CD4028B BCD-to-Decimal Decoder

{
  "schema_version": 1,
  "type": "component",
  "slug": "cd4028",
  "title": "CD4028B BCD-to-Decimal Decoder",
  "brief": "BCD-to-decimal (1-of-10) decoder in the 4000B CMOS family, 3 V to 18 V.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "logic",
    "decoder",
    "bcd",
    "4000-series",
    "ti",
    "soic-16"
  ],
  "component": {
    "mpn": "CD4028B",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Decoder / Demultiplexer",
    "datasheet": "https://www.ti.com/lit/ds/symlink/cd4028b.pdf",
    "parts": {
      "symbol": "cd4028.kicad_sym",
      "footprint": "cd4028.kicad_mod",
      "model_3d": "cd4028-etched.glb",
      "model_3d_plain": "cd4028.glb",
      "model_3d_step": "cd4028-etched.step",
      "model_3d_step_plain": "cd4028.step",
      "lbr": "cd4028.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "4",
        "type": "output",
        "description": "Buffered decoded output 4. HIGH when input code DCBA = 0100."
      },
      {
        "number": "2",
        "name": "2",
        "type": "output",
        "description": "Buffered decoded output 2. HIGH when input code DCBA = 0010."
      },
      {
        "number": "3",
        "name": "0",
        "type": "output",
        "description": "Buffered decoded output 0. HIGH when input code DCBA = 0000."
      },
      {
        "number": "4",
        "name": "7",
        "type": "output",
        "description": "Buffered decoded output 7. HIGH when input code DCBA = 0111."
      },
      {
        "number": "5",
        "name": "9",
        "type": "output",
        "description": "Buffered decoded output 9. HIGH when input code DCBA = 1001."
      },
      {
        "number": "6",
        "name": "5",
        "type": "output",
        "description": "Buffered decoded output 5. HIGH when input code DCBA = 0101."
      },
      {
        "number": "7",
        "name": "6",
        "type": "output",
        "description": "Buffered decoded output 6. HIGH when input code DCBA = 0110."
      },
      {
        "number": "8",
        "name": "VSS",
        "type": "power_in",
        "description": "Negative supply / ground reference (0 V)."
      },
      {
        "number": "9",
        "name": "8",
        "type": "output",
        "description": "Buffered decoded output 8. HIGH when input code DCBA = 1000."
      },
      {
        "number": "10",
        "name": "A",
        "type": "input",
        "description": "BCD input A (LSB). Buffered CMOS input; 3-18 V logic levels."
      },
      {
        "number": "11",
        "name": "D",
        "type": "input",
        "description": "BCD input D (MSB). Tie LOW for 3-bit binary-to-octal operation."
      },
      {
        "number": "12",
        "name": "C",
        "type": "input",
        "description": "BCD input C. Buffered CMOS input; 3-18 V logic levels."
      },
      {
        "number": "13",
        "name": "B",
        "type": "input",
        "description": "BCD input B. Buffered CMOS input; 3-18 V logic levels."
      },
      {
        "number": "14",
        "name": "3",
        "type": "output",
        "description": "Buffered decoded output 3. HIGH when input code DCBA = 0011."
      },
      {
        "number": "15",
        "name": "1",
        "type": "output",
        "description": "Buffered decoded output 1. HIGH when input code DCBA = 0001."
      },
      {
        "number": "16",
        "name": "VDD",
        "type": "power_in",
        "description": "Positive supply, 3 V to 18 V (absolute max 20 V)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/cd4028b.pdf",
        "pages": 19,
        "sha256": "f89c5f50a4af474d",
        "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": "CD4028",
      "logic_family": "CD4000",
      "function_code": "4028",
      "function_class": "Decoder",
      "function_name": "BCD-to-Decimal Decoder",
      "manufacturer": "Texas Instruments",
      "is_specialty": false
    },
    "models_3d": [
      {
        "file": "cd4028.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": "cd4028-etched.step",
        "role": "eda",
        "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": "d441dc341183376fdb62b72c834b422781d64f350eb49efcfd0096af3951c9f0",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "BCD-to-decimal (1-of-10) decoder",
      "Logic family": "4000B (CMOS)",
      "Outputs": "10, active-high, mutually exclusive",
      "Supply voltage": "3 V to 18 V",
      "Operating temperature": "-55 C to 125 C"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "BCD to decimal",
    "1-of-10 decoder",
    "BCD decoder",
    "seven-segment scanning"
  ],
  "discovery_pitch": "Decode a 4-bit BCD input to one of ten active-high outputs, running anywhere from 3 V to 18 V.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "cd4028.kicad_sym",
    "cd4028.kicad_mod",
    "cd4028.glb",
    "cd4028.step",
    "cd4028.lbr",
    "docs/hero.png",
    "docs/cd4028-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "cd4028-etched.step"
  ],
  "variants": [
    {
      "mpn": "CD4028BBE",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBE.A",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBEE4",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBF",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBF.A",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBF3A",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBF3A.A",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBM",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBM96",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBM96.A",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBMT",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBNSR",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBNSR.A",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBPW",
      "kind": "unknown"
    },
    {
      "mpn": "CD4028BBPWR",
      "kind": "unknown"
    }
  ]
}