SN74LS279ADR

{
  "slug": "sn74ls279adr",
  "version": "0.1.0",
  "type": "component",
  "description": "lingxingic Latches, SOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "sn74ls279adr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn74ls279adr.kicad_sym",
    "sn74ls279adr.kicad_mod",
    "sn74ls279adr.glb",
    "sn74ls279adr.step",
    "sn74ls279adr.lbr",
    "docs/hero.png",
    "docs/sn74ls279adr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn74ls279adr-hero.glb",
    "sn74ls279adr-hero.overlay.json",
    "sn74ls279adr-etched.glb"
  ],
  "component": {
    "mpn": "SN74LS279ADR",
    "manufacturer": "lingxingic",
    "package": "SOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Latches",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8604435747684835328",
    "parts": {
      "symbol": "sn74ls279adr.kicad_sym",
      "footprint": "sn74ls279adr.kicad_mod",
      "model_3d": "sn74ls279adr-hero.glb",
      "model_3d_plain": "sn74ls279adr-etched.glb",
      "model_3d_step": "sn74ls279adr-etched.step",
      "model_3d_step_plain": "sn74ls279adr.step",
      "lbr": "sn74ls279adr.lbr"
    },
    "distributor_links": {
      "lcsc": "C41430934",
      "digikey": "296-29449-2-ND",
      "mouser": "595-SN74LS279ADR"
    },
    "distributor_check": {
      "checked_at": "2026-10-19T01:32:50Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-29449-2-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-SN74LS279ADR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "1R",
        "type": "input",
        "description": "Reset data input of latch 1; per the function table, a low level here with S high drives 1Q low."
      },
      {
        "number": "2",
        "name": "1S1",
        "type": "input",
        "description": "Set data input 1 of latch 1; a low on either 1S1 or 1S2 sets 1Q high, so both must be high for the set function to be inactive."
      },
      {
        "number": "3",
        "name": "1S2",
        "type": "input",
        "description": "Set data input 2 of latch 1; combined with 1S1, a low on either input sets 1Q high."
      },
      {
        "number": "4",
        "name": "1Q",
        "type": "output",
        "description": "Output of latch 1; it holds its previous state when S and R are both high, goes high on set and low on reset."
      },
      {
        "number": "5",
        "name": "2R",
        "type": "input",
        "description": "Reset data input of latch 2; per the function table, a low level here with S high drives 2Q low."
      },
      {
        "number": "6",
        "name": "2S",
        "type": "input",
        "description": "Set data input of latch 2; a low level sets 2Q high."
      },
      {
        "number": "7",
        "name": "2Q",
        "type": "output",
        "description": "Output of latch 2, following the R-S function table."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V) for the device."
      },
      {
        "number": "9",
        "name": "3Q",
        "type": "output",
        "description": "Output of latch 3, following the R-S function table."
      },
      {
        "number": "10",
        "name": "3R",
        "type": "input",
        "description": "Reset data input of latch 3; per the function table, a low level here with S high drives 3Q low."
      },
      {
        "number": "11",
        "name": "3S1",
        "type": "input",
        "description": "Set data input 1 of latch 3; a low on either 3S1 or 3S2 sets 3Q high, so both must be high for the set function to be inactive."
      },
      {
        "number": "12",
        "name": "3S2",
        "type": "input",
        "description": "Set data input 2 of latch 3; combined with 3S1, a low on either input sets 3Q high."
      },
      {
        "number": "13",
        "name": "4Q",
        "type": "output",
        "description": "Output of latch 4, following the R-S function table."
      },
      {
        "number": "14",
        "name": "4R",
        "type": "input",
        "description": "Reset data input of latch 4; per the function table, a low level here with S high drives 4Q low."
      },
      {
        "number": "15",
        "name": "4S",
        "type": "input",
        "description": "Set data input of latch 4; a low level sets 4Q high."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage; recommended 2.0 V to 6.0 V (typ. 5.0 V), absolute maximum 7 V."
      }
    ],
    "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 datasheet text drops the overbars on R and S. Active-low polarity (R-bar and S-bar) is inferred ; The pinout comes from the pin description table on page 6, which is consistent with the SOP16 orderi; The datasheet gives no per-pin electrical limits except the supply range, so the input and output de"
        ],
        "pages_sent": 17,
        "cost_usd": 0.0554,
        "at": "2026-10-19T01:32:17"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8604435747684835328",
        "pages": 17,
        "sha256": "504e78937b9aca6f",
        "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": "sn74ls279adr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          9.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74ls279adr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          9.9,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "a874be145b5e01a3ccc4b29041d35015faa12d3a8f5ea8d88ff19c3090354027",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}