground return for the analog domain, paired with VDDANA (pin 6)."
      },
      {
        "number": "6",
        "name": "VDDANA",
        "type": "power_in",
        "description": "Analog supply for the ADC, DAC and analog comparators; the SAM D21 operating voltage is stated as 1.62V to 3.63V."
      },
      {
        "number": "7",
        "name": "PB08",
        "type": "bidirectional",
        "description": "PORT group B I/O in the VDDANA domain with EXTINT[8], analog input AIN[2], PTC Y[14], SERCOM4/PAD[0] and TC4/WO[0]."
      },
      {
        "number": "8",
        "name": "PB09",
        "type": "bidirectional",
        "description": "PORT group B I/O in the VDDANA domain with EXTINT[9], analog input AIN[3], PTC Y[15], SERCOM4/PAD[1] and TC4/WO[1]."
      },
      {
        "number": "9",
        "name": "PA04",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDANA domain with EXTINT[4], ADC/VREFB reference, analog input AIN[4], SERCOM0/PAD[0] and TCC0/WO[0]."
      },
      {
        "number": "10",
        "name": "PA05",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDANA domain with EXTINT[5], analog input AIN[5], SERCOM0/PAD[1] and TCC0/WO[1]."
      },
      {
        "number": "11",
        "name": "PA06",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDANA domain with EXTINT[6], analog input AIN[6], SERCOM0/PAD[2] and TCC1/WO[0]."
      },
      {
        "number": "12",
        "name": "PA07",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDANA domain with EXTINT[7], analog input AIN[7], SERCOM0/PAD[3] and TCC1/WO[1]."
      },
      {
        "number": "13",
        "name": "PA08",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with NMI, analog input AIN[16], PTC X[0], SERCOM0/PAD[0], SERCOM2/PAD[0] and TCC0/WO[0]; supports I2C per Table 7-5."
      },
      {
        "number": "14",
        "name": "PA09",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[9], analog input AIN[17], PTC X[1], SERCOM0/PAD[1], SERCOM2/PAD[1] and TCC0/WO[1]; supports I2C per Table 7-5."
      },
      {
        "number": "15",
        "name": "PA10",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[10], analog input AIN[18], PTC X[2], SERCOM0/PAD[2], SERCOM2/PAD[2] and TCC1/WO[0]."
      },
      {
        "number": "16",
        "name": "PA11",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[11], analog input AIN[19], PTC X[3], SERCOM0/PAD[3], SERCOM2/PAD[3] and TCC1/WO[1]."
      },
      {
        "number": "17",
        "name": "VDDIO",
        "type": "power_in",
        "description": "Digital I/O supply for the I/O pins of this group; the SAM D21 operating voltage is stated as 1.62V to 3.63V."
      },
      {
        "number": "18",
        "name": "GND",
        "type": "power_in",
        "description": "Digital ground for the I/O ring, paired with VDDIO (pin 17)."
      },
      {
        "number": "19",
        "name": "PB10",
        "type": "bidirectional",
        "description": "PORT group B I/O in the VDDIO domain 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": "PORT group B I/O in the VDDIO domain 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": "PORT group A I/O in the VDDIO domain 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": "PORT group A I/O in the VDDIO domain 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": "PORT group A I/O in the VDDIO domain with EXTINT[14], SERCOM2/PAD[2], SERCOM4/PAD[2], TC3/WO[0], TCC0/WO[4] and GCLK_IO[0]; also the XIN input of the main crystal oscillator (Table 7-3)."
      },
      {
        "number": "24",
        "name": "PA15",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[15], SERCOM2/PAD[3], SERCOM4/PAD[3], TC3/WO[1], TCC0/WO[5] and GCLK_IO[1]; also the XOUT output of the main crystal oscillator (Table 7-3)."
      },
      {
        "number": "25",
        "name": "PA16",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[0], PTC X[4], SERCOM1/PAD[0], SERCOM3/PAD[0], TCC2/WO[0], TCC0/WO[6] and GCLK_IO[2]."
      },
      {
        "number": "26",
        "name": "PA17",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[1], PTC X[5], SERCOM1/PAD[1], SERCOM3/PAD[1], TCC2/WO[1], TCC0/WO[7] and GCLK_IO[3]."
      },
      {
        "number": "27",
        "name": "PA18",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[2], PTC X[6], SERCOM1/PAD[2], SERCOM3/PAD[2], TC3/WO[0], TCC0/WO[2] and AC/CMP[0]."
      },
      {
        "number": "28",
        "name": "PA19",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[3], PTC X[7], SERCOM1/PAD[3], SERCOM3/PAD[3], TC3/WO[1], TCC0/WO[3], I2S/SD[0] and AC/CMP[1]."
      },
      {
        "number": "29",
        "name": "PA20",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[4], PTC X[8], SERCOM5/PAD[2], SERCOM3/PAD[2], TC7/WO[0], TCC0/WO[6], I2S/SCK[0] and GCLK_IO[4]."
      },
      {
        "number": "30",
        "name": "PA21",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[5], PTC X[9], SERCOM5/PAD[3], SERCOM3/PAD[3], TC7/WO[1], TCC0/WO[7], I2S/FS[0] and GCLK_IO[5]; the name is taken from the G-series column of Table 7-1 because the page 21 pin text omits it."
      },
      {
        "number": "31",
        "name": "PA22",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[6], PTC X[10], SERCOM3/PAD[0], SERCOM5/PAD[0], TC4/WO[0], TCC0/WO[4] and GCLK_IO[6]; supports I2C per Table 7-5."
      },
      {
        "number": "32",
        "name": "PA23",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[7], PTC X[11], SERCOM3/PAD[1], SERCOM5/PAD[1], TC4/WO[1], TCC0/WO[5], USB SOF 1kHz and GCLK_IO[7]; supports I2C per Table 7-5."
      },
      {
        "number": "33",
        "name": "PA24",
        "type": "bidirectional",
        "description": "USB DM data line with EXTINT[12], SERCOM3/PAD[2], SERCOM5/PAD[2], TC5/WO[0] and TCC1/WO[2]; if unconnected, a pull-up is recommended to avoid power draw below 1 mA, and this pin has no drive strength option."
      },
      {
        "number": "34",
        "name": "PA25",
        "type": "bidirectional",
        "description": "USB DP data line with EXTINT[13], SERCOM3/PAD[3], SERCOM5/PAD[3], TC5/WO[1] and TCC1/WO[3]; if unconnected, a pull-up is recommended to avoid power draw below 1 mA, and this pin has no drive strength option."
      },
      {
        "number": "35",
        "name": "GND",
        "type": "power_in",
        "description": "Digital ground for the I/O ring."
      },
      {
        "number": "36",
        "name": "VDDIO",
        "type": "power_in",
        "description": "Digital I/O supply for the I/O pins of this group; the SAM D21 operating voltage is stated as 1.62V to 3.63V."
      },
      {
        "number": "37",
        "name": "PB22",
        "type": "bidirectional",
        "description": "PORT group B I/O in the VDDIO domain with EXTINT[6], SERCOM5/PAD[2], TC7/WO[0], TCC3/WO[0] and GCLK_IO[0]."
      },
      {
        "number": "38",
        "name": "PB23",
        "type": "bidirectional",
        "description": "PORT group B I/O in the VDDIO domain with EXTINT[7], SERCOM5/PAD[3], TC7/WO[1], TCC3/WO[1] and GCLK_IO[1]."
      },
      {
        "number": "39",
        "name": "PA27",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[15], TCC3/WO[6] and GCLK_IO[0]."
      },
      {
        "number": "40",
        "name": "RESET",
        "type": "input",
        "description": "Active-low external reset input for the device."
      },
      {
        "number": "41",
        "name": "PA28",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[8], TCC3/WO[7] and GCLK_IO[0]."
      },
      {
        "number": "42",
        "name": "GND",
        "type": "power_in",
        "description": "Digital ground for the core and I/O domain, paired with VDDCORE and VDDIN."
      },
      {
        "number": "43",
        "name": "VDDCORE",
        "type": "power_out",
        "description": "Regulated output of the internal voltage regulator that supplies the core; the datasheet pin legend classifies it as a regulated output supply, not an input."
      },
      {
        "number": "44",
        "name": "VDDIN",
        "type": "power_in",
        "description": "Input supply to the internal voltage regulator; the SAM D21 operating voltage is stated as 1.62V to 3.63V."
      },
      {
        "number": "45",
        "name": "PA30",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[10], SERCOM1/PAD[2], TCC1/WO[0], TCC3/WO[4], GCLK_IO[0] and the SWCLK Serial Wire Debug clock (Table 7-4)."
      },
      {
        "number": "46",
        "name": "PA31",
        "type": "bidirectional",
        "description": "PORT group A I/O in the VDDIO domain with EXTINT[11], SERCOM1/PAD[3], TCC1/WO[1], TCC3/WO[5] and the SWDIO Serial Wire Debug data line, which is only activated when a debugger is present."
      },
      {
        "number": "47",
        "name": "PB02",
        "type": "bidirectional",
        "description": "PORT group B I/O in the VDDANA domain with EXTINT[2], analog input AIN[10], PTC Y[8], SERCOM5/PAD[0], TC6/WO[0] and TCC3/WO[2]."
      },
      {
        "number": "48",
        "name": "PB03",
        "type": "bidirectional",
        "description": "PORT group B I/O in the VDDANA domain with EXTINT[3], analog input AIN[11], PTC Y[9], SERCOM5/PAD[1], TC6/WO[1] and TCC3/WO[3]."
      }
    ],
    "provenance": {
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        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The page 21 pin text for TQFP48 shows pin 30 with no name. PA21 was taken from the SAMD2xG column of; The 48-pin TQFP package drawing and its 7x7 mm body size are not in the extracted text; only the 64-; Pins listed as VDDANA-domain analog-capable I/O are typed bidirectional, the KiCad class for PORT GP"
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        "pages_sent": 118,
        "cost_usd": 0.6201,
        "at": "2026-11-13T14:43:36"
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        "pages": 1148,
        "sha256": "18ca1ccab5aa330f",
        "source_tier": "mfr"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
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    "package_dims": {
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  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "TQFP-48(7x7)",
      "Category": "Embedded Processors & Controllers",
      "Pins": "48"
    },
    "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"
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          "name": "VDDIO supply voltage",
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          "min": 1.62,
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          "max": 3.63,
          "conditions": "Powers I/O lines, OSC8M and XOSC",
          "source_page": 35,
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          "name": "VDDIN supply voltage",
          "symbol": "VDDIN",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.62,
          "typ": null,
          "max": 3.63,
          "conditions": "Powers I/O lines and the internal regulator",
          "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": "Powers I/O lines, ADC, AC, DAC, PTC, OSCULP32K, OSC32K, XOSC32K",
          "source_page": 35,
          "source": "datasheet"
        },
        {
          "name": "Operating temperature (ordering grade U)",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "Package grade U = -40 to 85°C per SAM D21 ordering code; MPN suffix -AU",
          "source_page": 16,
          "source": "datasheet"
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