SN74LVC138APWR

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn74lvc138apwr",
  "title": "SN74LVC138APWR",
  "brief": "Texas Instruments 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",
  "tags": [
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    "logic",
    "sn74lvc138apwr"
  ],
  "component": {
    "mpn": "SN74LVC138APWR",
    "manufacturer": "Texas Instruments",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches / Encoders & Decoders / Multiplexers",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sn74lvc138a.pdf",
    "parts": {
      "symbol": "sn74lvc138apwr.kicad_sym",
      "footprint": "sn74lvc138apwr.kicad_mod",
      "model_3d": "sn74lvc138apwr-etched.glb",
      "model_3d_plain": "sn74lvc138apwr.glb",
      "model_3d_step": "sn74lvc138apwr-etched.step",
      "model_3d_step_plain": "sn74lvc138apwr.step",
      "lbr": "sn74lvc138apwr.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "A",
        "type": "input",
        "description": "Address/select input A (LSB of 3-bit binary select). CMOS input, accepts 0 to 5.5 V regardless of VCC."
      },
      {
        "number": "2",
        "name": "B",
        "type": "input",
        "description": "Address/select input B (middle bit of 3-bit binary select). CMOS input, accepts 0 to 5.5 V regardless of VCC."
      },
      {
        "number": "3",
        "name": "C",
        "type": "input",
        "description": "Address/select input C (MSB of 3-bit binary select). CMOS input, accepts 0 to 5.5 V regardless of VCC."
      },
      {
        "number": "4",
        "name": "G2A",
        "type": "input",
        "description": "Active-low enable input. All outputs are forced high (inactive) when G2A is high."
      },
      {
        "number": "5",
        "name": "G2B",
        "type": "input",
        "description": "Active-low enable input. All outputs are forced high (inactive) when G2B is high."
      },
      {
        "number": "6",
        "name": "G1",
        "type": "input",
        "description": "Active-high enable input. All outputs are forced high (inactive) when G1 is low."
      },
      {
        "number": "7",
        "name": "Y7",
        "type": "output",
        "description": "Active-low decoded output 7. Asserted low when C=1, B=1, A=1 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V)."
      },
      {
        "number": "9",
        "name": "Y6",
        "type": "output",
        "description": "Active-low decoded output 6. Asserted low when C=1, B=1, A=0 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V."
      },
      {
        "number": "10",
        "name": "Y5",
        "type": "output",
        "description": "Active-low decoded output 5. Asserted low when C=1, B=0, A=1 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V."
      },
      {
        "number": "11",
        "name": "Y4",
        "type": "output",
        "description": "Active-low decoded output 4. Asserted low when C=1, B=0, A=0 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V."
      },
      {
        "number": "12",
        "name": "Y3",
        "type": "output",
        "description": "Active-low decoded output 3. Asserted low when C=0, B=1, A=1 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V."
      },
      {
        "number": "13",
        "name": "Y2",
        "type": "output",
        "description": "Active-low decoded output 2. Asserted low when C=0, B=1, A=0 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V."
      },
      {
        "number": "14",
        "name": "Y1",
        "type": "output",
        "description": "Active-low decoded output 1. Asserted low when C=0, B=0, A=1 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V."
      },
      {
        "number": "15",
        "name": "Y0",
        "type": "output",
        "description": "Active-low decoded output 0. Asserted low when C=0, B=0, A=0 and all enables are active. Push-pull CMOS output, ±24 mA drive at VCC=3.3 V."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage, 1.65 V to 3.6 V operating range (absolute max 4.6 V)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn74lvc138a.pdf",
        "pages": 40,
        "sha256": "ac45cc709217a5b8",
        "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": "74LVC138",
      "logic_family": "74LVC",
      "function_code": "138",
      "function_class": "Decoder",
      "function_name": "3-to-8 Line Decoder/Demultiplexer",
      "manufacturer": "Texas Instruments",
      "is_specialty": false
    },
    "models_3d": [
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        "file": "sn74lvc138apwr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          5.0,
          1.1
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "6ad5e98224d02a427d9a6b929a28dbc158b9925fba5adec12db05079f1016948",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74lvc138apwr-etched.step",
        "role": "eda",
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        "origin": "footprint origin = pad-pattern centre",
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
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        "sha256": "8b179976014aac8ccddd2d9daa30bcc43bbf0daab67a6d8a05e54800d5806c75",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "TSSOP-16",
      "Category": "Logic",
      "Pins": "16"
    }
  },
  "variants": [
    {
      "mpn": "SN74LVC138APWR",
      "kind": "packaging"
    },
    {
      "mpn": "SN74LVC138APWRDR",
      "kind": "packaging"
    },
    {
      "mpn": "SN74LVC138APWRD",
      "kind": "packaging"
    },
    {
      "mpn": "SN74LVC138APWRRGYR",
      "kind": "packaging"
    },
    {
      "mpn": "SN74LVC138APWRRGY",
      "kind": "packaging"
    },
    {
      "mpn": "SN74LVC138APWRDBR",
      "kind": "packaging"
    },
    {
      "mpn": "SN74LVC138APWRDB",
      "kind": "packaging"
    }
  ],
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
    "info"
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  "discovery_triggers": [
    "sn74lvc138apwr"
  ],
  "discovery_pitch": "SN74LVC138APWR (Texas Instruments) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
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    "path": "docs/hero.png"
  },
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    "sn74lvc138apwr.glb",
    "sn74lvc138apwr.step",
    "sn74lvc138apwr.lbr",
    "docs/hero.png",
    "docs/sn74lvc138apwr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T07:28:44.246Z"
}