SN74HC42N

{
  "slug": "sn74hc42n",
  "version": "0.1.0",
  "type": "component",
  "description": "XBLW Signal Switches, Multiplexers, Decoders, DIP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "sn74hc42n",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn74hc42n.kicad_sym",
    "sn74hc42n.kicad_mod",
    "sn74hc42n.glb",
    "sn74hc42n.step",
    "sn74hc42n.lbr",
    "docs/hero.png",
    "docs/sn74hc42n-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn74hc42n-hero.glb",
    "sn74hc42n-hero.overlay.json",
    "sn74hc42n-etched.glb"
  ],
  "component": {
    "mpn": "SN74HC42N",
    "manufacturer": "XBLW",
    "package": "DIP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602767381580165120",
    "parts": {
      "symbol": "sn74hc42n.kicad_sym",
      "footprint": "sn74hc42n.kicad_mod",
      "model_3d": "sn74hc42n-hero.glb",
      "model_3d_plain": "sn74hc42n-etched.glb",
      "model_3d_step": "sn74hc42n-etched.step",
      "model_3d_step_plain": "sn74hc42n.step",
      "lbr": "sn74hc42n.lbr"
    },
    "distributor_links": {
      "lcsc": "C19708131",
      "digikey": "296-8332-5-ND",
      "mouser": "595-SN74HC42N"
    },
    "distributor_check": {
      "checked_at": "2026-10-16T06:02:19Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-8332-5-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-SN74HC42N",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "~{0Y}",
        "type": "output",
        "description": "Active-low decoded output 0 (multiplexer output), LOW only for BCD input code 0000 and HIGH for all codes above nine."
      },
      {
        "number": "2",
        "name": "~{1Y}",
        "type": "output",
        "description": "Active-low decoded output 1 (multiplexer output), LOW only for BCD input code 0001."
      },
      {
        "number": "3",
        "name": "~{2Y}",
        "type": "output",
        "description": "Active-low decoded output 2 (multiplexer output), LOW only for BCD input code 0010."
      },
      {
        "number": "4",
        "name": "~{3Y}",
        "type": "output",
        "description": "Active-low decoded output 3 (multiplexer output), LOW only for BCD input code 0011."
      },
      {
        "number": "5",
        "name": "~{4Y}",
        "type": "output",
        "description": "Active-low decoded output 4 (multiplexer output), LOW only for BCD input code 0100."
      },
      {
        "number": "6",
        "name": "~{5Y}",
        "type": "output",
        "description": "Active-low decoded output 5 (multiplexer output), LOW only for BCD input code 0101."
      },
      {
        "number": "7",
        "name": "~{6Y}",
        "type": "output",
        "description": "Active-low decoded output 6 (multiplexer output), LOW only for BCD input code 0110."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground (0V), the reference for all voltages in the absolute maximum ratings."
      },
      {
        "number": "9",
        "name": "~{7Y}",
        "type": "output",
        "description": "Active-low decoded output 7 (multiplexer output), LOW only for BCD input code 0111."
      },
      {
        "number": "10",
        "name": "~{8Y}",
        "type": "output",
        "description": "Active-low decoded output 8 (multiplexer output), LOW only for BCD input code 1000."
      },
      {
        "number": "11",
        "name": "~{9Y}",
        "type": "output",
        "description": "Active-low decoded output 9 (multiplexer output), LOW only for BCD input code 1001."
      },
      {
        "number": "12",
        "name": "3A",
        "type": "input",
        "description": "Data input 3A, the most significant BCD input, which can act as an inhibit input in 1-of-8 decoding or as data input in 8-output demultiplexing, with clamp diodes."
      },
      {
        "number": "13",
        "name": "2A",
        "type": "input",
        "description": "BCD data input 2A, with clamp diodes permitting current-limiting resistors for voltages above VCC."
      },
      {
        "number": "14",
        "name": "1A",
        "type": "input",
        "description": "BCD data input 1A, with clamp diodes permitting current-limiting resistors for voltages above VCC."
      },
      {
        "number": "15",
        "name": "0A",
        "type": "input",
        "description": "BCD data input 0A, the least significant input, with clamp diodes permitting current-limiting resistors for voltages above VCC."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage, absolute maximum -0.5V to +7.0V."
      }
    ],
    "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": "vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Output pin names carry overbars in the datasheet. I wrote them as ~{nY}. I did not read pages 6-12, ",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 12,
        "cost_usd": 0.319,
        "at": "2026-10-16T06:01:54"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602767381580165120",
        "pages": 15,
        "sha256": "6781db981abd06aa",
        "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": "sn74hc42n.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": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74hc42n-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": "b24f4764adf89b2006cb75dd3b520b7621bc410a13b31c5f4c330dacbe7f8cc5",
        "checked": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}