74HC4538PW

{
  "schema_version": 1,
  "type": "component",
  "slug": "74hc4538pw",
  "title": "74HC4538PW",
  "brief": "Nexperia Monostable Multivibrators, TSSOP-16. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "logic",
    "74hc4538pw"
  ],
  "component": {
    "mpn": "74HC4538PW",
    "manufacturer": "Nexperia",
    "package": "TSSOP-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Monostable Multivibrators",
    "datasheet": "https://assets.nexperia.com/documents/data-sheet/74HC4538PW.pdf",
    "parts": {
      "symbol": "74hc4538pw.kicad_sym",
      "footprint": "74hc4538pw.kicad_mod",
      "model_3d": "74hc4538pw-etched.glb",
      "model_3d_plain": "74hc4538pw.glb",
      "model_3d_step": "74hc4538pw-etched.step",
      "model_3d_step_plain": "74hc4538pw.step",
      "lbr": "74hc4538pw.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "1CEXT",
        "type": "passive",
        "description": "External timing capacitor connection for multivibrator 1 (always connected to ground side of CEXT)."
      },
      {
        "number": "2",
        "name": "1REXT/CEXT",
        "type": "passive",
        "description": "External timing resistor/capacitor connection for multivibrator 1. Pulse width T = 0.7 x REXT x CEXT."
      },
      {
        "number": "3",
        "name": "1CD",
        "type": "input",
        "description": "Direct reset input for multivibrator 1 (active LOW). A LOW terminates the output pulse immediately."
      },
      {
        "number": "4",
        "name": "1B",
        "type": "input",
        "description": "Trigger input B for multivibrator 1 (LOW-to-HIGH edge triggered). Schmitt-trigger input."
      },
      {
        "number": "5",
        "name": "1A",
        "type": "input",
        "description": "Trigger input A for multivibrator 1 (HIGH-to-LOW edge triggered, active LOW). Schmitt-trigger input."
      },
      {
        "number": "6",
        "name": "1Q",
        "type": "output",
        "description": "True output of multivibrator 1. Emits a HIGH pulse of width 0.7 x REXT x CEXT on trigger."
      },
      {
        "number": "7",
        "name": "1Q_bar",
        "type": "output",
        "description": "Complementary (inverted, active LOW) output of multivibrator 1."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V)."
      },
      {
        "number": "9",
        "name": "2Q_bar",
        "type": "output",
        "description": "Complementary (inverted, active LOW) output of multivibrator 2."
      },
      {
        "number": "10",
        "name": "2Q",
        "type": "output",
        "description": "True output of multivibrator 2. Emits a HIGH pulse of width 0.7 x REXT x CEXT on trigger."
      },
      {
        "number": "11",
        "name": "2A",
        "type": "input",
        "description": "Trigger input A for multivibrator 2 (HIGH-to-LOW edge triggered, active LOW). Schmitt-trigger input."
      },
      {
        "number": "12",
        "name": "2B",
        "type": "input",
        "description": "Trigger input B for multivibrator 2 (LOW-to-HIGH edge triggered). Schmitt-trigger input."
      },
      {
        "number": "13",
        "name": "2CD",
        "type": "input",
        "description": "Direct reset input for multivibrator 2 (active LOW). A LOW terminates the output pulse immediately."
      },
      {
        "number": "14",
        "name": "2REXT/CEXT",
        "type": "passive",
        "description": "External timing resistor/capacitor connection for multivibrator 2. Pulse width T = 0.7 x REXT x CEXT."
      },
      {
        "number": "15",
        "name": "2CEXT",
        "type": "passive",
        "description": "External timing capacitor connection for multivibrator 2 (always connected to ground side of CEXT)."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage, 2.0 V to 6.0 V (absolute max 7.0 V)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://assets.nexperia.com/documents/data-sheet/74HC4538PW.pdf",
        "pages": 17,
        "sha256": "c779fe6317e1e04e",
        "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": "74HC4538",
      "logic_family": "74HC",
      "function_code": "4538",
      "function_class": "Multivibrator",
      "function_name": "Dual Precision Monostable Multivibrator",
      "manufacturer": null,
      "is_specialty": false
    },
    "models_3d": [
      {
        "file": "74hc4538pw.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": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "74hc4538pw-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": "a7f21be70b0d2ecc52cdcbd84770fffc143c80238af40a60da39307e01823984",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Nexperia",
      "Package": "TSSOP-16",
      "Category": "Logic",
      "Pins": "16"
    }
  },
  "variants": [
    {
      "mpn": "74HC4538PW",
      "kind": "packaging"
    },
    {
      "mpn": "74HC4538PWD",
      "kind": "packaging"
    }
  ],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "74hc4538pw"
  ],
  "discovery_pitch": "74HC4538PW (Nexperia) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "74hc4538pw.kicad_sym",
    "74hc4538pw.kicad_mod",
    "74hc4538pw.glb",
    "74hc4538pw.step",
    "74hc4538pw.lbr",
    "docs/hero.png",
    "docs/74hc4538pw-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T15:01:45.124Z"
}