ATMEGA1281V-8MU

{
  "schema_version": 1,
  "type": "component",
  "slug": "atmega1281v-8mu",
  "title": "ATMEGA1281V-8MU",
  "brief": "Microchip Tech Pre-ordered MCUs, QFN-64(9x9). 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",
    "atmega1281v-8mu",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "ATMEGA1281V-8MU",
    "manufacturer": "Microchip Tech",
    "package": "QFN-64(9x9)",
    "pin_count": 65,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Pre-ordered MCUs",
    "datasheet": "https://ww1.microchip.com/downloads/en/DeviceDoc/ATmega640-1280-1281-2560-2561-Datasheet-DS40002211A.pdf",
    "parts": {
      "symbol": "atmega1281v-8mu.kicad_sym",
      "footprint": "atmega1281v-8mu.kicad_mod",
      "model_3d": "atmega1281v-8mu-hero.glb",
      "model_3d_plain": "atmega1281v-8mu-etched.glb",
      "model_3d_step": "atmega1281v-8mu-etched.step",
      "model_3d_step_plain": "atmega1281v-8mu.step",
      "lbr": "atmega1281v-8mu.lbr"
    },
    "distributor_links": {
      "lcsc": "C1340522",
      "digikey": "ATMEGA1281V-8MU-ND",
      "mouser": "556-ATMEGA1281V8MU"
    },
    "distributor_check": {
      "checked_at": "2026-10-28T16:20:00Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "ATMEGA1281V-8MU-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "556-ATMEGA1281V8MU",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PG5 (OC0B)",
        "type": "bidirectional",
        "description": "Port G bit 5, an I/O pin with internal pull-up whose alternate function is the Timer/Counter0 Output Compare B output OC0B."
      },
      {
        "number": "2",
        "name": "PE0 (RXD0/PCINT8/PDI)",
        "type": "bidirectional",
        "description": "Port E bit 0, an I/O pin with internal pull-up whose alternate functions are USART0 receive RXD0, pin change interrupt 8 and PDI."
      },
      {
        "number": "3",
        "name": "PE1 (TXD0/PDO)",
        "type": "bidirectional",
        "description": "Port E bit 1, an I/O pin with internal pull-up whose alternate functions are USART0 transmit TXD0 and PDO."
      },
      {
        "number": "4",
        "name": "PE2 (XCK0/AIN0)",
        "type": "bidirectional",
        "description": "Port E bit 2, an I/O pin with internal pull-up whose alternate functions are USART0 external clock XCK0 and analog comparator input AIN0."
      },
      {
        "number": "5",
        "name": "PE3 (OC3A/AIN1)",
        "type": "bidirectional",
        "description": "Port E bit 3, an I/O pin with internal pull-up whose alternate functions are Timer/Counter3 output compare A OC3A and analog comparator input AIN1."
      },
      {
        "number": "6",
        "name": "PE4 (OC3B/INT4)",
        "type": "bidirectional",
        "description": "Port E bit 4, an I/O pin with internal pull-up whose alternate functions are Timer/Counter3 output compare B OC3B and external interrupt 4."
      },
      {
        "number": "7",
        "name": "PE5 (OC3C/INT5)",
        "type": "bidirectional",
        "description": "Port E bit 5, an I/O pin with internal pull-up whose alternate functions are Timer/Counter3 output compare C OC3C and external interrupt 5."
      },
      {
        "number": "8",
        "name": "PE6 (T3/INT6)",
        "type": "bidirectional",
        "description": "Port E bit 6, an I/O pin with internal pull-up whose alternate functions are Timer/Counter3 clock input T3 and external interrupt 6."
      },
      {
        "number": "9",
        "name": "PE7 (ICP3/CLKO/INT7)",
        "type": "bidirectional",
        "description": "Port E bit 7, an I/O pin with internal pull-up whose alternate functions are Timer/Counter3 input capture ICP3, system clock output CLKO and external interrupt 7."
      },
      {
        "number": "10",
        "name": "PB0 (SS/PCINT0)",
        "type": "bidirectional",
        "description": "Port B bit 0, an I/O pin with internal pull-up that serves as the SPI Slave Select input (active low) and pin change interrupt 0."
      },
      {
        "number": "11",
        "name": "PB1 (SCK/PCINT1)",
        "type": "bidirectional",
        "description": "Port B bit 1, an I/O pin with internal pull-up that serves as the SPI clock (master output, slave input) and pin change interrupt 1."
      },
      {
        "number": "12",
        "name": "PB2 (MOSI/PCINT2)",
        "type": "bidirectional",
        "description": "Port B bit 2, an I/O pin with internal pull-up that serves as SPI master data output / slave data input and pin change interrupt 2."
      },
      {
        "number": "13",
        "name": "PB3 (MISO/PCINT3)",
        "type": "bidirectional",
        "description": "Port B bit 3, an I/O pin with internal pull-up that serves as SPI master data input / slave data output and pin change interrupt 3."
      },
      {
        "number": "14",
        "name": "PB4 (OC2A/PCINT4)",
        "type": "bidirectional",
        "description": "Port B bit 4, an I/O pin with internal pull-up whose alternate functions are Timer/Counter2 output compare A OC2A and pin change interrupt 4."
      },
      {
        "number": "15",
        "name": "PB5 (OC1A/PCINT5)",
        "type": "bidirectional",
        "description": "Port B bit 5, an I/O pin with internal pull-up whose alternate functions are Timer/Counter1 output compare A OC1A and pin change interrupt 5."
      },
      {
        "number": "16",
        "name": "PB6 (OC1B/PCINT6)",
        "type": "bidirectional",
        "description": "Port B bit 6, an I/O pin with internal pull-up whose alternate functions are Timer/Counter1 output compare B OC1B and pin change interrupt 6."
      },
      {
        "number": "17",
        "name": "PB7 (OC0A/OC1C/PCINT7)",
        "type": "bidirectional",
        "description": "Port B bit 7, an I/O pin with internal pull-up whose alternate functions are Timer/Counter0 output compare A OC0A, Timer/Counter1 output compare C OC1C and pin change interrupt 7."
      },
      {
        "number": "18",
        "name": "PG3 (TOSC2)",
        "type": "bidirectional",
        "description": "Port G bit 3, an I/O pin with internal pull-up that becomes the inverting output of the Timer/Counter2 oscillator amplifier (TOSC2) when AS2 is set."
      },
      {
        "number": "19",
        "name": "PG4 (TOSC1)",
        "type": "bidirectional",
        "description": "Port G bit 4, an I/O pin with internal pull-up that becomes the input of the Timer/Counter2 inverting oscillator amplifier (TOSC1) when AS2 is set."
      },
      {
        "number": "20",
        "name": "RESET",
        "type": "input",
        "description": "Reset pin (RESET); during parallel programming 11.5V to 12.5V is applied to RESET to enter programming mode."
      },
      {
        "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": "Crystal oscillator pin XTAL2, the inverting oscillator amplifier output."
      },
      {
        "number": "24",
        "name": "XTAL1",
        "type": "input",
        "description": "Crystal oscillator pin XTAL1, the oscillator amplifier / external clock input, which is also pulsed during parallel programming."
      },
      {
        "number": "25",
        "name": "PD0 (SCL/INT0)",
        "type": "bidirectional",
        "description": "Port D bit 0, an I/O pin with internal pull-up that serves as external interrupt 0 and the 2-wire interface clock SCL (open-drain driver with spike filter for spikes shorter than 50ns)."
      },
      {
        "number": "26",
        "name": "PD1 (SDA/INT1)",
        "type": "bidirectional",
        "description": "Port D bit 1, an I/O pin with internal pull-up that serves as external interrupt 1 and the 2-wire interface data SDA (open-drain driver with spike filter for spikes shorter than 50ns)."
      },
      {
        "number": "27",
        "name": "PD2 (RXD1/INT2)",
        "type": "bidirectional",
        "description": "Port D bit 2, an I/O pin with internal pull-up whose alternate functions are USART1 receive RXD1 and external interrupt 2."
      },
      {
        "number": "28",
        "name": "PD3 (TXD1/INT3)",
        "type": "bidirectional",
        "description": "Port D bit 3, an I/O pin with internal pull-up whose alternate functions are USART1 transmit TXD1 and external interrupt 3."
      },
      {
        "number": "29",
        "name": "PD4 (ICP1)",
        "type": "bidirectional",
        "description": "Port D bit 4, an I/O pin with internal pull-up that can act as the Timer/Counter1 input capture pin ICP1."
      },
      {
        "number": "30",
        "name": "PD5 (XCK1)",
        "type": "bidirectional",
        "description": "Port D bit 5, an I/O pin with internal pull-up that serves as USART1 external clock XCK1, an output if DDD5 is set and an input if cleared."
      },
      {
        "number": "31",
        "name": "PD6 (T1)",
        "type": "bidirectional",
        "description": "Port D bit 6, an I/O pin with internal pull-up that serves as the Timer/Counter1 clock input T1."
      },
      {
        "number": "32",
        "name": "PD7 (T0)",
        "type": "bidirectional",
        "description": "Port D bit 7, an I/O pin with internal pull-up that serves as the Timer/Counter0 clock input T0."
      },
      {
        "number": "33",
        "name": "PG0 (WR)",
        "type": "bidirectional",
        "description": "Port G bit 0, an I/O pin with internal pull-up that serves as the external data memory write strobe WR."
      },
      {
        "number": "34",
        "name": "PG1 (RD)",
        "type": "bidirectional",
        "description": "Port G bit 1, an I/O pin with internal pull-up that serves as the external data memory read strobe RD."
      },
      {
        "number": "35",
        "name": "PC0 (A8)",
        "type": "bidirectional",
        "description": "Port C bit 0, an I/O pin with internal pull-up that serves as external memory address bit 8."
      },
      {
        "number": "36",
        "name": "PC1 (A9)",
        "type": "bidirectional",
        "description": "Port C bit 1, an I/O pin with internal pull-up that serves as external memory address bit 9."
      },
      {
        "number": "37",
        "name": "PC2 (A10)",
        "type": "bidirectional",
        "description": "Port C bit 2, an I/O pin with internal pull-up that serves as external memory address bit 10."
      },
      {
        "number": "38",
        "name": "PC3 (A11)",
        "type": "bidirectional",
        "description": "Port C bit 3, an I/O pin with internal pull-up that serves as external memory address bit 11."
      },
      {
        "number": "39",
        "name": "PC4 (A12)",
        "type": "bidirectional",
        "description": "Port C bit 4, an I/O pin with internal pull-up that serves as external memory address bit 12."
      },
      {
        "number": "40",
        "name": "PC5 (A13)",
        "type": "bidirectional",
        "description": "Port C bit 5, an I/O pin with internal pull-up that serves as external memory address bit 13."
      },
      {
        "number": "41",
        "name": "PC6 (A14)",
        "type": "bidirectional",
        "description": "Port C bit 6, an I/O pin with internal pull-up that serves as external memory address bit 14."
      },
      {
        "number": "42",
        "name": "PC7 (A15)",
        "type": "bidirectional",
        "description": "Port C bit 7, an I/O pin with internal pull-up that serves as external memory address bit 15."
      },
      {
        "number": "43",
        "name": "PG2 (ALE)",
        "type": "bidirectional",
        "description": "Port G bit 2, an I/O pin with internal pull-up that serves as the external data memory Address Latch Enable signal ALE."
      },
      {
        "number": "44",
        "name": "PA7 (AD7)",
        "type": "bidirectional",
        "description": "Port A bit 7, an I/O pin with internal pull-up that serves as external memory address and data bit 7."
      },
      {
        "number": "45",
        "name": "PA6 (AD6)",
        "type": "bidirectional",
        "description": "Port A bit 6, an I/O pin with internal pull-up that serves as external memory address and data bit 6."
      },
      {
        "number": "46",
        "name": "PA5 (AD5)",
        "type": "bidirectional",
        "description": "Port A bit 5, an I/O pin with internal pull-up that serves as external memory address and data bit 5."
      },
      {
        "number": "47",
        "name": "PA4 (AD4)",
        "type": "bidirectional",
        "description": "Port A bit 4, an I/O pin with internal pull-up that serves as external memory address and data bit 4."
      },
      {
        "number": "48",
        "name": "PA3 (AD3)",
        "type": "bidirectional",
        "description": "Port A bit 3, an I/O pin with internal pull-up that serves as external memory address and data bit 3."
      },
      {
        "number": "49",
        "name": "PA2 (AD2)",
        "type": "bidirectional",
        "description": "Port A bit 2, an I/O pin with internal pull-up that serves as external memory address and data bit 2."
      },
      {
        "number": "50",
        "name": "PA1 (AD1)",
        "type": "bidirectional",
        "description": "Port A bit 1, an I/O pin with internal pull-up that serves as external memory address and data bit 1."
      },
      {
        "number": "51",
        "name": "PA0 (AD0)",
        "type": "bidirectional",
        "description": "Port A bit 0, an I/O pin with internal pull-up that serves as external memory address and data bit 0."
      },
      {
        "number": "52",
        "name": "VCC",
        "type": "power_in",
        "description": "Digital supply voltage."
      },
      {
        "number": "53",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "54",
        "name": "PF7 (ADC7/TDI)",
        "type": "bidirectional",
        "description": "Port F bit 7, ADC input channel 7 or JTAG Test Data In, with the pull-up active even during reset when JTAG is enabled."
      },
      {
        "number": "55",
        "name": "PF6 (ADC6/TDO)",
        "type": "bidirectional",
        "description": "Port F bit 6, ADC input channel 6 or JTAG Test Data Out, which is tri-stated unless TAP states that shift out data are entered."
      },
      {
        "number": "56",
        "name": "PF5 (ADC5/TMS)",
        "type": "bidirectional",
        "description": "Port F bit 5, ADC input channel 5 or JTAG Test Mode Select, with the pull-up active even during reset when JTAG is enabled."
      },
      {
        "number": "57",
        "name": "PF4 (ADC4/TCK)",
        "type": "bidirectional",
        "description": "Port F bit 4, ADC input channel 4 or JTAG Test Clock, with the pull-up active even during reset when JTAG is enabled."
      },
      {
        "number": "58",
        "name": "PF3 (ADC3)",
        "type": "bidirectional",
        "description": "Port F bit 3, ADC input channel 3, usable as an I/O pin when the A/D Converter is not used."
      },
      {
        "number": "59",
        "name": "PF2 (ADC2)",
        "type": "bidirectional",
        "description": "Port F bit 2, ADC input channel 2, usable as an I/O pin when the A/D Converter is not used."
      },
      {
        "number": "60",
        "name": "PF1 (ADC1)",
        "type": "bidirectional",
        "description": "Port F bit 1, ADC input channel 1, usable as an I/O pin when the A/D Converter is not used."
      },
      {
        "number": "61",
        "name": "PF0 (ADC0)",
        "type": "bidirectional",
        "description": "Port F bit 0, ADC input channel 0, usable as an I/O pin when the A/D Converter is not used."
      },
      {
        "number": "62",
        "name": "AREF",
        "type": "passive",
        "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 (Port F)."
      },
      {
        "number": "65",
        "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+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The 64M2 package has a large exposed center pad that the datasheet says is internally connected to G; The pin descriptions section in the provided text covers only Ports A to J, VCC and GND. Description; The pin types for AREF (passive) and for the port pins (bidirectional) are chosen by the extractor. ",
          "exposed pad 65 added from the footprint",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 77,
        "cost_usd": 0.3161,
        "at": "2026-10-28T16:19:24"
      },
      "datasheet": {
        "url": "https://ww1.microchip.com/downloads/en/DeviceDoc/ATmega640-1280-1281-2560-2561-Datasheet-DS40002211A.pdf",
        "pages": 436,
        "sha256": "978a018098bc1a13",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 65,
        "described": 65,
        "cites_pages": true,
        "refuses_to_fabricate": true
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "QFN-64(9x9)",
      "Category": "Embedded Processors & Controllers",
      "Pins": "65"
    }
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  "discovery_pitch": "ATMEGA1281V-8MU (Microchip Tech) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
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    "name": "Ray",
    "email": "[email protected]"
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