74AHC138BQ

{
  "slug": "74ahc138bq",
  "version": "0.1.0",
  "type": "component",
  "description": "Nexperia Signal Switches, Multiplexers, Decoders, DHVQFN-16-EP(2.5x3.5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "74ahc138bq",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "74ahc138bq.kicad_sym",
    "74ahc138bq.kicad_mod",
    "74ahc138bq.glb",
    "74ahc138bq.step",
    "74ahc138bq.lbr",
    "docs/hero.png",
    "docs/74ahc138bq-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "74ahc138bq-hero.glb",
    "74ahc138bq-hero.overlay.json",
    "74ahc138bq-etched.glb"
  ],
  "component": {
    "mpn": "74AHC138BQ",
    "manufacturer": "Nexperia",
    "package": "DHVQFN-16-EP(2.5x3.5)",
    "pin_count": 17,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://assets.nexperia.com/documents/data-sheet/74AHC138BQ.pdf",
    "parts": {
      "symbol": "74ahc138bq.kicad_sym",
      "footprint": "74ahc138bq.kicad_mod",
      "model_3d": "74ahc138bq-hero.glb",
      "model_3d_plain": "74ahc138bq-etched.glb",
      "model_3d_step": "74ahc138bq-etched.step",
      "model_3d_step_plain": "74ahc138bq.step",
      "lbr": "74ahc138bq.lbr"
    },
    "distributor_links": {
      "lcsc": "C554237"
    },
    "distributor_check": {
      "checked_at": "2026-10-17T16:34:35Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "A0",
        "type": "input",
        "description": "Address input A0, the least significant binary weighted address input of the 3-to-8 decoder."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "Address input A1, a binary weighted address input of the 3-to-8 decoder."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "input",
        "description": "Address input A2, the most significant binary weighted address input of the 3-to-8 decoder."
      },
      {
        "number": "4",
        "name": "E1",
        "type": "input",
        "description": "Enable input E1 is active LOW; every output is HIGH unless E1 and E2 are LOW and E3 is HIGH."
      },
      {
        "number": "5",
        "name": "E2",
        "type": "input",
        "description": "Enable input E2 is active LOW; every output is HIGH unless E1 and E2 are LOW and E3 is HIGH."
      },
      {
        "number": "6",
        "name": "E3",
        "type": "input",
        "description": "Enable input E3 is active HIGH; every output is HIGH unless E1 and E2 are LOW and E3 is HIGH."
      },
      {
        "number": "7",
        "name": "Y7",
        "type": "output",
        "description": "Output Y7 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground (0 V) reference for all voltages on the device."
      },
      {
        "number": "9",
        "name": "Y6",
        "type": "output",
        "description": "Output Y6 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "10",
        "name": "Y5",
        "type": "output",
        "description": "Output Y5 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "11",
        "name": "Y4",
        "type": "output",
        "description": "Output Y4 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "12",
        "name": "Y3",
        "type": "output",
        "description": "Output Y3 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "13",
        "name": "Y2",
        "type": "output",
        "description": "Output Y2 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "14",
        "name": "Y1",
        "type": "output",
        "description": "Output Y1 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "15",
        "name": "Y0",
        "type": "output",
        "description": "Output Y0 is one of eight mutually exclusive outputs that are LOW when selected."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage; recommended range is 2.0 V to 5.5 V for 74AHC138 and 4.5 V to 5.5 V for 74AHCT138."
      },
      {
        "number": "17",
        "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-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Table 2 gives one pin list for SO16, TSSOP16 and DHVQFN16. Fig 5 shows the DHVQFN16 terminal layout ",
          "exposed pad 17 added from the footprint"
        ],
        "pages_sent": 17,
        "cost_usd": 0.0488,
        "at": "2026-10-17T16:30:16"
      },
      "datasheet": {
        "url": "https://assets.nexperia.com/documents/data-sheet/74AHC138BQ.pdf",
        "pages": 17,
        "sha256": "63520b5b696b050e",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 17,
        "described": 17,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "74ahc138bq.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.52,
          3.52,
          0.9
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "341e432808065681837553f017291b90e6e5e731cbd112d4d0c8f9f4e7b4153e",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "74ahc138bq-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0.0,
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        "footprint_binding": "identity",
        "sha256": "c397fd3d13cca8f3365ac98ec6b22c89ee830e19f33a7d1ea420267e7a1894b8",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}