TC74HC138APF

{
  "slug": "tc74hc138apf",
  "version": "0.1.0",
  "type": "component",
  "description": "TOSHIBA Signal Switches, Multiplexers, Decoders, DIP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "tc74hc138apf",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "tc74hc138apf.kicad_sym",
    "tc74hc138apf.kicad_mod",
    "tc74hc138apf.glb",
    "tc74hc138apf.step",
    "tc74hc138apf.lbr",
    "docs/hero.png",
    "docs/tc74hc138apf-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "tc74hc138apf-hero.glb",
    "tc74hc138apf-hero.overlay.json",
    "tc74hc138apf-etched.glb"
  ],
  "component": {
    "mpn": "TC74HC138APF",
    "manufacturer": "TOSHIBA",
    "package": "DIP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588928751443333120",
    "parts": {
      "symbol": "tc74hc138apf.kicad_sym",
      "footprint": "tc74hc138apf.kicad_mod",
      "model_3d": "tc74hc138apf-hero.glb",
      "model_3d_plain": "tc74hc138apf-etched.glb",
      "model_3d_step": "tc74hc138apf-etched.step",
      "model_3d_step_plain": "tc74hc138apf.step",
      "lbr": "tc74hc138apf.lbr"
    },
    "distributor_links": {
      "lcsc": "C1547249",
      "digikey": "TC74HC138APF-ND",
      "mouser": "757-TC74HC138APF"
    },
    "distributor_check": {
      "checked_at": "2026-10-16T13:10:19Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "TC74HC138APF-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "757-TC74HC138APF",
        "status": "found",
        "lifecycle": "New Product"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "A",
        "type": "input",
        "description": "Binary select input A (LSB) that together with B and C selects which one of outputs Y0-Y7 goes low."
      },
      {
        "number": "2",
        "name": "B",
        "type": "input",
        "description": "Binary select input B that together with A and C selects which one of outputs Y0-Y7 goes low."
      },
      {
        "number": "3",
        "name": "C",
        "type": "input",
        "description": "Binary select input C (MSB) that together with A and B selects which one of outputs Y0-Y7 goes low."
      },
      {
        "number": "4",
        "name": "G2A",
        "type": "input",
        "description": "Active-low enable input; when held high the decoding function is inhibited and all outputs go high."
      },
      {
        "number": "5",
        "name": "G2B",
        "type": "input",
        "description": "Active-low enable input; when held high the decoding function is inhibited and all outputs go high."
      },
      {
        "number": "6",
        "name": "G1",
        "type": "input",
        "description": "Active-high enable input; when held low the decoding function is inhibited and all outputs go high."
      },
      {
        "number": "7",
        "name": "Y7",
        "type": "output",
        "description": "Active-low decoded output 7, goes low when select inputs are H,H,H and the device is enabled."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin (0 V)."
      },
      {
        "number": "9",
        "name": "Y6",
        "type": "output",
        "description": "Active-low decoded output 6, goes low when select inputs C,B,A are H,H,L and the device is enabled."
      },
      {
        "number": "10",
        "name": "Y5",
        "type": "output",
        "description": "Active-low decoded output 5, goes low when select inputs C,B,A are H,L,H and the device is enabled."
      },
      {
        "number": "11",
        "name": "Y4",
        "type": "output",
        "description": "Active-low decoded output 4, goes low when select inputs C,B,A are H,L,L and the device is enabled."
      },
      {
        "number": "12",
        "name": "Y3",
        "type": "output",
        "description": "Active-low decoded output 3, goes low when select inputs C,B,A are L,H,H and the device is enabled."
      },
      {
        "number": "13",
        "name": "Y2",
        "type": "output",
        "description": "Active-low decoded output 2, goes low when select inputs C,B,A are L,H,L and the device is enabled."
      },
      {
        "number": "14",
        "name": "Y1",
        "type": "output",
        "description": "Active-low decoded output 1, goes low when select inputs C,B,A are L,L,H and the device is enabled."
      },
      {
        "number": "15",
        "name": "Y0",
        "type": "output",
        "description": "Active-low decoded output 0, goes low when select inputs C,B,A are L,L,L and the device is enabled."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage, operating range 2 to 6 V (absolute maximum -0.5 to 7 V)."
      }
    ],
    "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": "text+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: MPN suffix 'APF' is not defined in the datasheet; it was assumed to be the DIP16 TC74HC138AP (the (F",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 9,
        "cost_usd": 0.2456,
        "at": "2026-10-16T13:10:02"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588928751443333120",
        "pages": 9,
        "sha256": "00a3ed21625d3d0e",
        "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": "tc74hc138apf.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": "tc74hc138apf-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": "91ecc005f92e46d99ef02fcbbda247778f9c483c98ee54f023a0b2296e411e31",
        "checked": "2026-10-16",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}