SN74HCS251QPWRQ1

{
  "slug": "sn74hcs251qpwrq1",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Signal Switches, Multiplexers, Decoders, TSSOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
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    "logic",
    "sn74hcs251qpwrq1",
    "factory-2.0.0",
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    "sn74hcs251qpwrq1.lbr",
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  "component": {
    "mpn": "SN74HCS251QPWRQ1",
    "manufacturer": "Texas Instruments",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://www.ti.com/cn/lit/gpn/sn74hcs251-q1",
    "parts": {
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      "lbr": "sn74hcs251qpwrq1.lbr"
    },
    "distributor_links": {
      "lcsc": "C2873263",
      "digikey": "296-SN74HCS251QPWRQ1TR-ND",
      "mouser": "595-SN74HCS251QPWRQ1"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T04:43:05Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-SN74HCS251QPWRQ1TR-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-SN74HCS251QPWRQ1",
        "status": "found"
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    "pins": [
      {
        "number": "1",
        "name": "D3",
        "type": "input",
        "description": "Data input 3 of the 8-to-1 multiplexer, a Schmitt-trigger input whose valid range is 0 V to VCC; unused inputs must be tied to VCC or GND."
      },
      {
        "number": "2",
        "name": "D2",
        "type": "input",
        "description": "Data input 2 of the 8-to-1 multiplexer, a Schmitt-trigger input whose valid range is 0 V to VCC; unused inputs must be tied to VCC or GND."
      },
      {
        "number": "3",
        "name": "D1",
        "type": "input",
        "description": "Data input 1 of the 8-to-1 multiplexer, a Schmitt-trigger input whose valid range is 0 V to VCC; unused inputs must be tied to VCC or GND."
      },
      {
        "number": "4",
        "name": "D0",
        "type": "input",
        "description": "Data input 0 of the 8-to-1 multiplexer, a Schmitt-trigger input whose valid range is 0 V to VCC; unused inputs must be tied to VCC or GND."
      },
      {
        "number": "5",
        "name": "Y",
        "type": "tri_state",
        "description": "True data output of the multiplexer, a balanced CMOS 3-state output that goes to high impedance when OE is high."
      },
      {
        "number": "6",
        "name": "W",
        "type": "tri_state",
        "description": "Inverted data output of the multiplexer, a balanced CMOS 3-state output that goes to high impedance when OE is high."
      },
      {
        "number": "7",
        "name": "OE",
        "type": "input",
        "description": "Active-low output enable; when high it forces both Y and W into the high-impedance state."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device."
      },
      {
        "number": "9",
        "name": "C",
        "type": "input",
        "description": "Address select C, the most significant bit of the 3-bit select code (C B A) that chooses one of D0 to D7; Schmitt-trigger input with a valid range of 0 V to VCC."
      },
      {
        "number": "10",
        "name": "B",
        "type": "input",
        "description": "Address select B, the middle bit of the 3-bit select code (C B A) that chooses one of D0 to D7; Schmitt-trigger input with a valid range of 0 V to VCC."
      },
      {
        "number": "11",
        "name": "A",
        "type": "input",
        "description": "Address select A, the least significant bit of the 3-bit select code (C B A) that chooses one of D0 to D7; Schmitt-trigger input with a valid range of 0 V to VCC."
      },
      {
        "number": "12",
        "name": "D7",
        "type": "input",
        "description": "Data input 7 of the 8-to-1 multiplexer, a Schmitt-trigger input whose valid range is 0 V to VCC; unused inputs must be tied to VCC or GND."
      },
      {
        "number": "13",
        "name": "D6",
        "type": "input",
        "description": "Data input 6 of the 8-to-1 multiplexer, a Schmitt-trigger input whose valid range is 0 V to VCC; unused inputs must be tied to VCC or GND."
      },
      {
        "number": "14",
        "name": "D5",
        "type": "input",
        "description": "Data input 5 of the 8-to-1 multiplexer, a Schmitt-trigger input whose valid range is 0 V to VCC; unused inputs must be tied to VCC or GND."
      },
      {
        "number": "15",
        "name": "D4",
        "type": "input",
        "description": "Data input 4 of the 8-to-1 multiplexer, a Schmitt-trigger input whose valid range is 0 V to VCC; unused inputs must be tied to VCC or GND."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply, recommended operating range 2 V to 6 V (absolute maximum 7 V)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
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        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet pin table (page 3) is for the D (SOIC) and PW (TSSOP) packages. Its figure caption say; Datasheet labels Y and W as 'O' (output). They were mapped to KiCad tri_state because the datasheet ; The datasheet gives no separate per-pin electrical limits beyond the device-level ratings (VCC 2 V t"
        ],
        "pages_sent": 26,
        "cost_usd": 0.0859,
        "at": "2026-10-18T04:37:52"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/sn74hcs251-q1",
        "pages": 26,
        "sha256": "73467702117190ce",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
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}