MC74HC139ADTR2G

{
  "slug": "mc74hc139adtr2g",
  "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",
    "mc74hc139adtr2g",
    "factory-2.0.0",
    "extractor-text"
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  "dependencies": {},
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  "component": {
    "mpn": "MC74HC139ADTR2G",
    "manufacturer": "onsemi",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588930477872439296",
    "parts": {
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      "lbr": "mc74hc139adtr2g.lbr"
    },
    "distributor_links": {
      "lcsc": "C904023"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T15:00:43Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "Selecta",
        "type": "input",
        "description": "Active-low select input for decoder a; a low level lets the a outputs follow the Address inputs, and a high level forces all Y0a to Y3a high."
      },
      {
        "number": "2",
        "name": "A0a",
        "type": "input",
        "description": "Address input bit 0 for decoder a, which determines which of its four active-low outputs is selected when the decoder is enabled."
      },
      {
        "number": "3",
        "name": "A1a",
        "type": "input",
        "description": "Address input bit 1 for decoder a, which determines which of its four active-low outputs is selected when the decoder is enabled."
      },
      {
        "number": "4",
        "name": "Y0a",
        "type": "output",
        "description": "Active-low output 0 of decoder a, which goes low when addressed and Selecta is active and remains high otherwise."
      },
      {
        "number": "5",
        "name": "Y1a",
        "type": "output",
        "description": "Active-low output 1 of decoder a, which goes low when addressed and Selecta is active and remains high otherwise."
      },
      {
        "number": "6",
        "name": "Y2a",
        "type": "output",
        "description": "Active-low output 2 of decoder a, which goes low when addressed and Selecta is active and remains high otherwise."
      },
      {
        "number": "7",
        "name": "Y3a",
        "type": "output",
        "description": "Active-low output 3 of decoder a, which goes low when addressed and Selecta is active and remains high otherwise."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device; all voltages are referenced to this pin."
      },
      {
        "number": "9",
        "name": "Y3b",
        "type": "output",
        "description": "Active-low output 3 of decoder b, which goes low when addressed and Selectb is active and remains high otherwise."
      },
      {
        "number": "10",
        "name": "Y2b",
        "type": "output",
        "description": "Active-low output 2 of decoder b, which goes low when addressed and Selectb is active and remains high otherwise."
      },
      {
        "number": "11",
        "name": "Y1b",
        "type": "output",
        "description": "Active-low output 1 of decoder b, which goes low when addressed and Selectb is active and remains high otherwise."
      },
      {
        "number": "12",
        "name": "Y0b",
        "type": "output",
        "description": "Active-low output 0 of decoder b, which goes low when addressed and Selectb is active and remains high otherwise."
      },
      {
        "number": "13",
        "name": "A1b",
        "type": "input",
        "description": "Address input bit 1 for decoder b, which determines which of its four active-low outputs is selected when the decoder is enabled."
      },
      {
        "number": "14",
        "name": "A0b",
        "type": "input",
        "description": "Address input bit 0 for decoder b, which determines which of its four active-low outputs is selected when the decoder is enabled."
      },
      {
        "number": "15",
        "name": "Selectb",
        "type": "input",
        "description": "Active-low select input for decoder b; a low level lets the b outputs follow the Address inputs, and a high level forces all Y0b to Y3b high."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply pin; the recommended operating range is 2.0 V to 6.0 V referenced to GND."
      }
    ],
    "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 pin-assignment figure text in the extracted datasheet is scrambled (pin numbers and names do not; The datasheet gives one pin assignment for the device family and does not publish a separate TSSOP-s",
          "4/16 pins cited to the wrong page (name found elsewhere): ['5:Y1a@p6', '6:Y2a@p6', '10:Y2b@p6', '11:Y1b@p6']"
        ],
        "pages_sent": 10,
        "cost_usd": 0.0705,
        "at": "2026-10-18T15:00:25"
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      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588930477872439296",
        "pages": 10,
        "sha256": "8d369136b264f5e5",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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}