SN74HC237

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn74hc237",
  "title": "SN74HC237",
  "brief": "TI 3-to-8 line decoder/demux with address latch, SOIC-16. Active-high outputs, latch-enable. HC 2-6 V. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "logic",
    "decoder",
    "demultiplexer",
    "latch",
    "74hc",
    "soic-16",
    "texas-instruments"
  ],
  "component": {
    "mpn": "SN74HC237",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Logic IC",
    "subcategory": "3-to-8 decoder with address latch",
    "datasheet": "https://www.ti.com/lit/ds/symlink/cd74hc237.pdf",
    "parts": {
      "symbol": "sn74hc237.kicad_sym",
      "footprint": "sn74hc237.kicad_mod",
      "model_3d": "sn74hc237-etched.glb",
      "model_3d_plain": "sn74hc237.glb",
      "lbr": "sn74hc237.lbr",
      "model_3d_step": "sn74hc237-etched.step",
      "model_3d_step_plain": "sn74hc237.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "A0",
        "type": "input",
        "description": "Address select input bit 0 (LSB). Combined with A1 and A2 selects which of eight Y outputs is driven high. Latched by LE; transparent when LE is low, held on the LE low-to-high transition."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "Address select input bit 1. Combined with A0 and A2 selects which of eight Y outputs is driven high. Latched by LE."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "input",
        "description": "Address select input bit 2 (MSB). Combined with A0 and A1 selects which of eight Y outputs is driven high. Latched by LE."
      },
      {
        "number": "4",
        "name": "LE",
        "type": "input",
        "description": "Latch Enable, active low. When LE is low the address inputs A0-A2 pass transparently to the decoder; on the low-to-high transition of LE the current address is latched and further changes on A0-A2 are ignored."
      },
      {
        "number": "5",
        "name": "~{OE1}",
        "type": "input",
        "description": "Output Enable 1, active low. Must be low together with OE0 high to enable the selected Y output. When high, all outputs are forced to their inactive state (LOW for 'HC237/'HCT237)."
      },
      {
        "number": "6",
        "name": "OE0",
        "type": "input",
        "description": "Output Enable 0, active high. Must be high together with /OE1 low to enable the selected Y output. When low, all outputs are forced to their inactive state (LOW for 'HC237/'HCT237)."
      },
      {
        "number": "7",
        "name": "Y7",
        "type": "output",
        "description": "Decoded output 7 (address 111). Driven HIGH when selected and both enables active; otherwise LOW. Fanout 10 LSTTL loads (standard) / 15 LSTTL loads (bus driver)."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V) for logic and outputs."
      },
      {
        "number": "9",
        "name": "Y6",
        "type": "output",
        "description": "Decoded output 6 (address 110). Driven HIGH when selected and both enables active; otherwise LOW."
      },
      {
        "number": "10",
        "name": "Y5",
        "type": "output",
        "description": "Decoded output 5 (address 101). Driven HIGH when selected and both enables active; otherwise LOW."
      },
      {
        "number": "11",
        "name": "Y4",
        "type": "output",
        "description": "Decoded output 4 (address 100). Driven HIGH when selected and both enables active; otherwise LOW."
      },
      {
        "number": "12",
        "name": "Y3",
        "type": "output",
        "description": "Decoded output 3 (address 011). Driven HIGH when selected and both enables active; otherwise LOW."
      },
      {
        "number": "13",
        "name": "Y2",
        "type": "output",
        "description": "Decoded output 2 (address 010). Driven HIGH when selected and both enables active; otherwise LOW."
      },
      {
        "number": "14",
        "name": "Y1",
        "type": "output",
        "description": "Decoded output 1 (address 001). Driven HIGH when selected and both enables active; otherwise LOW."
      },
      {
        "number": "15",
        "name": "Y0",
        "type": "output",
        "description": "Decoded output 0 (address 000). Driven HIGH when selected and both enables active; otherwise LOW."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply. HC variant: 2 V to 6 V. HCT variant: 4.5 V to 5.5 V. Decouple with a local 0.1 uF ceramic to GND close to the pin."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/cd74hc237.pdf",
        "pages": 27,
        "sha256": "564c040df4c1b784",
        "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": "74HC237",
      "logic_family": "74HC",
      "function_code": "237",
      "function_class": "Decoder",
      "function_name": "3-to-8 Line Decoder with Address Latch",
      "manufacturer": "Texas Instruments",
      "is_specialty": false
    },
    "models_3d": [
      {
        "file": "sn74hc237.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": "sn74hc237-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": "02b56648212d6c917845717aa46f06190c42414f338869f5a8d8c607c6bab838",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "3-to-8 decoder/demux, latched",
      "Address": "3-bit (A0-A2), latchable",
      "Outputs": "8 active-high (Y0-Y7)",
      "Latch": "LE holds the address",
      "Enables": "OE0 + /OE1",
      "Logic family": "HC (high-speed CMOS)",
      "Supply voltage": "2-6 V",
      "Package": "SOIC-16"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "sn74hc237",
    "74hc237",
    "latched decoder",
    "3 to 8 decoder latch",
    "address decoder"
  ],
  "discovery_pitch": "SN74HC237 3-to-8 decoder with address latch (SOIC-16) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn74hc237.kicad_sym",
    "sn74hc237.kicad_mod",
    "sn74hc237.glb",
    "sn74hc237.lbr",
    "docs/hero.png",
    "docs/sn74hc237-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn74hc237-etched.step"
  ],
  "variants": [
    {
      "mpn": "CD74HC237M (SOIC-16, tube)",
      "kind": "unknown"
    },
    {
      "mpn": "CD74HC237M96 (SOIC-16, tape & reel)",
      "kind": "unknown"
    }
  ]
}