SN74HC373

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn74hc373",
  "title": "SN74HC373",
  "brief": "TI octal transparent D latch with 3-state outputs, SOIC-20. Latch-enable + output-enable, 2-6 V. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "logic",
    "latch",
    "transparent-latch",
    "74hc",
    "soic-20",
    "texas-instruments"
  ],
  "component": {
    "mpn": "SN74HC373",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-20",
    "pin_count": 20,
    "category": "Logic IC",
    "subcategory": "Octal transparent D latch (3-state)",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sn74hc373.pdf",
    "parts": {
      "symbol": "sn74hc373.kicad_sym",
      "footprint": "sn74hc373.kicad_mod",
      "model_3d": "sn74hc373-etched.glb",
      "model_3d_plain": "sn74hc373.glb",
      "lbr": "sn74hc373.lbr",
      "model_3d_step": "sn74hc373-etched.step",
      "model_3d_step_plain": "sn74hc373.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "OE",
        "type": "input",
        "description": "Active-low output enable. When low, the Q outputs are actively driven; when high, all Q outputs are placed in the high-impedance (3-state) state. Does not affect the stored latch state."
      },
      {
        "number": "2",
        "name": "1Q",
        "type": "tri_state",
        "description": "3-state output for latch channel 1. Drives ±6 mA at 5 V; enters Hi-Z when OE is high."
      },
      {
        "number": "3",
        "name": "1D",
        "type": "input",
        "description": "Data input for latch channel 1. Passes to 1Q while LE is high; captured on LE falling edge."
      },
      {
        "number": "4",
        "name": "2D",
        "type": "input",
        "description": "Data input for latch channel 2. Passes to 2Q while LE is high; captured on LE falling edge."
      },
      {
        "number": "5",
        "name": "2Q",
        "type": "tri_state",
        "description": "3-state output for latch channel 2. Drives ±6 mA at 5 V; enters Hi-Z when OE is high."
      },
      {
        "number": "6",
        "name": "3Q",
        "type": "tri_state",
        "description": "3-state output for latch channel 3. Drives ±6 mA at 5 V; enters Hi-Z when OE is high."
      },
      {
        "number": "7",
        "name": "3D",
        "type": "input",
        "description": "Data input for latch channel 3. Passes to 3Q while LE is high; captured on LE falling edge."
      },
      {
        "number": "8",
        "name": "4D",
        "type": "input",
        "description": "Data input for latch channel 4. Passes to 4Q while LE is high; captured on LE falling edge."
      },
      {
        "number": "9",
        "name": "4Q",
        "type": "tri_state",
        "description": "3-state output for latch channel 4. Drives ±6 mA at 5 V; enters Hi-Z when OE is high."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V) for the device."
      },
      {
        "number": "11",
        "name": "LE",
        "type": "input",
        "description": "Latch enable, common to all eight latches. When high, Q outputs transparently follow D inputs; when driven low, the D-input state at the falling edge is latched at the outputs. Setup time 15 ns and hold time 13 ns at 4.5 V."
      },
      {
        "number": "12",
        "name": "5Q",
        "type": "tri_state",
        "description": "3-state output for latch channel 5. Drives ±6 mA at 5 V; enters Hi-Z when OE is high."
      },
      {
        "number": "13",
        "name": "5D",
        "type": "input",
        "description": "Data input for latch channel 5. Passes to 5Q while LE is high; captured on LE falling edge."
      },
      {
        "number": "14",
        "name": "6D",
        "type": "input",
        "description": "Data input for latch channel 6. Passes to 6Q while LE is high; captured on LE falling edge."
      },
      {
        "number": "15",
        "name": "6Q",
        "type": "tri_state",
        "description": "3-state output for latch channel 6. Drives ±6 mA at 5 V; enters Hi-Z when OE is high."
      },
      {
        "number": "16",
        "name": "7Q",
        "type": "tri_state",
        "description": "3-state output for latch channel 7. Drives ±6 mA at 5 V; enters Hi-Z when OE is high."
      },
      {
        "number": "17",
        "name": "7D",
        "type": "input",
        "description": "Data input for latch channel 7. Passes to 7Q while LE is high; captured on LE falling edge."
      },
      {
        "number": "18",
        "name": "8D",
        "type": "input",
        "description": "Data input for latch channel 8. Passes to 8Q while LE is high; captured on LE falling edge."
      },
      {
        "number": "19",
        "name": "8Q",
        "type": "tri_state",
        "description": "3-state output for latch channel 8. Drives ±6 mA at 5 V; enters Hi-Z when OE is high."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply. Recommended operating range 2 V to 6 V (absolute max 7 V). Bypass with a local 0.1 µF ceramic to GND."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn74hc373.pdf",
        "pages": 38,
        "sha256": "09faaa55733b1ac6",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "logic": {
      "family_id": "74HC373",
      "logic_family": "74HC",
      "function_code": "373",
      "function_class": "Latch",
      "function_name": "Octal D Latch with 3-State Outputs",
      "manufacturer": "Texas Instruments",
      "is_specialty": false
    },
    "models_3d": [
      {
        "file": "sn74hc373.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          10.3,
          12.8,
          2.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "59a10b341e6972b31d81802a048060326da627d8b92dcf4263064f4f62ec808e",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74hc373-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          10.3,
          12.8,
          2.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "79a0e5065b74351f7c1a06334e2029b9f6ed6e84ffd0e9db1909d096a44d6226",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Octal transparent D latch, 3-state",
      "Latches": "8",
      "Latch enable": "LE (transparent high, hold low)",
      "Output enable": "/OE (active-low, Hi-Z)",
      "Logic family": "HC (high-speed CMOS)",
      "Supply voltage": "2-6 V",
      "Package": "SOIC-20",
      "Body (L×W×H)": "12.8 × 7.5 × 2.35 mm"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "sn74hc373",
    "74hc373",
    "octal latch",
    "transparent latch",
    "address latch"
  ],
  "discovery_pitch": "SN74HC373 octal transparent D latch with 3-state outputs (SOIC-20) 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",
    "sn74hc373.kicad_sym",
    "sn74hc373.kicad_mod",
    "sn74hc373.glb",
    "sn74hc373.lbr",
    "docs/hero.png",
    "docs/sn74hc373-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn74hc373-etched.step"
  ],
  "variants": [
    {
      "mpn": "SN74HC373DW (SOIC-20, tube)",
      "kind": "packaging"
    },
    {
      "mpn": "SN74HC373DWR (SOIC-20, tape & reel)",
      "kind": "packaging"
    }
  ]
}