ATSAMD21G18A-MU

{
  "schema_version": 1,
  "type": "component",
  "slug": "atsamd21g18a-mu",
  "title": "ATSAMD21G18A-MU",
  "brief": "Microchip Microcontrollers (MCU/MPU/SOC), QFN-48-EP(7x7). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "mcu",
    "atsamd21g18a-mu"
  ],
  "component": {
    "mpn": "ATSAMD21G18A-MU",
    "manufacturer": "Microchip",
    "package": "QFN-48-EP(7x7)",
    "pin_count": 49,
    "category": "MCU",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2201131330_Microchip-Tech-ATSAMD21G18A-MU_C966903.pdf",
    "parts": {
      "symbol": "atsamd21g18a-mu.kicad_sym",
      "footprint": "atsamd21g18a-mu.kicad_mod",
      "model_3d": "atsamd21g18a-mu-etched.glb",
      "model_3d_plain": "atsamd21g18a-mu.glb",
      "model_3d_step": "atsamd21g18a-mu-etched.step",
      "model_3d_step_plain": "atsamd21g18a-mu.step",
      "lbr": "atsamd21g18a-mu.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "PA00",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[0], SERCOM1/PAD[0] (USART/SPI/I2C), TCC2/WO[0]. Powered from VDDANA."
      },
      {
        "number": "2",
        "name": "PA01",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[1], SERCOM1/PAD[1], TCC2/WO[1]. Powered from VDDANA."
      },
      {
        "number": "3",
        "name": "PA02",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[2], ADC AIN[0], PTC Y[0], DAC VOUT, TCC3/WO[0]. Powered from VDDANA."
      },
      {
        "number": "4",
        "name": "PA03",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[3], ADC/DAC VREFA input, ADC AIN[1], PTC Y[1], TCC3/WO[1]. Powered from VDDANA."
      },
      {
        "number": "5",
        "name": "GNDANA",
        "type": "power_in",
        "description": "Analog ground return for VDDANA supply and the internal analog blocks (ADC, DAC, AC, references)."
      },
      {
        "number": "6",
        "name": "VDDANA",
        "type": "power_in",
        "description": "Analog supply, 1.62-3.63 V. Powers the ADC, DAC, analog comparators, references, and the VDDANA-domain PORT pins. Must be decoupled and typically tied to VDDIN."
      },
      {
        "number": "7",
        "name": "PB08",
        "type": "bidirectional",
        "description": "Port B GPIO. Muxed: EXTINT[8], ADC AIN[2], PTC Y[14], SERCOM4/PAD[0], TC4/WO[0], TCC3/WO[6]. Powered from VDDANA."
      },
      {
        "number": "8",
        "name": "PB09",
        "type": "bidirectional",
        "description": "Port B GPIO. Muxed: EXTINT[9], ADC AIN[3], PTC Y[15], SERCOM4/PAD[1], TC4/WO[1], TCC3/WO[7]. Powered from VDDANA."
      },
      {
        "number": "9",
        "name": "PA04",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[4], ADC/VREFB input, ADC AIN[4], AC AIN[0], PTC Y[2], SERCOM0/PAD[0], TCC0/WO[0], TCC3/WO[2]. Powered from VDDANA."
      },
      {
        "number": "10",
        "name": "PA05",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[5], ADC AIN[5], AC AIN[1], PTC Y[3], SERCOM0/PAD[1], TCC0/WO[1], TCC3/WO[3]. Powered from VDDANA."
      },
      {
        "number": "11",
        "name": "PA06",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[6], ADC AIN[6], AC AIN[2], PTC Y[4], SERCOM0/PAD[2], TCC1/WO[0], TCC3/WO[4]. Powered from VDDANA."
      },
      {
        "number": "12",
        "name": "PA07",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[7], ADC AIN[7], AC AIN[3], PTC Y[5], SERCOM0/PAD[3], TCC1/WO[1], TCC3/WO[5], I2S/SD[0]. Powered from VDDANA."
      },
      {
        "number": "13",
        "name": "PA08",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: NMI, ADC AIN[16], PTC X[0], SERCOM0/PAD[0], SERCOM2/PAD[0], TCC0/WO[0], TCC1/WO[2], I2S/SD[1]. Powered from VDDIO."
      },
      {
        "number": "14",
        "name": "PA09",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[9], ADC AIN[17], PTC X[1], SERCOM0/PAD[1], SERCOM2/PAD[1], TCC0/WO[1], TCC1/WO[3], I2S/MCK[0]. Powered from VDDIO."
      },
      {
        "number": "15",
        "name": "PA10",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[10], ADC AIN[18], PTC X[2], SERCOM0/PAD[2], SERCOM2/PAD[2], TCC1/WO[0], TCC0/WO[2], I2S/SCK[0], GCLK_IO[4]. Powered from VDDIO."
      },
      {
        "number": "16",
        "name": "PA11",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[11], ADC AIN[19], PTC X[3], SERCOM0/PAD[3], SERCOM2/PAD[3], TCC1/WO[1], TCC0/WO[3], I2S/FS[0], GCLK_IO[5]. Powered from VDDIO."
      },
      {
        "number": "17",
        "name": "VDDIO",
        "type": "power_in",
        "description": "Digital I/O supply, 1.62-3.63 V. Powers the VDDIO-domain PORT pins. Must be decoupled locally."
      },
      {
        "number": "18",
        "name": "GND",
        "type": "power_in",
        "description": "Digital ground return for the VDDIO and VDDCORE domains."
      },
      {
        "number": "19",
        "name": "PB10",
        "type": "bidirectional",
        "description": "Port B GPIO. Muxed: EXTINT[10], SERCOM4/PAD[2], TC5/WO[0], TCC0/WO[4], I2S/MCK[1], GCLK_IO[4]. Powered from VDDIO."
      },
      {
        "number": "20",
        "name": "PB11",
        "type": "bidirectional",
        "description": "Port B GPIO. Muxed: EXTINT[11], SERCOM4/PAD[3], TC5/WO[1], TCC0/WO[5], I2S/SCK[1], GCLK_IO[5]. Powered from VDDIO."
      },
      {
        "number": "21",
        "name": "PA12",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[12], SERCOM2/PAD[0], SERCOM4/PAD[0], TCC2/WO[0], TCC0/WO[6], AC/CMP[0]. Powered from VDDIO."
      },
      {
        "number": "22",
        "name": "PA13",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[13], SERCOM2/PAD[1], SERCOM4/PAD[1], TCC2/WO[1], TCC0/WO[7], AC/CMP[1]. Powered from VDDIO."
      },
      {
        "number": "23",
        "name": "PA14",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[14], SERCOM2/PAD[2], SERCOM4/PAD[2], TC3/WO[0], TCC0/WO[4], GCLK_IO[0]. Powered from VDDIO."
      },
      {
        "number": "24",
        "name": "PA15",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[15], SERCOM2/PAD[3], SERCOM4/PAD[3], TC3/WO[1], TCC0/WO[5], GCLK_IO[1]. Powered from VDDIO."
      },
      {
        "number": "25",
        "name": "PA16",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[0], PTC X[4], SERCOM1/PAD[0], SERCOM3/PAD[0], TCC2/WO[0], TCC0/WO[6], GCLK_IO[2]. Powered from VDDIO."
      },
      {
        "number": "26",
        "name": "PA17",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[1], PTC X[5], SERCOM1/PAD[1], SERCOM3/PAD[1], TCC2/WO[1], TCC0/WO[7], GCLK_IO[3]. Powered from VDDIO."
      },
      {
        "number": "27",
        "name": "PA18",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[2], PTC X[6], SERCOM1/PAD[2], SERCOM3/PAD[2], TC3/WO[0], TCC0/WO[2], AC/CMP[0]. Powered from VDDIO."
      },
      {
        "number": "28",
        "name": "PA19",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[3], PTC X[7], SERCOM1/PAD[3], SERCOM3/PAD[3], TC3/WO[1], TCC0/WO[3], I2S/SD[0], AC/CMP[1]. Powered from VDDIO."
      },
      {
        "number": "29",
        "name": "PA20",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[4], PTC X[8], SERCOM5/PAD[2], SERCOM3/PAD[2], TC7/WO[0], TCC0/WO[6], I2S/SCK[0], GCLK_IO[4]. Powered from VDDIO."
      },
      {
        "number": "30",
        "name": "PA21",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[5], PTC X[9], SERCOM5/PAD[3], SERCOM3/PAD[3], TC7/WO[1], TCC0/WO[7], I2S/FS[0], GCLK_IO[5]. Powered from VDDIO."
      },
      {
        "number": "31",
        "name": "PA22",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[6], PTC X[10], SERCOM3/PAD[0], SERCOM5/PAD[0], TC4/WO[0], TCC0/WO[4], GCLK_IO[6]. Powered from VDDIO."
      },
      {
        "number": "32",
        "name": "PA23",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[7], PTC X[11], SERCOM3/PAD[1], SERCOM5/PAD[1], TC4/WO[1], TCC0/WO[5], USB/SOF 1kHz, GCLK_IO[7]. Powered from VDDIO."
      },
      {
        "number": "33",
        "name": "PA24",
        "type": "bidirectional",
        "description": "USB D- (USB/DM) by default. Alternate: EXTINT[12], SERCOM3/PAD[2], SERCOM5/PAD[2], TC5/WO[0], TCC1/WO[2]. Enable pull-up in input GPIO mode if unused. Powered from VDDIO."
      },
      {
        "number": "34",
        "name": "PA25",
        "type": "bidirectional",
        "description": "USB D+ (USB/DP) by default. Alternate: EXTINT[13], SERCOM3/PAD[3], SERCOM5/PAD[3], TC5/WO[1], TCC1/WO[3]. Enable pull-up in input GPIO mode if unused. Powered from VDDIO."
      },
      {
        "number": "35",
        "name": "GND",
        "type": "power_in",
        "description": "Digital ground return for the VDDIO and VDDCORE domains."
      },
      {
        "number": "36",
        "name": "VDDIO",
        "type": "power_in",
        "description": "Digital I/O supply, 1.62-3.63 V. Powers the VDDIO-domain PORT pins. Must be decoupled locally."
      },
      {
        "number": "37",
        "name": "PB22",
        "type": "bidirectional",
        "description": "Port B GPIO. Muxed: EXTINT[6], SERCOM5/PAD[2], TC7/WO[0], TCC3/WO[0], GCLK_IO[0]. Powered from VDDIO."
      },
      {
        "number": "38",
        "name": "PB23",
        "type": "bidirectional",
        "description": "Port B GPIO. Muxed: EXTINT[7], SERCOM5/PAD[3], TC7/WO[1], TCC3/WO[1], GCLK_IO[1]. Powered from VDDIO."
      },
      {
        "number": "39",
        "name": "PA27",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[15], TCC3/WO[6], GCLK_IO[0]. Powered from VDDIO."
      },
      {
        "number": "40",
        "name": "RESET",
        "type": "input",
        "description": "Active-low reset input. Internal pull-up; drive low to reset the device."
      },
      {
        "number": "41",
        "name": "PA28",
        "type": "bidirectional",
        "description": "Port A GPIO. Muxed: EXTINT[8], TCC3/WO[7], GCLK_IO[0]. Powered from VDDIO."
      },
      {
        "number": "42",
        "name": "VDDCORE",
        "type": "power_out",
        "description": "1.2 V internal regulator output for the core. Decouple externally (typically 1 uF ceramic to GND). Do not drive from an external source."
      },
      {
        "number": "43",
        "name": "VDDIN",
        "type": "power_in",
        "description": "Main supply input to the on-chip voltage regulator, 1.62-3.63 V. Decouple locally; typically tied to VDDIO/VDDANA."
      },
      {
        "number": "44",
        "name": "GND",
        "type": "power_in",
        "description": "Digital ground return for the regulator (VDDIN/VDDCORE) domain."
      },
      {
        "number": "45",
        "name": "PA30",
        "type": "bidirectional",
        "description": "SWCLK (Serial Wire Debug clock) by default in the presence of a debugger. Alternate: EXTINT[10], SERCOM1/PAD[2], TCC1/WO[0], TCC3/WO[4], GCLK_IO[0]. Powered from VDDIO."
      },
      {
        "number": "46",
        "name": "PA31",
        "type": "bidirectional",
        "description": "SWDIO (Serial Wire Debug data I/O) - activated in the presence of a debugger. Alternate: EXTINT[11], SERCOM1/PAD[3], TCC1/WO[1], TCC3/WO[5]. Powered from VDDIO."
      },
      {
        "number": "47",
        "name": "PB02",
        "type": "bidirectional",
        "description": "Port B GPIO. Muxed: EXTINT[2], ADC AIN[10], PTC Y[8], SERCOM5/PAD[0], TC6/WO[0], TCC3/WO[2]. Powered from VDDANA."
      },
      {
        "number": "48",
        "name": "PB03",
        "type": "bidirectional",
        "description": "Port B GPIO. Muxed: EXTINT[3], ADC AIN[11], PTC Y[9], SERCOM5/PAD[1], TC6/WO[1], TCC3/WO[3]. Powered from VDDANA."
      },
      {
        "number": "EP",
        "name": "GND",
        "type": "power_in",
        "description": "Exposed thermal pad on the QFN package underside. Must be soldered to the PCB ground plane for thermal and electrical performance."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2201131330_Microchip-Tech-ATSAMD21G18A-MU_C966903.pdf",
        "pages": 1115,
        "sha256": "3aaa8a6575530d72",
        "source_tier": "lcsc"
      },
      "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-mu.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.0,
          7.0,
          0.77
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "f2b38b0b4bf967c77e683e8d4599608b9f0503055ec535b93c4ebb5d0163e916",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "atsamd21g18a-mu-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.0,
          7.0,
          0.77
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "6eae3ca49718d49f5d152fc23a6e65add9f15924b19353d5bd52c6a3c8fe2205",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip",
      "Package": "QFN-48-EP(7x7)",
      "Category": "MCU",
      "Pins": "49"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "atsamd21g18a-mu"
  ],
  "discovery_pitch": "ATSAMD21G18A-MU (Microchip) 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",
    "atsamd21g18a-mu.kicad_sym",
    "atsamd21g18a-mu.kicad_mod",
    "atsamd21g18a-mu.glb",
    "atsamd21g18a-mu.step",
    "atsamd21g18a-mu.lbr",
    "docs/hero.png",
    "docs/atsamd21g18a-mu-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "atsamd21g18a-mu-etched.step"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T17:18:34.970Z"
}