CD74HCT243M

{
  "schema_version": 1,
  "type": "component",
  "slug": "cd74hct243m",
  "title": "CD74HCT243M",
  "brief": "Texas Instruments Buffers, Drivers, Receivers, Transceivers, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "logic",
    "cd74hct243m",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "CD74HCT243M",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-14",
    "pin_count": 14,
    "category": "Logic",
    "subcategory": "Buffers, Drivers, Receivers, Transceivers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/cd74hct243",
    "parts": {
      "symbol": "cd74hct243m.kicad_sym",
      "footprint": "cd74hct243m.kicad_mod",
      "model_3d": "cd74hct243m-etched.glb",
      "model_3d_plain": "cd74hct243m.glb",
      "model_3d_step": "cd74hct243m-etched.step",
      "model_3d_step_plain": "cd74hct243m.step",
      "lbr": "cd74hct243m.lbr"
    },
    "distributor_links": {
      "lcsc": "C1548352",
      "digikey": "296-26025-5-ND",
      "mouser": "595-CD74HCT243M"
    },
    "distributor_check": {
      "checked_at": "2026-09-26T20:50:41Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-26025-5-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "595-CD74HCT243M",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "OEB",
        "type": "input",
        "description": "Output-enable B control input; HIGH (with OEA HIGH) enables B-to-A data flow (An = output, Bn = input); LOW (with OEA LOW) enables A-to-B data flow; mixed OEA/OEB states force all I/O to high-Z; VIL = 0.8 V max, VIH = 2 V min (HCT type)."
      },
      {
        "number": "2",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection."
      },
      {
        "number": "3",
        "name": "A0",
        "type": "bidirectional",
        "description": "Port A channel 0 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in B-to-A mode; acts as input in A-to-B mode; high-Z when OEA ≠ OEB."
      },
      {
        "number": "4",
        "name": "A1",
        "type": "bidirectional",
        "description": "Port A channel 1 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in B-to-A mode; acts as input in A-to-B mode; high-Z when OEA ≠ OEB."
      },
      {
        "number": "5",
        "name": "A2",
        "type": "bidirectional",
        "description": "Port A channel 2 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in B-to-A mode; acts as input in A-to-B mode; high-Z when OEA ≠ OEB."
      },
      {
        "number": "6",
        "name": "A3",
        "type": "bidirectional",
        "description": "Port A channel 3 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in B-to-A mode; acts as input in A-to-B mode; high-Z when OEA ≠ OEB."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference; continuous current through GND pin must not exceed ±70 mA."
      },
      {
        "number": "8",
        "name": "B3",
        "type": "bidirectional",
        "description": "Port B channel 3 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in A-to-B mode; acts as input in B-to-A mode; high-Z when OEA ≠ OEB."
      },
      {
        "number": "9",
        "name": "B2",
        "type": "bidirectional",
        "description": "Port B channel 2 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in A-to-B mode; acts as input in B-to-A mode; high-Z when OEA ≠ OEB."
      },
      {
        "number": "10",
        "name": "B1",
        "type": "bidirectional",
        "description": "Port B channel 1 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in A-to-B mode; acts as input in B-to-A mode; high-Z when OEA ≠ OEB."
      },
      {
        "number": "11",
        "name": "B0",
        "type": "bidirectional",
        "description": "Port B channel 0 bidirectional tri-state I/O; drives as output (VOH ≥ 3.84 V, VOL ≤ 0.33 V at IOH = −6 mA / IOL = 6 mA, VCC = 4.5 V) in A-to-B mode; acts as input in B-to-A mode; high-Z when OEA ≠ OEB."
      },
      {
        "number": "12",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection."
      },
      {
        "number": "13",
        "name": "OEA",
        "type": "input",
        "description": "Output-enable A control input; HIGH (with OEB HIGH) enables B-to-A data flow (An = output, Bn = input); LOW (with OEB LOW) enables A-to-B data flow; mixed OEA/OEB states force all I/O to high-Z; VIL = 0.8 V max, VIH = 2 V min (HCT type)."
      },
      {
        "number": "14",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage; HCT type: 4.5 V to 5.5 V recommended operating range; continuous current through VCC must not exceed ±70 mA."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.2",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.2",
        "primary_model": "claude-sonnet-4-6",
        "primary_mode": "text+vision",
        "consensus_model": "claude-opus-4-7",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 24,
        "cost_usd": 0.6154,
        "at": "2026-09-26T20:50:24"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/cd74hct243",
        "pages": 24,
        "sha256": "40fb03b77b5d31c8",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 14,
        "described": 14,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "cd74hct243m.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          8.7,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "3b9a775da256c8afcc28dcddfbc2eb3f266107fe61ce8446d96f2c52b6f44a70",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "cd74hct243m-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          8.7,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "c47807dd26ef196b51d02add441696ac28eac1215bad891c38435619146799c1",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-14",
      "Category": "Logic",
      "Pins": "14"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "cd74hct243m"
  ],
  "discovery_pitch": "CD74HCT243M (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "cd74hct243m.kicad_sym",
    "cd74hct243m.kicad_mod",
    "cd74hct243m.glb",
    "cd74hct243m.step",
    "cd74hct243m.lbr",
    "docs/hero.png",
    "docs/cd74hct243m-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  }
}