MC74VHC138DTR2G

{
  "slug": "mc74vhc138dtr2g",
  "version": "0.1.0",
  "type": "component",
  "description": "onsemi Signal Switches, Multiplexers, Decoders, TSSOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "mc74vhc138dtr2g",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "mc74vhc138dtr2g.kicad_sym",
    "mc74vhc138dtr2g.kicad_mod",
    "mc74vhc138dtr2g.glb",
    "mc74vhc138dtr2g.step",
    "mc74vhc138dtr2g.lbr",
    "docs/hero.png",
    "docs/mc74vhc138dtr2g-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
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    "mc74vhc138dtr2g-hero.overlay.json",
    "mc74vhc138dtr2g-etched.glb"
  ],
  "component": {
    "mpn": "MC74VHC138DTR2G",
    "manufacturer": "onsemi",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://www.onsemi.com/pdf/datasheet/mc74vhc138dtr2-d.pdf",
    "parts": {
      "symbol": "mc74vhc138dtr2g.kicad_sym",
      "footprint": "mc74vhc138dtr2g.kicad_mod",
      "model_3d": "mc74vhc138dtr2g-hero.glb",
      "model_3d_plain": "mc74vhc138dtr2g-etched.glb",
      "model_3d_step": "mc74vhc138dtr2g-etched.step",
      "model_3d_step_plain": "mc74vhc138dtr2g.step",
      "lbr": "mc74vhc138dtr2g.lbr"
    },
    "distributor_links": {
      "lcsc": "C463311",
      "digikey": "MC74VHC138DTR2GOSTR-ND",
      "mouser": "863-MC74VHC138DTR2G"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T04:36:14Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "MC74VHC138DTR2GOSTR-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "863-MC74VHC138DTR2G",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "A0",
        "type": "input",
        "description": "Binary select input A0 of the 3-to-8 decoder; inputs tolerate up to 7 V and must be held within GND to VCC or tied to a logic level when unused."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "Binary select input A1 of the 3-to-8 decoder; inputs tolerate up to 7 V and must be held within GND to VCC or tied to a logic level when unused."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "input",
        "description": "Binary select input A2 of the 3-to-8 decoder; inputs tolerate up to 7 V and must be held within GND to VCC or tied to a logic level when unused."
      },
      {
        "number": "4",
        "name": "E1",
        "type": "input",
        "description": "Active-high enable input; when E1 is held High the decoding function is inhibited and all outputs go High."
      },
      {
        "number": "5",
        "name": "E2",
        "type": "input",
        "description": "Active-high enable input; when E2 is held High the decoding function is inhibited and all outputs go High."
      },
      {
        "number": "6",
        "name": "E3",
        "type": "input",
        "description": "Active-low enable input; when E3 is held Low the decoding function is inhibited and all outputs go High."
      },
      {
        "number": "7",
        "name": "Y7",
        "type": "output",
        "description": "Active-low decoded output Y7, driven by a buffer stage that goes Low when the address is 111 with the device enabled."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device; Vin and Vout must stay within GND to VCC."
      },
      {
        "number": "9",
        "name": "Y6",
        "type": "output",
        "description": "Active-low decoded output Y6, goes Low when the address is 110 with the device enabled."
      },
      {
        "number": "10",
        "name": "Y5",
        "type": "output",
        "description": "Active-low decoded output Y5, goes Low when the address is 101 with the device enabled."
      },
      {
        "number": "11",
        "name": "Y4",
        "type": "output",
        "description": "Active-low decoded output Y4, goes Low when the address is 100 with the device enabled."
      },
      {
        "number": "12",
        "name": "Y3",
        "type": "output",
        "description": "Active-low decoded output Y3, goes Low when the address is 011 with the device enabled."
      },
      {
        "number": "13",
        "name": "Y2",
        "type": "output",
        "description": "Active-low decoded output Y2, goes Low when the address is 010 with the device enabled."
      },
      {
        "number": "14",
        "name": "Y1",
        "type": "output",
        "description": "Active-low decoded output Y1, goes Low when the address is 001 with the device enabled."
      },
      {
        "number": "15",
        "name": "Y0",
        "type": "output",
        "description": "Active-low decoded output Y0, goes Low when the address is 000 with the device enabled."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply; the datasheet specifies a DC supply range of 2.0 V to 5.5 V and absolute maximum of -0.5 V to 7.0 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 page 2 pin-assignment graphic and the page 3 logic-diagram labels are scrambled in the extracted; Pin numbers for A0-A2 and Y0-Y7 were confirmed from the IEC and expanded logic diagrams on page 3 (Y; GND=8 and VCC=16 are taken from the scrambled page 2 pin-assignment list, which is consistent with t"
        ],
        "pages_sent": 8,
        "cost_usd": 0.0883,
        "at": "2026-10-18T04:31:24"
      },
      "datasheet": {
        "url": "https://www.onsemi.com/pdf/datasheet/mc74vhc138dtr2-d.pdf",
        "pages": 8,
        "sha256": "20c8764ebb22ca67",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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      "footprint": "viewers/footprint.html"
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        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
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        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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        "sha256": "d9dabdba14b56724b3c5485ad6773289c1b7207f8365861ef883536aa7379ecb",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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}