ATTINY25-20SSN

{
  "slug": "attiny25-20ssn",
  "version": "0.1.0",
  "type": "component",
  "description": "Microchip Tech Pre-ordered MCUs, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "embedded processors & controllers",
    "attiny25-20ssn",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "attiny25-20ssn.kicad_sym",
    "attiny25-20ssn.kicad_mod",
    "attiny25-20ssn.glb",
    "attiny25-20ssn.step",
    "attiny25-20ssn.lbr",
    "docs/hero.png",
    "docs/attiny25-20ssn-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "attiny25-20ssn-hero.glb",
    "attiny25-20ssn-hero.overlay.json",
    "attiny25-20ssn-etched.glb"
  ],
  "component": {
    "mpn": "ATTINY25-20SSN",
    "manufacturer": "Microchip Tech",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Pre-ordered MCUs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/fa19b3c4c947962997200319bb493fee.pdf",
    "parts": {
      "symbol": "attiny25-20ssn.kicad_sym",
      "footprint": "attiny25-20ssn.kicad_mod",
      "model_3d": "attiny25-20ssn-hero.glb",
      "model_3d_plain": "attiny25-20ssn-etched.glb",
      "model_3d_step": "attiny25-20ssn-etched.step",
      "model_3d_step_plain": "attiny25-20ssn.step",
      "lbr": "attiny25-20ssn.lbr"
    },
    "distributor_links": {
      "lcsc": "C1339960",
      "digikey": "ATTINY25-20SSN-ND",
      "mouser": "556-ATTINY25-20SSN"
    },
    "distributor_check": {
      "checked_at": "2026-10-23T12:28:31Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "ATTINY25-20SSN-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "556-ATTINY25-20SSN",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PB5",
        "type": "bidirectional",
        "description": "Port B bit 5 (PCINT5/RESET/ADC0/dW): active-low reset input that resets the device when held low longer than the minimum pulse length (even with the clock not running), and also usable as a weak I/O pin."
      },
      {
        "number": "2",
        "name": "PB3",
        "type": "bidirectional",
        "description": "Port B bit 3 (PCINT3/XTAL1/CLKI/OC1B/ADC3): bi-directional I/O with internal pull-up, tri-stated during reset, and exchanged with PB4 in ATtiny15 Compatibility Mode on ATtiny25."
      },
      {
        "number": "3",
        "name": "PB4",
        "type": "bidirectional",
        "description": "Port B bit 4 (PCINT4/XTAL2/CLKO/OC1B/ADC2): bi-directional I/O with internal pull-up, tri-stated during reset, and exchanged with PB3 in ATtiny15 Compatibility Mode on ATtiny25."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "5",
        "name": "PB0",
        "type": "bidirectional",
        "description": "Port B bit 0 (MOSI/DI/SDA/AIN0/OC0A/OC1A/AREF/PCINT0): bi-directional I/O with selectable internal pull-up, tri-stated during reset."
      },
      {
        "number": "6",
        "name": "PB1",
        "type": "bidirectional",
        "description": "Port B bit 1 (MISO/DO/AIN1/OC0B/OC1A/PCINT1): bi-directional I/O with selectable internal pull-up, tri-stated during reset."
      },
      {
        "number": "7",
        "name": "PB2",
        "type": "bidirectional",
        "description": "Port B bit 2 (SCK/USCK/SCL/ADC1/T0/INT0/PCINT2): bi-directional I/O with selectable internal pull-up, tri-stated during reset."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage (2.7 - 5.5V for ATtiny25, 0 - 20 MHz at 4.5 - 5.5V)."
      }
    ],
    "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: PB5/RESET is typed bidirectional because the datasheet says it can also be used as a weak I/O pin; i; The pin figure labels both PB3 and PB4 with OC1B (as printed in the datasheet); this is likely a typ; The datasheet's ordering table shows ATtiny25-20SSN as S8S1 (JEDEC 0.150\" SOIC). The pin figure is s"
        ],
        "pages_sent": 19,
        "cost_usd": 0.1493,
        "at": "2026-10-23T12:28:11"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/fa19b3c4c947962997200319bb493fee.pdf",
        "pages": 30,
        "sha256": "d8b20bb1b8276716",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "attiny25-20ssn.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "attiny25-20ssn-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "ad6709f5c297f52cd21cd789f9c6495a71f03b3ada3025ff47e2715c3b37308e",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}