SN74HCT540N

{
  "slug": "sn74hct540n",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Buffers / Drivers, PDIP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic ics",
    "sn74hct540n",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn74hct540n.kicad_sym",
    "sn74hct540n.kicad_mod",
    "sn74hct540n.glb",
    "sn74hct540n.step",
    "sn74hct540n.lbr",
    "docs/hero.png",
    "docs/sn74hct540n-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn74hct540n-hero.glb",
    "sn74hct540n-hero.overlay.json",
    "sn74hct540n-etched.glb"
  ],
  "component": {
    "mpn": "SN74HCT540N",
    "manufacturer": "Texas Instruments",
    "package": "PDIP-20",
    "pin_count": 20,
    "category": "Logic ICs",
    "subcategory": "Buffers / Drivers",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sn74hct540n.pdf",
    "parts": {
      "symbol": "sn74hct540n.kicad_sym",
      "footprint": "sn74hct540n.kicad_mod",
      "model_3d": "sn74hct540n-hero.glb",
      "model_3d_plain": "sn74hct540n-etched.glb",
      "model_3d_step": "sn74hct540n-etched.step",
      "model_3d_step_plain": "sn74hct540n.step",
      "lbr": "sn74hct540n.lbr"
    },
    "distributor_links": {
      "lcsc": "C1548086",
      "digikey": "2156-SN74HCT540N-ND",
      "mouser": "595-SN74HCT540N"
    },
    "distributor_check": {
      "checked_at": "2026-10-23T09:21:25Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "2156-SN74HCT540N-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-SN74HCT540N",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "OE1",
        "type": "input",
        "description": "Output-enable 1 input; if either OE1 or OE2 is high, all eight outputs are in the high-impedance state."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "Data input A1, TTL-voltage compatible, inverted at output Y1."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "input",
        "description": "Data input A2, TTL-voltage compatible, inverted at output Y2."
      },
      {
        "number": "4",
        "name": "A3",
        "type": "input",
        "description": "Data input A3, TTL-voltage compatible, inverted at output Y3."
      },
      {
        "number": "5",
        "name": "A4",
        "type": "input",
        "description": "Data input A4, TTL-voltage compatible, inverted at output Y4."
      },
      {
        "number": "6",
        "name": "A5",
        "type": "input",
        "description": "Data input A5, TTL-voltage compatible, inverted at output Y5."
      },
      {
        "number": "7",
        "name": "A6",
        "type": "input",
        "description": "Data input A6, TTL-voltage compatible, inverted at output Y6."
      },
      {
        "number": "8",
        "name": "A7",
        "type": "input",
        "description": "Data input A7, TTL-voltage compatible, inverted at output Y7."
      },
      {
        "number": "9",
        "name": "A8",
        "type": "input",
        "description": "Data input A8, TTL-voltage compatible, inverted at output Y8."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin."
      },
      {
        "number": "11",
        "name": "Y8",
        "type": "tri_state",
        "description": "3-state inverting output for A8, with ±6 mA drive at 5 V."
      },
      {
        "number": "12",
        "name": "Y7",
        "type": "tri_state",
        "description": "3-state inverting output for A7, with ±6 mA drive at 5 V."
      },
      {
        "number": "13",
        "name": "Y6",
        "type": "tri_state",
        "description": "3-state inverting output for A6, with ±6 mA drive at 5 V."
      },
      {
        "number": "14",
        "name": "Y5",
        "type": "tri_state",
        "description": "3-state inverting output for A5, with ±6 mA drive at 5 V."
      },
      {
        "number": "15",
        "name": "Y4",
        "type": "tri_state",
        "description": "3-state inverting output for A4, with ±6 mA drive at 5 V."
      },
      {
        "number": "16",
        "name": "Y3",
        "type": "tri_state",
        "description": "3-state inverting output for A3, with ±6 mA drive at 5 V."
      },
      {
        "number": "17",
        "name": "Y2",
        "type": "tri_state",
        "description": "3-state inverting output for A2, with ±6 mA drive at 5 V."
      },
      {
        "number": "18",
        "name": "Y1",
        "type": "tri_state",
        "description": "3-state inverting output for A1, with ±6 mA drive at 5 V."
      },
      {
        "number": "19",
        "name": "OE2",
        "type": "input",
        "description": "Output-enable 2 input; if either OE1 or OE2 is high, all eight outputs are in the high-impedance state."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage, 4.5 V to 5.5 V operating range."
      }
    ],
    "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",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The pin list was extracted from the text of the page 1 pin diagram, which is a flattened list. Pin n"
        ],
        "pages_sent": 15,
        "cost_usd": 0.1128,
        "at": "2026-10-23T09:21:10"
      },
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn74hct540n.pdf",
        "pages": 15,
        "sha256": "4127bdaaad1a8ace",
        "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"
    },
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        "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": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74hct540n-etched.step",
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        "sha256": "b72e3fddcdfac5634fc0faa7c93704d3528da01ba837a3cb88aba12efa7b6a54",
        "checked": "2026-10-23",
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  }
}