MC74HC251ADTR2G

{
  "slug": "mc74hc251adtr2g",
  "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": [
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    "logic",
    "mc74hc251adtr2g",
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  "component": {
    "mpn": "MC74HC251ADTR2G",
    "manufacturer": "onsemi",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://www.onsemi.com/pdf/datasheet/mc74hc251adtr2-d.pdf",
    "parts": {
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    },
    "distributor_links": {
      "lcsc": "C603264",
      "digikey": "MC74HC251ADTR2GOSTR-ND",
      "mouser": "863-MC74HC251ADTR2G"
    },
    "distributor_check": {
      "checked_at": "2026-10-27T22:07:12Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "MC74HC251ADTR2GOSTR-ND",
        "status": "found"
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      "mouser": {
        "pn": "863-MC74HC251ADTR2G",
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    "pins": [
      {
        "number": "1",
        "name": "D3",
        "type": "input",
        "description": "Data input D3 is one of eight binary data inputs selected by the address inputs to appear at the outputs when Output Enable is low."
      },
      {
        "number": "2",
        "name": "D2",
        "type": "input",
        "description": "Data input D2 is one of eight binary data inputs selected by the address inputs to appear at the outputs when Output Enable is low."
      },
      {
        "number": "3",
        "name": "D1",
        "type": "input",
        "description": "Data input D1 is one of eight binary data inputs selected by the address inputs to appear at the outputs when Output Enable is low."
      },
      {
        "number": "4",
        "name": "D0",
        "type": "input",
        "description": "Data input D0 is one of eight binary data inputs selected by the address inputs to appear at the outputs when Output Enable is low."
      },
      {
        "number": "5",
        "name": "Y",
        "type": "output",
        "description": "True data output Y presents the selected data input and goes to high impedance when Output Enable is high."
      },
      {
        "number": "6",
        "name": "Y̅",
        "type": "output",
        "description": "Complemented data output Y̅ presents the inverted selected data input and goes to high impedance when Output Enable is high."
      },
      {
        "number": "7",
        "name": "OUTPUT ENABLE",
        "type": "input",
        "description": "Output Enable must be held low for the selected data to appear at the outputs, and a high level forces both Y and Y̅ into the high-impedance state."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference pin for the device, with all voltages referenced to GND."
      },
      {
        "number": "9",
        "name": "A2",
        "type": "input",
        "description": "Address input A2 is the most significant bit of the binary address that selects one of the eight data inputs."
      },
      {
        "number": "10",
        "name": "A1",
        "type": "input",
        "description": "Address input A1 is the middle bit of the binary address that selects one of the eight data inputs."
      },
      {
        "number": "11",
        "name": "A0",
        "type": "input",
        "description": "Address input A0 is the least significant bit of the binary address that selects one of the eight data inputs."
      },
      {
        "number": "12",
        "name": "D7",
        "type": "input",
        "description": "Data input D7 is one of eight binary data inputs selected by the address inputs to appear at the outputs when Output Enable is low."
      },
      {
        "number": "13",
        "name": "D6",
        "type": "input",
        "description": "Data input D6 is one of eight binary data inputs selected by the address inputs to appear at the outputs when Output Enable is low."
      },
      {
        "number": "14",
        "name": "D5",
        "type": "input",
        "description": "Data input D5 is one of eight binary data inputs selected by the address inputs to appear at the outputs when Output Enable is low."
      },
      {
        "number": "15",
        "name": "D4",
        "type": "input",
        "description": "Data input D4 is one of eight binary data inputs selected by the address inputs to appear at the outputs when Output Enable is low."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply pin, with the device specified for a DC supply voltage of 2.0 V to 6.0 V referenced to GND."
      }
    ],
    "provenance": {
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        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
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        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin assignment figure on page 1 is garbled in text extraction. Pin numbers were taken from the page "
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        "pages_sent": 8,
        "cost_usd": 0.0516,
        "at": "2026-10-27T22:06:57"
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        "url": "https://www.onsemi.com/pdf/datasheet/mc74hc251adtr2-d.pdf",
        "pages": 8,
        "sha256": "7299a178753bd5db",
        "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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}