74LVC257AD

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  "title": "74LVC257AD",
  "brief": "Nexperia Signal Switches / Encoders & Decoders / Multiplexers, SOIC-16. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.1",
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    "mpn": "74LVC257AD",
    "manufacturer": "Nexperia",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches / Encoders & Decoders / Multiplexers",
    "datasheet": "https://assets.nexperia.com/documents/data-sheet/74LVC257AD.pdf",
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    "pins": [
      {
        "number": "1",
        "name": "S",
        "type": "input",
        "description": "Common data select input. LOW selects the nI0 inputs, HIGH selects the nI1 inputs, routed to the respective nY outputs. Schmitt-trigger CMOS input, 5.5 V tolerant."
      },
      {
        "number": "2",
        "name": "1I0",
        "type": "input",
        "description": "Channel 1 data input from source 0. Routed to output 1Y when S is LOW and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant."
      },
      {
        "number": "3",
        "name": "1I1",
        "type": "input",
        "description": "Channel 1 data input from source 1. Routed to output 1Y when S is HIGH and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant."
      },
      {
        "number": "4",
        "name": "1Y",
        "type": "tri_state",
        "description": "Channel 1 3-state multiplexer output. Drives either 1I0 or 1I1 according to S; high-impedance when /OE is HIGH. Rated for 50 Ω transmission-line drive at 85 °C."
      },
      {
        "number": "5",
        "name": "2I0",
        "type": "input",
        "description": "Channel 2 data input from source 0. Routed to output 2Y when S is LOW and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant."
      },
      {
        "number": "6",
        "name": "2I1",
        "type": "input",
        "description": "Channel 2 data input from source 1. Routed to output 2Y when S is HIGH and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant."
      },
      {
        "number": "7",
        "name": "2Y",
        "type": "tri_state",
        "description": "Channel 2 3-state multiplexer output. Drives either 2I0 or 2I1 according to S; high-impedance when /OE is HIGH. Rated for 50 Ω transmission-line drive at 85 °C."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V). Connect to system ground."
      },
      {
        "number": "9",
        "name": "3Y",
        "type": "tri_state",
        "description": "Channel 3 3-state multiplexer output. Drives either 3I0 or 3I1 according to S; high-impedance when /OE is HIGH. Rated for 50 Ω transmission-line drive at 85 °C."
      },
      {
        "number": "10",
        "name": "3I1",
        "type": "input",
        "description": "Channel 3 data input from source 1. Routed to output 3Y when S is HIGH and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant."
      },
      {
        "number": "11",
        "name": "3I0",
        "type": "input",
        "description": "Channel 3 data input from source 0. Routed to output 3Y when S is LOW and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant."
      },
      {
        "number": "12",
        "name": "4Y",
        "type": "tri_state",
        "description": "Channel 4 3-state multiplexer output. Drives either 4I0 or 4I1 according to S; high-impedance when /OE is HIGH. Rated for 50 Ω transmission-line drive at 85 °C."
      },
      {
        "number": "13",
        "name": "4I1",
        "type": "input",
        "description": "Channel 4 data input from source 1. Routed to output 4Y when S is HIGH and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant."
      },
      {
        "number": "14",
        "name": "4I0",
        "type": "input",
        "description": "Channel 4 data input from source 0. Routed to output 4Y when S is LOW and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant."
      },
      {
        "number": "15",
        "name": "/OE",
        "type": "input",
        "description": "3-state output enable input, active LOW. When HIGH, all nY outputs are placed into the high-impedance state; when LOW, outputs follow the selected inputs. Schmitt-trigger CMOS input, 5.5 V tolerant."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage. Recommended operating range 1.65 V to 3.6 V (functional down to 1.2 V); absolute maximum 6.5 V. Decouple locally to GND."
      }
    ],
    "provenance": {
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      "datasheet": {
        "url": "https://assets.nexperia.com/documents/data-sheet/74LVC257AD.pdf",
        "pages": 14,
        "sha256": "3a23e9adf4d0e855",
        "source_tier": "mfr"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
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        "refuses_to_fabricate": true
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      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-16_3.9x9.9mm_P1.27mm@sha256:f9b5075740f7816c",
      "mark": "drawn"
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    "logic": {
      "family_id": "74LVC257",
      "logic_family": "74LVC",
      "function_code": "257",
      "function_class": "Multiplexer",
      "function_name": "Quad 2-Input Multiplexer, 3-State",
      "manufacturer": null,
      "is_specialty": false
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Nexperia",
      "Package": "SOIC-16",
      "Category": "Logic",
      "Pins": "16"
    }
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  "author": {
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  "updated_at": "2026-09-24T15:15:10.486Z",
  "description": "Nexperia Signal Switches / Encoders & Decoders / Multiplexers, SOIC-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.",
  "org": "adom"
}