ATTINY44A-MU

{
  "schema_version": 1,
  "type": "component",
  "slug": "attiny44a-mu",
  "title": "ATTINY44A-MU",
  "brief": "Microchip Tech MICROCHIP, QFN-20-EP(4x4). 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",
    "attiny44a-mu",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "ATTINY44A-MU",
    "manufacturer": "Microchip Tech",
    "package": "QFN-20-EP(4x4)",
    "pin_count": 21,
    "category": "Embedded Processors & Controllers",
    "subcategory": "MICROCHIP",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/632b92321ba4773732b4c364a31a8465.pdf",
    "parts": {
      "symbol": "attiny44a-mu.kicad_sym",
      "footprint": "attiny44a-mu.kicad_mod",
      "model_3d": "attiny44a-mu-hero.glb",
      "model_3d_plain": "attiny44a-mu-etched.glb",
      "model_3d_step": "attiny44a-mu-etched.step",
      "model_3d_step_plain": "attiny44a-mu.step",
      "lbr": "attiny44a-mu.lbr"
    },
    "distributor_links": {
      "lcsc": "C123718",
      "digikey": "ATTINY44A-MU-ND",
      "mouser": "556-ATTINY44A-MU"
    },
    "distributor_check": {
      "checked_at": "2026-10-30T12:01:22Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "ATTINY44A-MU-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "556-ATTINY44A-MU",
        "status": "found",
        "lifecycle": "Not Recommended for New Designs"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PA4",
        "type": "bidirectional",
        "description": "Port A bit 4 with internal pull-up; alternate functions ADC4, USCK/SCL, T1, PCINT4."
      },
      {
        "number": "2",
        "name": "PA3",
        "type": "bidirectional",
        "description": "Port A bit 3 with internal pull-up; alternate functions ADC3, T0, PCINT3."
      },
      {
        "number": "3",
        "name": "PA2",
        "type": "bidirectional",
        "description": "Port A bit 2 with internal pull-up; alternate functions ADC2, AIN1, PCINT2."
      },
      {
        "number": "4",
        "name": "PA1",
        "type": "bidirectional",
        "description": "Port A bit 1 with internal pull-up; alternate functions ADC1, AIN0, PCINT1."
      },
      {
        "number": "5",
        "name": "PA0",
        "type": "bidirectional",
        "description": "Port A bit 0 with internal pull-up; alternate functions ADC0, AREF, PCINT0."
      },
      {
        "number": "6",
        "name": "DNC",
        "type": "unconnected",
        "description": "Do Not Connect."
      },
      {
        "number": "7",
        "name": "DNC",
        "type": "unconnected",
        "description": "Do Not Connect."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "9",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage (1.8 - 5.5V operating range)."
      },
      {
        "number": "10",
        "name": "DNC",
        "type": "unconnected",
        "description": "Do Not Connect."
      },
      {
        "number": "11",
        "name": "PB0",
        "type": "bidirectional",
        "description": "Port B bit 0 with internal pull-up; alternate functions XTAL1/CLKI, PCINT8."
      },
      {
        "number": "12",
        "name": "PB1",
        "type": "bidirectional",
        "description": "Port B bit 1 with internal pull-up; alternate functions XTAL2, PCINT9."
      },
      {
        "number": "13",
        "name": "PB3",
        "type": "input",
        "description": "Port B bit 3 / active-low RESET input (low longer than minimum pulse length resets the device) and debugWIRE; usable as weak I/O if RSTDISBL fuse is programmed."
      },
      {
        "number": "14",
        "name": "PB2",
        "type": "bidirectional",
        "description": "Port B bit 2 with internal pull-up; alternate functions INT0, OC0A, CKOUT, PCINT10."
      },
      {
        "number": "15",
        "name": "PA7",
        "type": "bidirectional",
        "description": "Port A bit 7 with internal pull-up; alternate functions ICP, OC0B, ADC7, PCINT7."
      },
      {
        "number": "16",
        "name": "PA6",
        "type": "bidirectional",
        "description": "Port A bit 6 with internal pull-up; alternate functions OC1A, SDA/MOSI/DI, ADC6, PCINT6."
      },
      {
        "number": "17",
        "name": "DNC",
        "type": "unconnected",
        "description": "Do Not Connect."
      },
      {
        "number": "18",
        "name": "DNC",
        "type": "unconnected",
        "description": "Do Not Connect."
      },
      {
        "number": "19",
        "name": "DNC",
        "type": "unconnected",
        "description": "Do Not Connect."
      },
      {
        "number": "20",
        "name": "PA5",
        "type": "bidirectional",
        "description": "Port A bit 5 with internal pull-up; alternate functions ADC5, DO/MISO, OC1B, PCINT5."
      },
      {
        "number": "21",
        "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 pinout figure text is flattened, so pin-to-number mapping was inferred from the counter-clockwis; The exposed pad has no pin number in the datasheet; 'EP' was used as a label. Its note says only 'sh"
        ],
        "pages_sent": 46,
        "cost_usd": 0.389,
        "at": "2026-10-30T12:01:08"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/632b92321ba4773732b4c364a31a8465.pdf",
        "pages": 286,
        "sha256": "8a18a6b9f81ccee8",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 21,
        "described": 21,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "attiny44a-mu.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4,
          4,
          0.77
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "c9476a1612023de37f27b4972110ab6ac6dc0eaf5ac48957a2e1c497650082a5",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "attiny44a-mu-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4,
          4,
          0.77
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "cdb59a490ef1844093a9d500c5989932bba94895762fa8097d73865b637bb41a",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ],
    "package_dims": {
      "package_code": "20M1",
      "source_page": 276,
      "D": {
        "nom_mm": 4,
        "range_mm": [
          null,
          null
        ]
      },
      "E1": {
        "nom_mm": 4,
        "range_mm": [
          null,
          null
        ]
      },
      "e": {
        "nom_mm": 0.5,
        "range_mm": [
          null,
          null
        ]
      },
      "A": {
        "nom_mm": 0.75,
        "range_mm": [
          0.7,
          0.8
        ]
      },
      "source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
      "model_check": {
        "file": "attiny44a-mu.step",
        "verdict": "PASS",
        "reasons": [
          "height within the datasheet's package drawing"
        ],
        "by": "factory/package_fit.py"
      }
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "QFN-20-EP(4x4)",
      "Category": "Embedded Processors & Controllers",
      "Pins": "21"
    },
    "appearance": {
      "contacts": {
        "quote": "– H: NiPdAu lead finish – F, N, U: matte tin",
        "page": 270,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
      "datasheet_sha256": "8a18a6b9f81ccee8845f879a4d06273665075c9d105df565b25c652c65da14fd"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "8a18a6b9f81ccee8845f879a4d06273665075c9d105df565b25c652c65da14fd",
      "rows": [
        {
          "name": "Operating Temperature (Absolute Maximum)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Voltage on any Pin except RESET with respect to Ground",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 5,
          "conditions": "-0.5V to VCC+0.5V",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Voltage on RESET with respect to Ground",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 13,
          "conditions": "",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Maximum Operating Voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 6,
          "conditions": "",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "DC Current per I/O Pin",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 40,
          "conditions": "",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "DC Current VCC and GND Pins",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 200,
          "conditions": "",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Input Low Voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 0.2,
          "conditions": "VCC = 1.8V - 2.4V; max is 0.2VCC",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Input Low Voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 0.3,
          "conditions": "VCC = 2.4V - 5.5V; max is 0.3VCC",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Input Low Voltage, RESET Pin as Reset",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": 0.2,
          "conditions": "VCC = 1.8V - 5.5; max is 0.2VCC",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Input High-voltage Except RESET pin",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 0.7,
          "typ": null,
          "max": 0.5,
          "conditions": "VCC = 1.8V - 2.4V; min 0.7VCC, max VCC+0.5",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Input High-voltage Except RESET pin",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 0.6,
          "typ": null,
          "max": 0.5,
          "conditions": "VCC = 2.4V - 5.5V; min 0.6VCC, max VCC+0.5",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Input High-voltage RESET pin as Reset",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 0.9,
          "typ": null,
          "max": 0.5,
          "conditions": "VCC = 1.8V to 5.5V; min 0.9VCC, max VCC+0.5",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Output Low Voltage Except RESET pin",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.6,
          "conditions": "IOL = 10 mA, VCC = 5V",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Output Low Voltage Except RESET pin",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.5,
          "conditions": "IOL = 5 mA, VCC = 3V",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Output High-voltage Except RESET pin",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 4.3,
          "typ": null,
          "max": null,
          "conditions": "IOH = -10 mA, VCC = 5V",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Output High-voltage Except RESET pin",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 2.5,
          "typ": null,
          "max": null,
          "conditions": "IOH = -5 mA, VCC = 3V",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Input Leakage Current I/O Pin (pin low)",
          "symbol": "ILIL",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.05,
          "max": 1,
          "conditions": "VCC = 5.5V, pin low (absolute value)",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Input Leakage Current I/O Pin (pin high)",
          "symbol": "ILIH",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.05,
          "max": 1,
          "conditions": "VCC = 5.5V, pin high (absolute value)",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Pull-up Resistor, I/O Pin",
          "symbol": "RPU",
          "kind": "electrical",
          "unit": "kΩ",
          "min": 20,
          "typ": null,
          "max": 50,
          "conditions": "VCC = 5.5V, input low",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Pull-up Resistor, Reset Pin",
          "symbol": "RPU",
          "kind": "electrical",
          "unit": "kΩ",
          "min": 30,
          "typ": null,
          "max": 60,
          "conditions": "VCC = 5.5V, input low",
          "source_page": 173,
          "source": "datasheet"
        },
        {
          "name": "Supply Current, Active Mode",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.25,
          "max": 0.5,
          "conditions": "f = 1 MHz, VCC = 2V",
          "source_page": 174,
          "source": "datasheet"
        },
        {
          "name": "Supply Current, Active Mode",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 1.2,
          "max": 2,
          "conditions": "f = 4 MHz, VCC = 3V",
          "source_page": 174,
          "source": "datasheet"
        },
        {
          "name": "Supply Current, Active Mode",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 4.4,
          "max": 7,
          "conditions": "f = 8 MHz, VCC = 5V",
          "source_page": 174,
          "source": "datasheet"
        },
        {
          "name": "Supply Current, Idle Mode",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.04,
          "max": 0.2,
          "conditions": "f = 1 MHz, VCC = 2V",
          "source_page": 174,
          "source": "datasheet"
        },
        {
          "name": "Supply Current, Idle Mode",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.25,
          "max": 0.6,
          "conditions": "f = 4 MHz, VCC = 3V",
          "source_page": 174,
          "source": "datasheet"
        },
        {
          "name": "Supply Current, Idle Mode",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 1.3,
          "max": 2,
          "conditions": "f = 8 MHz, VCC = 5V",
          "source_page": 174,
          "source": "datasheet"
        },
        {
          "name": "Supply Current, Power-Down Mode",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 4,
          "max": 10,
          "conditions": "WDT enabled, VCC = 3V",
          "source_page": 174,
          "source": "datasheet"
        },
        {
          "name": "Supply Current, Power-Down Mode",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.13,
          "max": 2,
          "conditions": "WDT disabled, VCC = 3V",
          "source_page": 174,
          "source": "datasheet"
        },
        {
          "name": "Clock Frequency",
          "symbol": "1/tCLCL",
          "kind": "timing",
          "unit": "MHz",
          "min": 0,
          "typ": null,
          "max": 4,
          "conditions": "VCC = 1.8 - 5.5V",
          "source_page": 175,
          "source": "datasheet"
        },
        {
          "name": "Clock Frequency",
          "symbol": "1/tCLCL",
          "kind": "timing",
          "unit": "MHz",
          "min": 0,
          "typ": null,
          "max": 10,
          "conditions": "VCC = 2.7 - 5.5V",
          "source_page": 175,
          "source": "datasheet"
        },
        {
          "name": "Clock Frequency",
          "symbol": "1/tCLCL",
          "kind": "timing",
          "unit": "MHz",
          "min": 0,
          "typ": null,
          "max": 20,
          "conditions": "VCC = 4.5 - 5.5V",
          "source_page": 175,
          "source": "datasheet"
        },
        {
          "name": "RESET pin threshold voltage",
          "symbol": "VRST",
          "kind": "electrical",
          "unit": "V",
          "min": 0.2,
          "typ": null,
          "max": 0.9,
          "conditions": "min 0.2VCC, max 0.9VCC",
          "source_page": 176,
          "source": "datasheet"
        },
        {
          "name": "Brown-out Detector hysteresis",
          "symbol": "VHYST",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 50,
          "max": null,
          "conditions": "",
          "source_page": 176,
          "source": "datasheet"
        },
        {
          "name": "Internal bandgap reference voltage",
          "symbol": "VBG",
          "kind": "electrical",
          "unit": "V",
          "min": 1,
          "typ": 1.1,
          "max": 1.2,
          "conditions": "VCC = 5V, TA = 25°C",
          "source_page": 176,
          "source": "datasheet"
        },
        {
          "name": "Release threshold of power-on reset",
          "symbol": "VPOR",
          "kind": "electrical",
          "unit": "V",
          "min": 1.1,
          "typ": 1.4,
          "max": 1.6,
          "conditions": "TA = -40°C to +85°C",
          "source_page": 176,
          "source": "datasheet"
        },
        {
          "name": "Activation threshold of power-on reset",
          "symbol": "VPOA",
          "kind": "electrical",
          "unit": "V",
          "min": 0.6,
          "typ": 1.3,
          "max": 1.6,
          "conditions": "TA = -40°C to +85°C",
          "source_page": 176,
          "source": "datasheet"
        },
        {
          "name": "Brown-out threshold",
          "symbol": "VBOT",
          "kind": "electrical",
          "unit": "V",
          "min": 1.7,
          "typ": 1.8,
          "max": 2,
          "conditions": "BODLEVEL[2:0] = 110",
          "source_page": 176,
          "source": "datasheet"
        },
        {
          "name": "Brown-out threshold",
          "symbol": "VBOT",
          "kind": "electrical",
          "unit": "V",
          "min": 2.5,
          "typ": 2.7,
          "max": 2.9,
          "conditions": "BODLEVEL[2:0] = 101",
          "source_page": 176,
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