SN74HC279AN

{
  "slug": "sn74hc279an",
  "version": "0.1.0",
  "type": "component",
  "description": "lingxingic Latches, DIP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "sn74hc279an",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn74hc279an.kicad_sym",
    "sn74hc279an.kicad_mod",
    "sn74hc279an.glb",
    "sn74hc279an.step",
    "sn74hc279an.lbr",
    "docs/hero.png",
    "docs/sn74hc279an-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn74hc279an-hero.glb",
    "sn74hc279an-hero.overlay.json",
    "sn74hc279an-etched.glb"
  ],
  "component": {
    "mpn": "SN74HC279AN",
    "manufacturer": "lingxingic",
    "package": "DIP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Latches",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/2c358e4a3ece3be536e571c3c59706ab.pdf",
    "parts": {
      "symbol": "sn74hc279an.kicad_sym",
      "footprint": "sn74hc279an.kicad_mod",
      "model_3d": "sn74hc279an-hero.glb",
      "model_3d_plain": "sn74hc279an-etched.glb",
      "model_3d_step": "sn74hc279an-etched.step",
      "model_3d_step_plain": "sn74hc279an.step",
      "lbr": "sn74hc279an.lbr"
    },
    "distributor_links": {
      "lcsc": "C41430931"
    },
    "distributor_check": {
      "checked_at": "2026-10-13T18:42:45Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "1R",
        "type": "input",
        "description": "Active-low reset input for latch 1; with both 1S̄1 and 1S̄2 high, a low on 1R̄ drives 1Q low."
      },
      {
        "number": "2",
        "name": "1S1",
        "type": "input",
        "description": "Active-low set input 1 for latch 1; a low on either or both set inputs (1S̄1, 1S̄2) drives 1Q high when 1R̄ is high."
      },
      {
        "number": "3",
        "name": "1S2",
        "type": "input",
        "description": "Active-low set input 2 for latch 1; a low on either or both set inputs (1S̄1, 1S̄2) drives 1Q high when 1R̄ is high."
      },
      {
        "number": "4",
        "name": "1Q",
        "type": "output",
        "description": "Data output of latch 1, which holds its previous level when neither set nor reset is active."
      },
      {
        "number": "5",
        "name": "2R",
        "type": "input",
        "description": "Active-low reset data input for latch 2; a low on 2R̄ with 2S̄ high drives 2Q low."
      },
      {
        "number": "6",
        "name": "2S",
        "type": "input",
        "description": "Active-low set data input for latch 2; a low on 2S̄ with 2R̄ high drives 2Q high."
      },
      {
        "number": "7",
        "name": "2Q",
        "type": "output",
        "description": "Data output of latch 2, which holds its previous level when neither set nor reset is active."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0V) for all voltages."
      },
      {
        "number": "9",
        "name": "3Q",
        "type": "output",
        "description": "Data output of latch 3, which holds its previous level when neither set nor reset is active."
      },
      {
        "number": "10",
        "name": "3R",
        "type": "input",
        "description": "Active-low reset data input for latch 3; a low on 3R̄ with both 3S̄1 and 3S̄2 high drives 3Q low."
      },
      {
        "number": "11",
        "name": "3S1",
        "type": "input",
        "description": "Active-low set input 1 for latch 3; a low on either or both set inputs (3S̄1, 3S̄2) drives 3Q high when 3R̄ is high."
      },
      {
        "number": "12",
        "name": "3S2",
        "type": "input",
        "description": "Active-low set input 2 for latch 3; a low on either or both set inputs (3S̄1, 3S̄2) drives 3Q high when 3R̄ is high."
      },
      {
        "number": "13",
        "name": "4Q",
        "type": "output",
        "description": "Data output of latch 4, which holds its previous level when neither set nor reset is active."
      },
      {
        "number": "14",
        "name": "4R",
        "type": "input",
        "description": "Active-low reset data input for latch 4; a low on 4R̄ with 4S̄ high drives 4Q low."
      },
      {
        "number": "15",
        "name": "4S",
        "type": "input",
        "description": "Active-low set data input for latch 4; a low on 4S̄ with 4R̄ high drives 4Q high."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage: 2.0V to 6.0V for SN74HC279 and 4.5V to 5.5V for SN74HCT279 per the recommended operating conditions."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The DIP16 package is listed in the datasheet (section 5.1 and ordering table) and the pin table on p; The PDF text extraction rendered the overbar on the active-low set and reset names as a dash. Names ; Pin descriptions are summarized from the function table on page 6 because the datasheet gives only t"
        ],
        "pages_sent": 17,
        "cost_usd": 0.0616,
        "at": "2026-10-13T18:42:26"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/2c358e4a3ece3be536e571c3c59706ab.pdf",
        "pages": 17,
        "sha256": "c63ce69b43c6c9e7",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "sn74hc279an.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          19.177,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "17a30b1f0ab3fd5384a1231e3c63c394888d5b952c542a8c189e023ed3467464",
        "checked": "2026-10-13",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74hc279an-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          19.177,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "c3d738eb5d702c0f63d4dabee4f7cba7113f2bf7e2475eb95c69a9aab5c4acff",
        "checked": "2026-10-13",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}