SN74HC157

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn74hc157",
  "title": "SN74HC157",
  "brief": "TI quad 2-to-1 data selector/multiplexer, SOIC-16. One select routes one of two 4-bit inputs, enable. HC 2-6 V. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "multiplexer",
    "data-selector",
    "74hc",
    "soic-16",
    "texas-instruments"
  ],
  "component": {
    "mpn": "SN74HC157",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Multiplexer",
    "subcategory": "Quad 2-to-1 multiplexer",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sn74hc157.pdf",
    "parts": {
      "symbol": "sn74hc157.kicad_sym",
      "footprint": "sn74hc157.kicad_mod",
      "model_3d": "sn74hc157-etched.glb",
      "model_3d_plain": "sn74hc157.glb",
      "lbr": "sn74hc157.lbr",
      "model_3d_step": "sn74hc157-etched.step",
      "model_3d_step_plain": "sn74hc157.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "A/B",
        "type": "input",
        "description": "Address select input (A/B, active-low means low selects A, high selects B). Standard CMOS input; when G is low, Y follows selected A or B input for all four channels."
      },
      {
        "number": "2",
        "name": "1A",
        "type": "input",
        "description": "Channel 1 data input A. Routed to 1Y when A/B is low and G is low."
      },
      {
        "number": "3",
        "name": "1B",
        "type": "input",
        "description": "Channel 1 data input B. Routed to 1Y when A/B is high and G is low."
      },
      {
        "number": "4",
        "name": "1Y",
        "type": "output",
        "description": "Channel 1 data output. Drives the selected A or B input; forced low when G is high. ±6mA drive at 5V."
      },
      {
        "number": "5",
        "name": "2A",
        "type": "input",
        "description": "Channel 2 data input A. Routed to 2Y when A/B is low and G is low."
      },
      {
        "number": "6",
        "name": "2B",
        "type": "input",
        "description": "Channel 2 data input B. Routed to 2Y when A/B is high and G is low."
      },
      {
        "number": "7",
        "name": "2Y",
        "type": "output",
        "description": "Channel 2 data output. Drives the selected A or B input; forced low when G is high."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference, 0V. Continuous current through VCC or GND is limited to ±70mA (absolute max)."
      },
      {
        "number": "9",
        "name": "3Y",
        "type": "output",
        "description": "Channel 3 data output. Drives the selected A or B input; forced low when G is high."
      },
      {
        "number": "10",
        "name": "3B",
        "type": "input",
        "description": "Channel 3 data input B. Routed to 3Y when A/B is high and G is low."
      },
      {
        "number": "11",
        "name": "3A",
        "type": "input",
        "description": "Channel 3 data input A. Routed to 3Y when A/B is low and G is low."
      },
      {
        "number": "12",
        "name": "4Y",
        "type": "output",
        "description": "Channel 4 data output. Drives the selected A or B input; forced low when G is high."
      },
      {
        "number": "13",
        "name": "4B",
        "type": "input",
        "description": "Channel 4 data input B. Routed to 4Y when A/B is high and G is low."
      },
      {
        "number": "14",
        "name": "4A",
        "type": "input",
        "description": "Channel 4 data input A. Routed to 4Y when A/B is low and G is low."
      },
      {
        "number": "15",
        "name": "G",
        "type": "input",
        "description": "Output strobe, active low. When G is high, all four Y outputs are forced low regardless of A/B or data inputs; when G is low the mux operates normally."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply, 2V to 6V recommended (5V nominal). Absolute max 7V. Decouple with 0.1uF close to the pin."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn74hc157.pdf",
        "pages": 37,
        "sha256": "4dcd9386eac88c0e",
        "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": "74HC157",
      "logic_family": "74HC",
      "function_code": "157",
      "function_class": "Multiplexer",
      "function_name": "Quad 2-to-1 Multiplexer",
      "manufacturer": "Texas Instruments",
      "is_specialty": false
    },
    "models_3d": [
      {
        "file": "sn74hc157.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          9.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74hc157-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "1e17e66b941c15e84a102760a331e3124095df267676836bfbf03092245e1c17",
        "checked": "2026-10-26",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Quad 2-to-1 multiplexer",
      "Channels": "4 bits (2:1 each)",
      "Select": "one shared A/B line",
      "Enable": "active-low (forces Y low)",
      "Outputs": "true (non-inverting)",
      "Logic family": "HC (high-speed CMOS)",
      "Supply voltage": "2-6 V",
      "Package": "SOIC-16"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "sn74hc157",
    "74hc157",
    "quad 2 to 1 mux",
    "data selector",
    "4-bit multiplexer"
  ],
  "discovery_pitch": "SN74HC157 quad 2-to-1 multiplexer (SOIC-16) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn74hc157.kicad_sym",
    "sn74hc157.kicad_mod",
    "sn74hc157.glb",
    "sn74hc157.lbr",
    "docs/hero.png",
    "docs/sn74hc157-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn74hc157-etched.step"
  ],
  "variants": [
    {
      "mpn": "SN74HC157D (SOIC-16, tube)",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC157DR (SOIC-16, tape & reel)",
      "kind": "packaging"
    }
  ]
}