ATMEGA1281-16MU

{
  "slug": "atmega1281-16mu",
  "version": "0.1.0",
  "type": "component",
  "description": "Microchip Tech MICROCHIP, QFN-64-EP(9x9). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "embedded processors & controllers",
    "atmega1281-16mu",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "atmega1281-16mu.kicad_sym",
    "atmega1281-16mu.kicad_mod",
    "atmega1281-16mu.glb",
    "atmega1281-16mu.step",
    "atmega1281-16mu.lbr",
    "docs/hero.png",
    "docs/atmega1281-16mu-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "atmega1281-16mu-hero.glb",
    "atmega1281-16mu-hero.overlay.json",
    "atmega1281-16mu-etched.glb"
  ],
  "component": {
    "mpn": "ATMEGA1281-16MU",
    "manufacturer": "Microchip Tech",
    "package": "QFN-64-EP(9x9)",
    "pin_count": 65,
    "category": "Embedded Processors & Controllers",
    "subcategory": "MICROCHIP",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/f5baa51aa3082973274b29bd8b273679.pdf",
    "parts": {
      "symbol": "atmega1281-16mu.kicad_sym",
      "footprint": "atmega1281-16mu.kicad_mod",
      "model_3d": "atmega1281-16mu-hero.glb",
      "model_3d_plain": "atmega1281-16mu-etched.glb",
      "model_3d_step": "atmega1281-16mu-etched.step",
      "model_3d_step_plain": "atmega1281-16mu.step",
      "lbr": "atmega1281-16mu.lbr"
    },
    "distributor_links": {
      "lcsc": "C1337444",
      "digikey": "ATMEGA1281-16MU-ND"
    },
    "distributor_check": {
      "checked_at": "2026-10-31T18:46:44Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "ATMEGA1281-16MU-ND",
        "status": "found"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PG5",
        "type": "bidirectional",
        "description": "Port G bit 5 I/O with internal pull-up; alternate function OC0B (Timer/Counter0 output compare B / PWM)."
      },
      {
        "number": "2",
        "name": "PE0",
        "type": "bidirectional",
        "description": "Port E bit 0 I/O with internal pull-up; alternate functions RXD0/PCINT8/PDI."
      },
      {
        "number": "3",
        "name": "PE1",
        "type": "bidirectional",
        "description": "Port E bit 1 I/O with internal pull-up; alternate functions TXD0/PDO."
      },
      {
        "number": "4",
        "name": "PE2",
        "type": "bidirectional",
        "description": "Port E bit 2 I/O with internal pull-up; alternate functions XCK0/AIN0."
      },
      {
        "number": "5",
        "name": "PE3",
        "type": "bidirectional",
        "description": "Port E bit 3 I/O with internal pull-up; alternate functions OC3A/AIN1."
      },
      {
        "number": "6",
        "name": "PE4",
        "type": "bidirectional",
        "description": "Port E bit 4 I/O with internal pull-up; alternate functions OC3B/INT4."
      },
      {
        "number": "7",
        "name": "PE5",
        "type": "bidirectional",
        "description": "Port E bit 5 I/O with internal pull-up; alternate functions OC3C/INT5."
      },
      {
        "number": "8",
        "name": "PE6",
        "type": "bidirectional",
        "description": "Port E bit 6 I/O with internal pull-up; alternate functions T3/INT6."
      },
      {
        "number": "9",
        "name": "PE7",
        "type": "bidirectional",
        "description": "Port E bit 7 I/O with internal pull-up; alternate functions ICP3/CLKO/INT7."
      },
      {
        "number": "10",
        "name": "PB0",
        "type": "bidirectional",
        "description": "Port B bit 0 I/O with internal pull-up; alternate functions SS/PCINT0 (SPI slave select input)."
      },
      {
        "number": "11",
        "name": "PB1",
        "type": "bidirectional",
        "description": "Port B bit 1 I/O with internal pull-up; alternate functions SCK/PCINT1 (SPI clock)."
      },
      {
        "number": "12",
        "name": "PB2",
        "type": "bidirectional",
        "description": "Port B bit 2 I/O with internal pull-up; alternate functions MOSI/PCINT2 (SPI data)."
      },
      {
        "number": "13",
        "name": "PB3",
        "type": "bidirectional",
        "description": "Port B bit 3 I/O with internal pull-up; alternate functions MISO/PCINT3 (SPI data)."
      },
      {
        "number": "14",
        "name": "PB4",
        "type": "bidirectional",
        "description": "Port B bit 4 I/O with internal pull-up; alternate functions OC2A/PCINT4."
      },
      {
        "number": "15",
        "name": "PB5",
        "type": "bidirectional",
        "description": "Port B bit 5 I/O with internal pull-up; alternate functions OC1A/PCINT5."
      },
      {
        "number": "16",
        "name": "PB6",
        "type": "bidirectional",
        "description": "Port B bit 6 I/O with internal pull-up; alternate functions OC1B/PCINT6."
      },
      {
        "number": "17",
        "name": "PB7",
        "type": "bidirectional",
        "description": "Port B bit 7 I/O with internal pull-up; alternate functions OC0A/OC1C/PCINT7."
      },
      {
        "number": "18",
        "name": "PG3",
        "type": "bidirectional",
        "description": "Port G bit 3 I/O with internal pull-up; alternate function TOSC2 (RTC oscillator output when AS2 set)."
      },
      {
        "number": "19",
        "name": "PG4",
        "type": "bidirectional",
        "description": "Port G bit 4 I/O with internal pull-up; alternate function TOSC1 (RTC oscillator input when AS2 set)."
      },
      {
        "number": "20",
        "name": "RESET",
        "type": "input",
        "description": "Active-low reset input; pin is shown with overbar in pinout."
      },
      {
        "number": "21",
        "name": "VCC",
        "type": "power_in",
        "description": "Digital supply voltage."
      },
      {
        "number": "22",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "23",
        "name": "XTAL2",
        "type": "output",
        "description": "Oscillator/clock circuit pin XTAL2."
      },
      {
        "number": "24",
        "name": "XTAL1",
        "type": "input",
        "description": "Oscillator/clock circuit pin XTAL1 (also used for external clock input)."
      },
      {
        "number": "25",
        "name": "PD0",
        "type": "bidirectional",
        "description": "Port D bit 0 I/O with internal pull-up; alternate functions SCL/INT0 (2-wire clock, open-drain when TWI enabled)."
      },
      {
        "number": "26",
        "name": "PD1",
        "type": "bidirectional",
        "description": "Port D bit 1 I/O with internal pull-up; alternate functions SDA/INT1 (2-wire data, open-drain when TWI enabled)."
      },
      {
        "number": "27",
        "name": "PD2",
        "type": "bidirectional",
        "description": "Port D bit 2 I/O with internal pull-up; alternate functions RXD1/INT2."
      },
      {
        "number": "28",
        "name": "PD3",
        "type": "bidirectional",
        "description": "Port D bit 3 I/O with internal pull-up; alternate functions TXD1/INT3."
      },
      {
        "number": "29",
        "name": "PD4",
        "type": "bidirectional",
        "description": "Port D bit 4 I/O with internal pull-up; alternate function ICP1."
      },
      {
        "number": "30",
        "name": "PD5",
        "type": "bidirectional",
        "description": "Port D bit 5 I/O with internal pull-up; alternate function XCK1."
      },
      {
        "number": "31",
        "name": "PD6",
        "type": "bidirectional",
        "description": "Port D bit 6 I/O with internal pull-up; alternate function T1."
      },
      {
        "number": "32",
        "name": "PD7",
        "type": "bidirectional",
        "description": "Port D bit 7 I/O with internal pull-up; alternate function T0."
      },
      {
        "number": "33",
        "name": "PG0",
        "type": "bidirectional",
        "description": "Port G bit 0 I/O with internal pull-up; alternate function WR (external memory write strobe)."
      },
      {
        "number": "34",
        "name": "PG1",
        "type": "bidirectional",
        "description": "Port G bit 1 I/O with internal pull-up; alternate function RD (external memory read strobe)."
      },
      {
        "number": "35",
        "name": "PC0",
        "type": "bidirectional",
        "description": "Port C bit 0 I/O with internal pull-up; alternate function A8 (external memory address)."
      },
      {
        "number": "36",
        "name": "PC1",
        "type": "bidirectional",
        "description": "Port C bit 1 I/O with internal pull-up; alternate function A9 (external memory address)."
      },
      {
        "number": "37",
        "name": "PC2",
        "type": "bidirectional",
        "description": "Port C bit 2 I/O with internal pull-up; alternate function A10 (external memory address)."
      },
      {
        "number": "38",
        "name": "PC3",
        "type": "bidirectional",
        "description": "Port C bit 3 I/O with internal pull-up; alternate function A11 (external memory address)."
      },
      {
        "number": "39",
        "name": "PC4",
        "type": "bidirectional",
        "description": "Port C bit 4 I/O with internal pull-up; alternate function A12 (external memory address)."
      },
      {
        "number": "40",
        "name": "PC5",
        "type": "bidirectional",
        "description": "Port C bit 5 I/O with internal pull-up; alternate function A13 (external memory address)."
      },
      {
        "number": "41",
        "name": "PC6",
        "type": "bidirectional",
        "description": "Port C bit 6 I/O with internal pull-up; alternate function A14 (external memory address)."
      },
      {
        "number": "42",
        "name": "PC7",
        "type": "bidirectional",
        "description": "Port C bit 7 I/O with internal pull-up; alternate function A15 (external memory address)."
      },
      {
        "number": "43",
        "name": "PG2",
        "type": "bidirectional",
        "description": "Port G bit 2 I/O with internal pull-up; alternate function ALE (external memory address latch enable)."
      },
      {
        "number": "44",
        "name": "PA7",
        "type": "bidirectional",
        "description": "Port A bit 7 I/O with internal pull-up; alternate function AD7 (external memory address/data)."
      },
      {
        "number": "45",
        "name": "PA6",
        "type": "bidirectional",
        "description": "Port A bit 6 I/O with internal pull-up; alternate function AD6 (external memory address/data)."
      },
      {
        "number": "46",
        "name": "PA5",
        "type": "bidirectional",
        "description": "Port A bit 5 I/O with internal pull-up; alternate function AD5 (external memory address/data)."
      },
      {
        "number": "47",
        "name": "PA4",
        "type": "bidirectional",
        "description": "Port A bit 4 I/O with internal pull-up; alternate function AD4 (external memory address/data)."
      },
      {
        "number": "48",
        "name": "PA3",
        "type": "bidirectional",
        "description": "Port A bit 3 I/O with internal pull-up; alternate function AD3 (external memory address/data)."
      },
      {
        "number": "49",
        "name": "PA2",
        "type": "bidirectional",
        "description": "Port A bit 2 I/O with internal pull-up; alternate function AD2 (external memory address/data)."
      },
      {
        "number": "50",
        "name": "PA1",
        "type": "bidirectional",
        "description": "Port A bit 1 I/O with internal pull-up; alternate function AD1 (external memory address/data)."
      },
      {
        "number": "51",
        "name": "PA0",
        "type": "bidirectional",
        "description": "Port A bit 0 I/O with internal pull-up; alternate function AD0 (external memory address/data)."
      },
      {
        "number": "52",
        "name": "VCC",
        "type": "power_in",
        "description": "Digital supply voltage."
      },
      {
        "number": "53",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "54",
        "name": "PF7",
        "type": "bidirectional",
        "description": "Port F bit 7; ADC7 analog input or JTAG TDI."
      },
      {
        "number": "55",
        "name": "PF6",
        "type": "bidirectional",
        "description": "Port F bit 6; ADC6 analog input or JTAG TDO (tri-stated unless shifting data)."
      },
      {
        "number": "56",
        "name": "PF5",
        "type": "bidirectional",
        "description": "Port F bit 5; ADC5 analog input or JTAG TMS."
      },
      {
        "number": "57",
        "name": "PF4",
        "type": "bidirectional",
        "description": "Port F bit 4; ADC4 analog input or JTAG TCK."
      },
      {
        "number": "58",
        "name": "PF3",
        "type": "bidirectional",
        "description": "Port F bit 3; ADC3 analog input channel 3."
      },
      {
        "number": "59",
        "name": "PF2",
        "type": "bidirectional",
        "description": "Port F bit 2; ADC2 analog input channel 2."
      },
      {
        "number": "60",
        "name": "PF1",
        "type": "bidirectional",
        "description": "Port F bit 1; ADC1 analog input channel 1."
      },
      {
        "number": "61",
        "name": "PF0",
        "type": "bidirectional",
        "description": "Port F bit 0; ADC0 analog input channel 0."
      },
      {
        "number": "62",
        "name": "AREF",
        "type": "input",
        "description": "Analog reference pin for the A/D converter."
      },
      {
        "number": "63",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "64",
        "name": "AVCC",
        "type": "power_in",
        "description": "Supply voltage pin for the A/D converter."
      },
      {
        "number": "65",
        "name": "EP",
        "type": "power_in",
        "description": "Exposed center pad, internally connected to GND; should be soldered or glued to the board for mechanical stability."
      }
    ],
    "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: Figure 1-3 text extraction does not print pin numbers next to names and lists names in non-sequentia; The exposed pad has no printed pin number; '65' is a convention. The datasheet says only that the pa; The datasheet gives no pin-level electrical limits; AREF and XTAL1/XTAL2 types are inferred from fun",
          "15/65 pins cited to the wrong page (name found elsewhere): ['21:VCC@p7', '22:GND@p7', '23:XTAL2@p4', '24:XTAL1@p4']"
        ],
        "pages_sent": 85,
        "cost_usd": 0.7074,
        "at": "2026-10-31T18:46:30"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/f5baa51aa3082973274b29bd8b273679.pdf",
        "pages": 435,
        "sha256": "48878ac033dc6185",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 65,
        "described": 65,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "atmega1281-16mu.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9.0,
          9.0,
          0.75
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "dce07a86ec3fe3ca87eebdff13827f55e036ced5518fee01f85cec4a3f56366d",
        "checked": "2026-10-31",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "atmega1281-16mu-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9.0,
          9.0,
          0.75
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "ec557ffdfdbc55fb98f357cc61c058b19ec990cc8f2f50bb979d9486216e34a4",
        "checked": "2026-10-31",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}