SN74HC251PW

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn74hc251pw",
  "title": "SN74HC251PW",
  "brief": "Texas Instruments Signal Switches, Multiplexers, Decoders, TSSOP-16. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "logic",
    "sn74hc251pw"
  ],
  "component": {
    "mpn": "SN74HC251PW",
    "manufacturer": "Texas Instruments",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sn74hc251.pdf",
    "parts": {
      "symbol": "sn74hc251pw.kicad_sym",
      "footprint": "sn74hc251pw.kicad_mod",
      "model_3d": "sn74hc251pw-etched.glb",
      "model_3d_plain": "sn74hc251pw.glb",
      "model_3d_step": "sn74hc251pw-etched.step",
      "model_3d_step_plain": "sn74hc251pw.step",
      "lbr": "sn74hc251pw.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "D3",
        "type": "input",
        "description": "Data input D3. Routed to the Y/W outputs when the select code (C,B,A) = (0,1,1) and /OE is low. CMOS logic input, VIH/VIL per VCC (e.g. 3.15 V/1.35 V at VCC = 4.5 V), input current ±1 μA max."
      },
      {
        "number": "2",
        "name": "D2",
        "type": "input",
        "description": "Data input D2. Selected to the outputs when (C,B,A) = (0,1,0) and /OE is low. Standard HC-family CMOS input."
      },
      {
        "number": "3",
        "name": "D1",
        "type": "input",
        "description": "Data input D1. Selected to the outputs when (C,B,A) = (0,0,1) and /OE is low. Standard HC-family CMOS input."
      },
      {
        "number": "4",
        "name": "D0",
        "type": "input",
        "description": "Data input D0. Selected to the outputs when (C,B,A) = (0,0,0) and /OE is low. Standard HC-family CMOS input."
      },
      {
        "number": "5",
        "name": "Y",
        "type": "tri_state",
        "description": "True (non-inverted) 3-state data output. Drives the selected Dn value; goes to high-impedance (Z) when /OE is high. ±6 mA drive at VCC = 5 V; interfaces directly with system bus or drives up to 15 LSTTL loads."
      },
      {
        "number": "6",
        "name": "W",
        "type": "tri_state",
        "description": "Complementary (inverted) 3-state data output. Drives the logical inverse of the selected Dn; goes to high-impedance (Z) when /OE is high. ±6 mA drive at VCC = 5 V."
      },
      {
        "number": "7",
        "name": "/OE",
        "type": "input",
        "description": "Active-low output enable (strobe). When high, both Y and W outputs are placed in the high-impedance (3-state) state regardless of select or data inputs; when low, the selected Dn drives Y (true) and W (inverted). Standard CMOS input, ±1 μA max input current."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference (0 V). All input/output voltages are referenced to this pin. Tie to system ground with a low-impedance return; place bypass capacitor between VCC (pin 16) and GND close to the device."
      },
      {
        "number": "9",
        "name": "A",
        "type": "input",
        "description": "Select input A (LSB of the 3-bit binary select code A/B/C that chooses one of D0-D7). Standard HC-family CMOS input; all unused inputs must be tied to VCC or GND."
      },
      {
        "number": "10",
        "name": "B",
        "type": "input",
        "description": "Select input B (middle bit of the 3-bit select code). CMOS logic input."
      },
      {
        "number": "11",
        "name": "C",
        "type": "input",
        "description": "Select input C (MSB of the 3-bit select code). CMOS logic input."
      },
      {
        "number": "12",
        "name": "D7",
        "type": "input",
        "description": "Data input D7. Selected to the outputs when (C,B,A) = (1,1,1) and /OE is low. Standard HC-family CMOS input."
      },
      {
        "number": "13",
        "name": "D6",
        "type": "input",
        "description": "Data input D6. Selected to the outputs when (C,B,A) = (1,1,0) and /OE is low. Standard HC-family CMOS input."
      },
      {
        "number": "14",
        "name": "D5",
        "type": "input",
        "description": "Data input D5. Selected to the outputs when (C,B,A) = (1,0,1) and /OE is low. Standard HC-family CMOS input."
      },
      {
        "number": "15",
        "name": "D4",
        "type": "input",
        "description": "Data input D4. Selected to the outputs when (C,B,A) = (1,0,0) and /OE is low. Standard HC-family CMOS input."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage, 2 V to 6 V (nominal 5 V). Quiescent ICC of 80 μA max at VCC = 6 V. Bypass with a 0.1 μF ceramic capacitor to GND close to the device (parallel with 1 μF is common)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn74hc251.pdf",
        "pages": null,
        "sha256": "407441728ca2e20f",
        "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": "74HC251",
      "logic_family": "74HC",
      "function_code": "251",
      "function_class": "Multiplexer",
      "function_name": "8-Input Multiplexer, 3-State",
      "manufacturer": "Texas Instruments",
      "is_specialty": false
    },
    "models_3d": [
      {
        "file": "sn74hc251pw.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          5,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "6ad5e98224d02a427d9a6b929a28dbc158b9925fba5adec12db05079f1016948",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74hc251pw-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          5,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "9fed6a1303f47bbaa287e313fd1eaccedba9aa117602222f9ab7f6236a92868c",
        "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": "SN74HC251PW",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWR",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWR1G4",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWT",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWD",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWDR",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWDRG4",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWDT",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWDB",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWDBR",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWN",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWNS",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWNSR",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWJ",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC251PWFK",
      "kind": "packaging"
    }
  ],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "sn74hc251pw"
  ],
  "discovery_pitch": "SN74HC251PW (Texas Instruments) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn74hc251pw.kicad_sym",
    "sn74hc251pw.kicad_mod",
    "sn74hc251pw.glb",
    "sn74hc251pw.step",
    "sn74hc251pw.lbr",
    "docs/hero.png",
    "docs/sn74hc251pw-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T07:04:36.260Z"
}