MC74HC138ADTR2G

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  "slug": "mc74hc138adtr2g",
  "title": "MC74HC138ADTR2G",
  "brief": "onsemi Signal Switches / Encoders & Decoders / Multiplexers, TSSOP-16. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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    "mc74hc138adtr2g"
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  "component": {
    "mpn": "MC74HC138ADTR2G",
    "manufacturer": "onsemi",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches / Encoders & Decoders / Multiplexers",
    "datasheet": "https://www.onsemi.com/pdf/datasheet/mc74hc138adtr2-d.pdf",
    "parts": {
      "symbol": "mc74hc138adtr2g.kicad_sym",
      "footprint": "mc74hc138adtr2g.kicad_mod",
      "model_3d": "mc74hc138adtr2g-etched.glb",
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      "model_3d_step": "mc74hc138adtr2g-etched.step",
      "model_3d_step_plain": "mc74hc138adtr2g.step",
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    "pins": [
      {
        "number": "1",
        "name": "A0",
        "type": "input",
        "description": "Address input bit 0. Together with A1 and A2, selects which of the eight Y outputs is driven low when the chip is enabled."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "Address input bit 1. Together with A0 and A2, selects which of the eight Y outputs is driven low when the chip is enabled."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "input",
        "description": "Address input bit 2. Together with A0 and A1, selects which of the eight Y outputs is driven low when the chip is enabled."
      },
      {
        "number": "4",
        "name": "CS2",
        "type": "input",
        "description": "Chip-select input 2 (active-low). Must be low, along with CS3 low and CS1 high, for the chip to be selected and outputs to follow the address inputs."
      },
      {
        "number": "5",
        "name": "CS3",
        "type": "input",
        "description": "Chip-select input 3 (active-low). Must be low, along with CS2 low and CS1 high, for the chip to be selected and outputs to follow the address inputs."
      },
      {
        "number": "6",
        "name": "CS1",
        "type": "input",
        "description": "Chip-select input 1 (active-high). Must be high, along with CS2 and CS3 low, for the chip to be selected and outputs to follow the address inputs."
      },
      {
        "number": "7",
        "name": "Y7",
        "type": "output",
        "description": "Active-low decoded output 7. Drives low when address A2A1A0=111 and the chip is selected; otherwise remains high."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V). Return for VCC supply and all logic signals."
      },
      {
        "number": "9",
        "name": "Y6",
        "type": "output",
        "description": "Active-low decoded output 6. Drives low when address A2A1A0=110 and the chip is selected; otherwise remains high."
      },
      {
        "number": "10",
        "name": "Y5",
        "type": "output",
        "description": "Active-low decoded output 5. Drives low when address A2A1A0=101 and the chip is selected; otherwise remains high."
      },
      {
        "number": "11",
        "name": "Y4",
        "type": "output",
        "description": "Active-low decoded output 4. Drives low when address A2A1A0=100 and the chip is selected; otherwise remains high."
      },
      {
        "number": "12",
        "name": "Y3",
        "type": "output",
        "description": "Active-low decoded output 3. Drives low when address A2A1A0=011 and the chip is selected; otherwise remains high."
      },
      {
        "number": "13",
        "name": "Y2",
        "type": "output",
        "description": "Active-low decoded output 2. Drives low when address A2A1A0=010 and the chip is selected; otherwise remains high."
      },
      {
        "number": "14",
        "name": "Y1",
        "type": "output",
        "description": "Active-low decoded output 1. Drives low when address A2A1A0=001 and the chip is selected; otherwise remains high."
      },
      {
        "number": "15",
        "name": "Y0",
        "type": "output",
        "description": "Active-low decoded output 0. Drives low when address A2A1A0=000 and the chip is selected; otherwise remains high."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage, 2.0 V to 6.0 V (referenced to GND). Absolute maximum 7.0 V."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.onsemi.com/pdf/datasheet/mc74hc138adtr2-d.pdf",
        "pages": 10,
        "sha256": "12975c730cca4e3e",
        "source_tier": "mfr"
      },
      "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"
    },
    "logic": {
      "family_id": "74HC138",
      "logic_family": "74HC",
      "function_code": "138",
      "function_class": "Decoder",
      "function_name": "3-to-8 Line Decoder/Demultiplexer",
      "manufacturer": "Onsemi (Motorola legacy)",
      "is_specialty": false
    }
  },
  "metadata": {
    "specs": {
      "Manufacturer": "onsemi",
      "Package": "TSSOP-16",
      "Category": "Logic",
      "Pins": "16"
    }
  },
  "variants": [
    {
      "mpn": "MC74HC138ADTR2G",
      "kind": "packaging"
    },
    {
      "mpn": "MC74HC138ADTR2GNLV74HC138ADTR2G",
      "kind": "packaging"
    },
    {
      "mpn": "MC74HC138ADTR2GDG",
      "kind": "packaging"
    },
    {
      "mpn": "MC74HC138ADTR2GDR2G",
      "kind": "packaging"
    },
    {
      "mpn": "MC74HC138ADG",
      "kind": "unknown"
    },
    {
      "mpn": "MC74HC138ADR2G",
      "kind": "unknown"
    },
    {
      "mpn": "MC74HC138ADTR2GNLV74HC138ADR2G",
      "kind": "packaging"
    },
    {
      "mpn": "MC74HC138ADTR2GNG",
      "kind": "packaging"
    },
    {
      "mpn": "MC74HC138ANG",
      "kind": "unknown"
    }
  ],
  "sections": [
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  "discovery_triggers": [
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  "discovery_pitch": "MC74HC138ADTR2G (onsemi) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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    "path": "docs/hero.png"
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  "visibility": {
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  "updated_at": "2026-09-28T18:51:46.078Z"
}