CD74HCT688E

{
  "slug": "cd74hct688e",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Pre-ordered Chips, PDIP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "interface ics",
    "cd74hct688e",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "cd74hct688e.kicad_sym",
    "cd74hct688e.kicad_mod",
    "cd74hct688e.glb",
    "cd74hct688e.step",
    "cd74hct688e.lbr",
    "docs/hero.png",
    "docs/cd74hct688e-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "cd74hct688e-hero.glb",
    "cd74hct688e-hero.overlay.json",
    "cd74hct688e-etched.glb"
  ],
  "component": {
    "mpn": "CD74HCT688E",
    "manufacturer": "Texas Instruments",
    "package": "PDIP-20",
    "pin_count": 20,
    "category": "Interface ICs",
    "subcategory": "Pre-ordered Chips",
    "datasheet": "https://www.ti.com/lit/ds/symlink/cd74hct688e.pdf",
    "parts": {
      "symbol": "cd74hct688e.kicad_sym",
      "footprint": "cd74hct688e.kicad_mod",
      "model_3d": "cd74hct688e-hero.glb",
      "model_3d_plain": "cd74hct688e-etched.glb",
      "model_3d_step": "cd74hct688e-etched.step",
      "model_3d_step_plain": "cd74hct688e.step",
      "lbr": "cd74hct688e.lbr"
    },
    "distributor_links": {
      "lcsc": "C1523711",
      "digikey": "296-2131-5-ND",
      "mouser": "595-CD74HCT688E"
    },
    "distributor_check": {
      "checked_at": "2026-10-30T22:49:47Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-2131-5-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-CD74HCT688E",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "E",
        "type": "input",
        "description": "Active-low enable input; when E is high, output Y is forced high regardless of the A and B inputs."
      },
      {
        "number": "2",
        "name": "A0",
        "type": "input",
        "description": "Word A data input bit 0, compared against B0."
      },
      {
        "number": "3",
        "name": "B0",
        "type": "input",
        "description": "Word B data input bit 0, compared against A0."
      },
      {
        "number": "4",
        "name": "A1",
        "type": "input",
        "description": "Word A data input bit 1, compared against B1."
      },
      {
        "number": "5",
        "name": "B1",
        "type": "input",
        "description": "Word B data input bit 1, compared against A1."
      },
      {
        "number": "6",
        "name": "A2",
        "type": "input",
        "description": "Word A data input bit 2, compared against B2."
      },
      {
        "number": "7",
        "name": "B2",
        "type": "input",
        "description": "Word B data input bit 2, compared against A2."
      },
      {
        "number": "8",
        "name": "A3",
        "type": "input",
        "description": "Word A data input bit 3, compared against B3."
      },
      {
        "number": "9",
        "name": "B3",
        "type": "input",
        "description": "Word B data input bit 3, compared against A3."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device."
      },
      {
        "number": "11",
        "name": "A4",
        "type": "input",
        "description": "Word A data input bit 4, compared against B4."
      },
      {
        "number": "12",
        "name": "B4",
        "type": "input",
        "description": "Word B data input bit 4, compared against A4."
      },
      {
        "number": "13",
        "name": "A5",
        "type": "input",
        "description": "Word A data input bit 5, compared against B5."
      },
      {
        "number": "14",
        "name": "B5",
        "type": "input",
        "description": "Word B data input bit 5, compared against A5."
      },
      {
        "number": "15",
        "name": "A6",
        "type": "input",
        "description": "Word A data input bit 6, compared against B6."
      },
      {
        "number": "16",
        "name": "B6",
        "type": "input",
        "description": "Word B data input bit 6, compared against A6."
      },
      {
        "number": "17",
        "name": "A7",
        "type": "input",
        "description": "Word A data input bit 7, compared against B7."
      },
      {
        "number": "18",
        "name": "B7",
        "type": "input",
        "description": "Word B data input bit 7, compared against A7."
      },
      {
        "number": "19",
        "name": "Y",
        "type": "output",
        "description": "Comparator output, low when A equals B and E is low, usable as enable input to a cascaded device."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage, 4.5 V to 5.5 V for HCT types, with a 0.1-µF bypass capacitor recommended."
      }
    ],
    "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": [
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 26,
        "cost_usd": 0.491,
        "at": "2026-10-30T22:49:37"
      },
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/cd74hct688e.pdf",
        "pages": 26,
        "sha256": "871c1ed3b22e27bf",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "cd74hct688e.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,
          26.162,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "ca359c9b9e0ce94efcb6c96866513f659eef6517d629ace3c4a0a779f6fd57bb",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "cd74hct688e-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,
          26.162,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "bc2e1d4a4b5d29b4fb8b26b329d380494501edb927d26d3cc5ac99fa490bb575",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}