CD40257BM

{
  "slug": "cd40257bm",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "cd40257bm",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "cd40257bm.kicad_sym",
    "cd40257bm.kicad_mod",
    "cd40257bm.glb",
    "cd40257bm.step",
    "cd40257bm.lbr",
    "docs/hero.png",
    "docs/cd40257bm-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "cd40257bm-hero.glb",
    "cd40257bm-hero.overlay.json"
  ],
  "component": {
    "mpn": "CD40257BM",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://www.ti.com/cn/lit/gpn/cd40257b",
    "parts": {
      "symbol": "cd40257bm.kicad_sym",
      "footprint": "cd40257bm.kicad_mod",
      "model_3d": "cd40257bm-hero.glb",
      "model_3d_plain": "cd40257bm.glb",
      "model_3d_step": "cd40257bm-etched.step",
      "model_3d_step_plain": "cd40257bm.step",
      "lbr": "cd40257bm.lbr"
    },
    "distributor_links": {
      "lcsc": 2862216,
      "digikey": "2156-CD40257BM-ND",
      "mouser": "595-CD40257BM"
    },
    "distributor_check": {
      "checked_at": "2026-10-05T19:55:16Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "2156-CD40257BM-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-CD40257BM",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "INPUT SELECT",
        "type": "input",
        "description": "Select input: low passes the A inputs to the outputs, high passes the B inputs."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "Channel 1 data input A, routed to D1 when select is low."
      },
      {
        "number": "3",
        "name": "B1",
        "type": "input",
        "description": "Channel 1 data input B, routed to D1 when select is high."
      },
      {
        "number": "4",
        "name": "D1",
        "type": "tri_state",
        "description": "Channel 1 three-state output, high impedance when output disable is high."
      },
      {
        "number": "5",
        "name": "A2",
        "type": "input",
        "description": "Channel 2 data input A, routed to D2 when select is low."
      },
      {
        "number": "6",
        "name": "B2",
        "type": "input",
        "description": "Channel 2 data input B, routed to D2 when select is high."
      },
      {
        "number": "7",
        "name": "D2",
        "type": "tri_state",
        "description": "Channel 2 three-state output, high impedance when output disable is high."
      },
      {
        "number": "8",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground (negative supply) reference terminal for all voltages."
      },
      {
        "number": "9",
        "name": "D3",
        "type": "tri_state",
        "description": "Channel 3 three-state output, high impedance when output disable is high."
      },
      {
        "number": "10",
        "name": "B3",
        "type": "input",
        "description": "Channel 3 data input B, routed to D3 when select is high."
      },
      {
        "number": "11",
        "name": "A3",
        "type": "input",
        "description": "Channel 3 data input A, routed to D3 when select is low."
      },
      {
        "number": "12",
        "name": "D4",
        "type": "tri_state",
        "description": "Channel 4 three-state output, high impedance when output disable is high."
      },
      {
        "number": "13",
        "name": "B4",
        "type": "input",
        "description": "Channel 4 data input B, routed to D4 when select is high."
      },
      {
        "number": "14",
        "name": "A4",
        "type": "input",
        "description": "Channel 4 data input A, routed to D4 when select is low."
      },
      {
        "number": "15",
        "name": "OUTPUT DISABLE",
        "type": "input",
        "description": "3-state output disable: high puts all outputs in high impedance, low enables them."
      },
      {
        "number": "16",
        "name": "VDD",
        "type": "power_in",
        "description": "Positive supply, recommended 3 V to 18 V, absolute maximum -0.5 V to +20 V."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin numbers were read from the functional diagram on page 1, which is a low-quality scan. The datash",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 10,
        "cost_usd": 0.2837,
        "at": "2026-10-05T19:55:00"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/cd40257b",
        "pages": 10,
        "sha256": "d9965b2fa9121640",
        "source_tier": "lcsc"
      },
      "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"
    }
  }
}