PCAL9555APW

{
  "slug": "pcal9555apw",
  "version": "0.1.0",
  "type": "component",
  "description": "NXP Semicon I/O Expanders, TSSOP-24. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "communication interface chip-uart-485-232",
    "pcal9555apw",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "pcal9555apw.kicad_sym",
    "pcal9555apw.kicad_mod",
    "pcal9555apw.glb",
    "pcal9555apw.step",
    "pcal9555apw.lbr",
    "docs/hero.png",
    "docs/pcal9555apw-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "pcal9555apw-hero.glb",
    "pcal9555apw-hero.overlay.json",
    "pcal9555apw-etched.glb"
  ],
  "component": {
    "mpn": "PCAL9555APW",
    "manufacturer": "NXP Semicon",
    "package": "TSSOP-24",
    "pin_count": 24,
    "category": "Communication Interface Chip/UART/485/232",
    "subcategory": "I/O Expanders",
    "datasheet": "https://www.nxp.com/docs/en/data-sheet/PCAL9555A.pdf",
    "parts": {
      "symbol": "pcal9555apw.kicad_sym",
      "footprint": "pcal9555apw.kicad_mod",
      "model_3d": "pcal9555apw-hero.glb",
      "model_3d_plain": "pcal9555apw-etched.glb",
      "model_3d_step": "pcal9555apw-etched.step",
      "model_3d_step_plain": "pcal9555apw.step",
      "lbr": "pcal9555apw.lbr"
    },
    "distributor_links": {
      "lcsc": "C2669740"
    },
    "distributor_check": {
      "checked_at": "2026-10-28T23:05:06Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "INT",
        "type": "output",
        "description": "Interrupt output. Connect to VDD through a pull-up resistor."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "Address input 1. Connect directly to VDD or VSS."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "input",
        "description": "Address input 2. Connect directly to VDD or VSS."
      },
      {
        "number": "4",
        "name": "P0_0",
        "type": "bidirectional",
        "description": "Port 0 input/output 0."
      },
      {
        "number": "5",
        "name": "P0_1",
        "type": "bidirectional",
        "description": "Port 0 input/output 1."
      },
      {
        "number": "6",
        "name": "P0_2",
        "type": "bidirectional",
        "description": "Port 0 input/output 2."
      },
      {
        "number": "7",
        "name": "P0_3",
        "type": "bidirectional",
        "description": "Port 0 input/output 3."
      },
      {
        "number": "8",
        "name": "P0_4",
        "type": "bidirectional",
        "description": "Port 0 input/output 4."
      },
      {
        "number": "9",
        "name": "P0_5",
        "type": "bidirectional",
        "description": "Port 0 input/output 5."
      },
      {
        "number": "10",
        "name": "P0_6",
        "type": "bidirectional",
        "description": "Port 0 input/output 6."
      },
      {
        "number": "11",
        "name": "P0_7",
        "type": "bidirectional",
        "description": "Port 0 input/output 7."
      },
      {
        "number": "12",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "13",
        "name": "P1_0",
        "type": "bidirectional",
        "description": "Port 1 input/output 0."
      },
      {
        "number": "14",
        "name": "P1_1",
        "type": "bidirectional",
        "description": "Port 1 input/output 1."
      },
      {
        "number": "15",
        "name": "P1_2",
        "type": "bidirectional",
        "description": "Port 1 input/output 2."
      },
      {
        "number": "16",
        "name": "P1_3",
        "type": "bidirectional",
        "description": "Port 1 input/output 3."
      },
      {
        "number": "17",
        "name": "P1_4",
        "type": "bidirectional",
        "description": "Port 1 input/output 4."
      },
      {
        "number": "18",
        "name": "P1_5",
        "type": "bidirectional",
        "description": "Port 1 input/output 5."
      },
      {
        "number": "19",
        "name": "P1_6",
        "type": "bidirectional",
        "description": "Port 1 input/output 6."
      },
      {
        "number": "20",
        "name": "P1_7",
        "type": "bidirectional",
        "description": "Port 1 input/output 7."
      },
      {
        "number": "21",
        "name": "A0",
        "type": "input",
        "description": "Address input 0. Connect directly to VDD or VSS."
      },
      {
        "number": "22",
        "name": "SCL",
        "type": "input",
        "description": "Serial clock bus. Connect to VDD through a pull-up resistor."
      },
      {
        "number": "23",
        "name": "SDA",
        "type": "bidirectional",
        "description": "Serial data bus. Connect to VDD through a pull-up resistor."
      },
      {
        "number": "24",
        "name": "VDD",
        "type": "power_in",
        "description": "Supply voltage."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "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: Pin types were mapped from the datasheet's I/O codes to KiCad ERC classes: I/O pins to bidirectional; Table 3 gives only one-line descriptions for most pins. The datasheet states no further limits for t"
        ],
        "pages_sent": 7,
        "cost_usd": 0.0532,
        "at": "2026-10-28T23:04:52"
      },
      "datasheet": {
        "url": "https://www.nxp.com/docs/en/data-sheet/PCAL9555A.pdf",
        "pages": 46,
        "sha256": "76a60b066b420e86",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 24,
        "described": 24,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "pcal9555apw.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          7.8,
          0.97
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "706322f42d9793ebf28d5b80100a68bfa8769998a00b78acadf7af937fc1454f",
        "checked": "2026-10-28",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "pcal9555apw-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          7.8,
          0.97
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "b2d842253bc6a9f11562f6578d26e43683ab493ec88d52261a2724bde21f0edd",
        "checked": "2026-10-28",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ],
    "package_dims": {
      "package_code": "SOT355-1",
      "source_page": 36,
      "D": {
        "nom_mm": 7.8,
        "range_mm": [
          7.7,
          7.9
        ]
      },
      "E1": {
        "nom_mm": 4.4,
        "range_mm": [
          4.3,
          4.5
        ]
      },
      "E": {
        "nom_mm": 6.4,
        "range_mm": [
          6.2,
          6.6
        ]
      },
      "e": {
        "nom_mm": 0.65,
        "range_mm": [
          null,
          null
        ]
      },
      "A": {
        "nom_mm": 1.1,
        "range_mm": [
          null,
          1.1
        ]
      },
      "source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
      "model_check": {
        "file": "pcal9555apw.step",
        "verdict": "PASS",
        "reasons": [
          "height and body within the datasheet's package drawing"
        ],
        "by": "factory/package_fit.py"
      }
    }
  }
}