SN74HC154 4-to-16 Decoder

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn74hc154",
  "title": "SN74HC154 4-to-16 Decoder",
  "brief": "4-to-16 line decoder/demultiplexer with 16 active-low outputs.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "logic",
    "decoder",
    "demultiplexer",
    "74hc",
    "ti",
    "soic-24"
  ],
  "component": {
    "mpn": "SN74HC154",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-24",
    "pin_count": 24,
    "category": "Logic",
    "subcategory": "Decoder / Demultiplexer",
    "datasheet": "https://www.ti.com/lit/ds/symlink/cd74hc154.pdf",
    "parts": {
      "symbol": "sn74hc154.kicad_sym",
      "footprint": "sn74hc154.kicad_mod",
      "model_3d": "sn74hc154-etched.glb",
      "model_3d_plain": "sn74hc154.glb",
      "lbr": "sn74hc154.lbr",
      "model_3d_step": "sn74hc154-etched.step",
      "model_3d_step_plain": "sn74hc154.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "Y0",
        "type": "output",
        "description": "Active-low decoder output 0. Driven low when E1=E2=L and A[3:0]=0000; otherwise high."
      },
      {
        "number": "2",
        "name": "Y1",
        "type": "output",
        "description": "Active-low decoder output 1. Driven low when E1=E2=L and A[3:0]=0001."
      },
      {
        "number": "3",
        "name": "Y2",
        "type": "output",
        "description": "Active-low decoder output 2. Driven low when E1=E2=L and A[3:0]=0010."
      },
      {
        "number": "4",
        "name": "Y3",
        "type": "output",
        "description": "Active-low decoder output 3. Driven low when E1=E2=L and A[3:0]=0011."
      },
      {
        "number": "5",
        "name": "Y4",
        "type": "output",
        "description": "Active-low decoder output 4. Driven low when E1=E2=L and A[3:0]=0100."
      },
      {
        "number": "6",
        "name": "Y5",
        "type": "output",
        "description": "Active-low decoder output 5. Driven low when E1=E2=L and A[3:0]=0101."
      },
      {
        "number": "7",
        "name": "Y6",
        "type": "output",
        "description": "Active-low decoder output 6. Driven low when E1=E2=L and A[3:0]=0110."
      },
      {
        "number": "8",
        "name": "Y7",
        "type": "output",
        "description": "Active-low decoder output 7. Driven low when E1=E2=L and A[3:0]=0111."
      },
      {
        "number": "9",
        "name": "Y8",
        "type": "output",
        "description": "Active-low decoder output 8. Driven low when E1=E2=L and A[3:0]=1000."
      },
      {
        "number": "10",
        "name": "Y9",
        "type": "output",
        "description": "Active-low decoder output 9. Driven low when E1=E2=L and A[3:0]=1001."
      },
      {
        "number": "11",
        "name": "Y10",
        "type": "output",
        "description": "Active-low decoder output 10. Driven low when E1=E2=L and A[3:0]=1010."
      },
      {
        "number": "12",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V)."
      },
      {
        "number": "13",
        "name": "Y11",
        "type": "output",
        "description": "Active-low decoder output 11. Driven low when E1=E2=L and A[3:0]=1011."
      },
      {
        "number": "14",
        "name": "Y12",
        "type": "output",
        "description": "Active-low decoder output 12. Driven low when E1=E2=L and A[3:0]=1100."
      },
      {
        "number": "15",
        "name": "Y13",
        "type": "output",
        "description": "Active-low decoder output 13. Driven low when E1=E2=L and A[3:0]=1101."
      },
      {
        "number": "16",
        "name": "Y14",
        "type": "output",
        "description": "Active-low decoder output 14. Driven low when E1=E2=L and A[3:0]=1110."
      },
      {
        "number": "17",
        "name": "Y15",
        "type": "output",
        "description": "Active-low decoder output 15. Driven low when E1=E2=L and A[3:0]=1111."
      },
      {
        "number": "18",
        "name": "E1",
        "type": "input",
        "description": "Active-low enable 1. Both E1 and E2 must be low for a selected output to go low; a high on E1 forces all outputs high. Can be used as data input in demultiplex mode while E2 is held low."
      },
      {
        "number": "19",
        "name": "E2",
        "type": "input",
        "description": "Active-low enable 2. Both E1 and E2 must be low for a selected output to go low; a high on E2 forces all outputs high. Can be used as data input in demultiplex mode while E1 is held low."
      },
      {
        "number": "20",
        "name": "A3",
        "type": "input",
        "description": "Address input bit 3 (MSB) of the 4-bit select code A[3:0] that chooses which of Y0-Y15 is asserted."
      },
      {
        "number": "21",
        "name": "A2",
        "type": "input",
        "description": "Address input bit 2 of the 4-bit select code A[3:0]."
      },
      {
        "number": "22",
        "name": "A1",
        "type": "input",
        "description": "Address input bit 1 of the 4-bit select code A[3:0]."
      },
      {
        "number": "23",
        "name": "A0",
        "type": "input",
        "description": "Address input bit 0 (LSB) of the 4-bit select code A[3:0]."
      },
      {
        "number": "24",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply. HC: 2 V to 6 V. HCT: 4.5 V to 5.5 V."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/cd74hc154.pdf",
        "pages": 14,
        "sha256": "280e5cce6eb56861",
        "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"
    },
    "logic": {
      "family_id": "74HC154",
      "logic_family": "74HC",
      "function_code": "154",
      "function_class": "Decoder",
      "function_name": "4-to-16 Line Decoder/Demultiplexer",
      "manufacturer": "Texas Instruments",
      "is_specialty": false
    },
    "models_3d": [
      {
        "file": "sn74hc154.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          10.3,
          15.4,
          2.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "4b0d20f82f5b0124fecfe11c941274a3c865a30f7baee8b8fadd7df55972d4cd",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74hc154-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          10.3,
          15.4,
          2.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "5bd2bef9d6be4aef01717c759f5fe808afc2de1fdb1fb125c6c8e2674552473c",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "4-to-16 decoder / demultiplexer",
      "Logic family": "74HC (CMOS)",
      "Outputs": "16, active-low, one-of-sixteen",
      "Supply voltage": "2 V to 6 V",
      "Propagation delay": "20 ns typ at 5 V",
      "Operating temperature": "-40 C to 85 C"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "4-to-16 decoder",
    "1-of-16 decoder",
    "demultiplexer",
    "large address decode"
  ],
  "discovery_pitch": "Decode a 4-bit address to one of sixteen active-low outputs, for large memory maps and keypad or display scanning.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn74hc154.kicad_sym",
    "sn74hc154.kicad_mod",
    "sn74hc154.glb",
    "sn74hc154.lbr",
    "docs/hero.png",
    "docs/sn74hc154-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn74hc154-etched.step"
  ],
  "variants": [
    {
      "mpn": "SN74HC154E",
      "kind": "unknown"
    },
    {
      "mpn": "SN74HC154EN",
      "kind": "unknown"
    },
    {
      "mpn": "SN74HC154M",
      "kind": "unknown"
    },
    {
      "mpn": "SN74HC154M96",
      "kind": "unknown"
    },
    {
      "mpn": "SN74HC154F3A",
      "kind": "unknown"
    }
  ]
}