MC74HC238ADTR2G

{
  "slug": "mc74hc238adtr2g",
  "version": "0.1.0",
  "type": "component",
  "description": "onsemi Signal Switches, Multiplexers, Decoders, TSSOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "mc74hc238adtr2g",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "mc74hc238adtr2g.kicad_sym",
    "mc74hc238adtr2g.kicad_mod",
    "mc74hc238adtr2g.glb",
    "mc74hc238adtr2g.step",
    "mc74hc238adtr2g.lbr",
    "docs/hero.png",
    "docs/mc74hc238adtr2g-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "mc74hc238adtr2g-hero.glb",
    "mc74hc238adtr2g-hero.overlay.json",
    "mc74hc238adtr2g-etched.glb"
  ],
  "component": {
    "mpn": "MC74HC238ADTR2G",
    "manufacturer": "onsemi",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Signal Switches, Multiplexers, Decoders",
    "datasheet": "https://www.onsemi.com/pdf/datasheet/mc74hc238adtr2-d.pdf",
    "parts": {
      "symbol": "mc74hc238adtr2g.kicad_sym",
      "footprint": "mc74hc238adtr2g.kicad_mod",
      "model_3d": "mc74hc238adtr2g-hero.glb",
      "model_3d_plain": "mc74hc238adtr2g-etched.glb",
      "model_3d_step": "mc74hc238adtr2g-etched.step",
      "model_3d_step_plain": "mc74hc238adtr2g.step",
      "lbr": "mc74hc238adtr2g.lbr"
    },
    "distributor_links": {
      "lcsc": "C904037",
      "digikey": "MC74HC238ADTR2GOSTR-ND",
      "mouser": "863-MC74HC238ADTR2G"
    },
    "distributor_check": {
      "checked_at": "2026-10-27T22:08:00Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "MC74HC238ADTR2GOSTR-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "863-MC74HC238ADTR2G",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "A0",
        "type": "input",
        "description": "Address input that, when the chip is selected, determines which of the eight outputs is active."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "Address input that, when the chip is selected, determines which of the eight outputs is active."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "input",
        "description": "Address input that, when the chip is selected, determines which of the eight outputs is active."
      },
      {
        "number": "4",
        "name": "CS2",
        "type": "input",
        "description": "Active-low chip select input; the chip is selected only when CS2 is low together with CS1 high and CS3 low."
      },
      {
        "number": "5",
        "name": "CS3",
        "type": "input",
        "description": "Active-low chip select input; the chip is selected only when CS3 is low together with CS1 high and CS2 low."
      },
      {
        "number": "6",
        "name": "CS1",
        "type": "input",
        "description": "Active-high chip select input; the chip is selected only when CS1 is high together with CS2 and CS3 low, otherwise all outputs are held low."
      },
      {
        "number": "7",
        "name": "Y7",
        "type": "output",
        "description": "Active-high decoded output that goes high when addressed and the chip is selected, and remains low otherwise."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for all voltages referenced to GND in the datasheet."
      },
      {
        "number": "9",
        "name": "Y6",
        "type": "output",
        "description": "Active-high decoded output that goes high when addressed and the chip is selected, and remains low otherwise."
      },
      {
        "number": "10",
        "name": "Y5",
        "type": "output",
        "description": "Active-high decoded output that goes high when addressed and the chip is selected, and remains low otherwise."
      },
      {
        "number": "11",
        "name": "Y4",
        "type": "output",
        "description": "Active-high decoded output that goes high when addressed and the chip is selected, and remains low otherwise."
      },
      {
        "number": "12",
        "name": "Y3",
        "type": "output",
        "description": "Active-high decoded output that goes high when addressed and the chip is selected, and remains low otherwise."
      },
      {
        "number": "13",
        "name": "Y2",
        "type": "output",
        "description": "Active-high decoded output that goes high when addressed and the chip is selected, and remains low otherwise."
      },
      {
        "number": "14",
        "name": "Y1",
        "type": "output",
        "description": "Active-high decoded output that goes high when addressed and the chip is selected, and remains low otherwise."
      },
      {
        "number": "15",
        "name": "Y0",
        "type": "output",
        "description": "Active-high decoded output that goes high when addressed and the chip is selected, and remains low otherwise."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply pin; DC supply voltage is 2.0 V to 6.0 V referenced to GND."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet gives no TSSOP-specific pin table. Pin numbers come from the pin descriptions (page 5)"
        ],
        "pages_sent": 9,
        "cost_usd": 0.0604,
        "at": "2026-10-27T22:07:44"
      },
      "datasheet": {
        "url": "https://www.onsemi.com/pdf/datasheet/mc74hc238adtr2-d.pdf",
        "pages": 9,
        "sha256": "eb72547dc9e9c028",
        "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"
    },
    "models_3d": [
      {
        "file": "mc74hc238adtr2g.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          5.0,
          1.1
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "6ad5e98224d02a427d9a6b929a28dbc158b9925fba5adec12db05079f1016948",
        "checked": "2026-10-27",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "mc74hc238adtr2g-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          5.0,
          1.1
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "591b9e6ef15fa528bcf3d9e3a798e175f5e429bb740ceef608d1ce7aed99a8da",
        "checked": "2026-10-27",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}