MC74ACT125DR2G

{
  "schema_version": 1,
  "type": "component",
  "slug": "mc74act125dr2g",
  "title": "MC74ACT125DR2G",
  "brief": "onsemi Buffer/Driver/Transceiver, SOIC-14. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "logic",
    "mc74act125dr2g"
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  "component": {
    "mpn": "MC74ACT125DR2G",
    "manufacturer": "onsemi",
    "package": "SOIC-14",
    "pin_count": 14,
    "category": "Logic",
    "subcategory": "Buffer/Driver/Transceiver",
    "datasheet": "https://www.onsemi.com/pdf/datasheet/mc74act125-d.pdf",
    "parts": {
      "symbol": "mc74act125dr2g.kicad_sym",
      "footprint": "mc74act125dr2g.kicad_mod",
      "model_3d": "mc74act125dr2g-etched.glb",
      "model_3d_plain": "mc74act125dr2g.glb",
      "model_3d_step": "mc74act125dr2g-etched.step",
      "model_3d_step_plain": "mc74act125dr2g.step",
      "lbr": "mc74act125dr2g.lbr"
    },
    "distributor_links": {
      "digikey": "MC74ACT125DR2GOSTR-ND",
      "mouser": "863-MC74ACT125DR2G",
      "lcsc": "C113254"
    },
    "pins": [
      {
        "number": "1",
        "name": "~A0",
        "type": "input",
        "description": "Active-low output enable for buffer 0. When low the buffer drives O0 with B0; when high O0 is placed in the high-impedance (3-state) state. TTL-compatible input threshold (VIH >= 2.0 V, VIL <= 0.8 V) with input leakage +/-1 uA max."
      },
      {
        "number": "2",
        "name": "B0",
        "type": "input",
        "description": "Data input for buffer 0. Drives O0 when the corresponding output enable ~A0 is low; ignored (X) when ~A0 is high (output high-Z). TTL-compatible input threshold on the 'ACT variant."
      },
      {
        "number": "3",
        "name": "O0",
        "type": "tri_state",
        "description": "3-state buffered output for channel 0. Follows B0 when ~A0 is low; high-Z when ~A0 is high. Drive capability +/-24 mA at VCC = 4.5 V (IOH/IOL guaranteed limits)."
      },
      {
        "number": "4",
        "name": "~A1",
        "type": "input",
        "description": "Active-low output enable for buffer 1. Low = enable (O1 = B1); high = high-Z output."
      },
      {
        "number": "5",
        "name": "B1",
        "type": "input",
        "description": "Data input for buffer 1. Passed to O1 when ~A1 is low."
      },
      {
        "number": "6",
        "name": "O1",
        "type": "tri_state",
        "description": "3-state buffered output for channel 1. Drives +/-24 mA; high-Z when ~A1 is high."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V) for the device. All input/output voltages are referenced to this pin."
      },
      {
        "number": "8",
        "name": "O3",
        "type": "tri_state",
        "description": "3-state buffered output for channel 3. Follows B3 when ~A3 is low; high-Z when ~A3 is high."
      },
      {
        "number": "9",
        "name": "B3",
        "type": "input",
        "description": "Data input for buffer 3. Passed to O3 when ~A3 is low."
      },
      {
        "number": "10",
        "name": "~A3",
        "type": "input",
        "description": "Active-low output enable for buffer 3. Low = enable (O3 = B3); high = high-Z output."
      },
      {
        "number": "11",
        "name": "O2",
        "type": "tri_state",
        "description": "3-state buffered output for channel 2. Follows B2 when ~A2 is low; high-Z when ~A2 is high."
      },
      {
        "number": "12",
        "name": "B2",
        "type": "input",
        "description": "Data input for buffer 2. Passed to O2 when ~A2 is low."
      },
      {
        "number": "13",
        "name": "~A2",
        "type": "input",
        "description": "Active-low output enable for buffer 2. Low = enable (O2 = B2); high = high-Z output."
      },
      {
        "number": "14",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply. Recommended 4.5-5.5 V for the 'ACT variant (absolute max 7.0 V). Bypass with a 0.1 uF ceramic near the pin."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.onsemi.com/pdf/datasheet/mc74act125-d.pdf",
        "pages": 8,
        "sha256": "a8b1cd5809fcaf46",
        "source_tier": "mfr"
      },
      "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"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -3.81
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-14_3.9x8.7mm_P1.27mm@sha256:a885b619b22880c9",
      "mark": "drawn"
    },
    "logic": {
      "family_id": "74ACT125",
      "logic_family": "74ACT",
      "function_code": "125",
      "function_class": "Buffer",
      "function_name": "Quad Bus Buffer with 3-State Outputs",
      "manufacturer": "Onsemi (Motorola legacy)",
      "is_specialty": false
    },
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          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": "mc74act125dr2g-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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        "sha256": "7d62c316ca37dc34d1508e90e961e0fa833e91e0dcf7f451871949dcc0322950",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "onsemi",
      "Package": "SOIC-14",
      "Category": "Logic",
      "Pins": "14"
    }
  },
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
    "info"
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  "discovery_triggers": [
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  "discovery_pitch": "MC74ACT125DR2G (onsemi) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "README.md",
    "mc74act125dr2g.kicad_sym",
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    "mc74act125dr2g.step",
    "mc74act125dr2g.lbr",
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    "viewers/footprint.html",
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  "visibility": {
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  "variants": [
    {
      "mpn": "MC74ACT125DR2G",
      "kind": "packaging"
    },
    {
      "mpn": "MC74ACT125DR2GDG",
      "kind": "packaging"
    },
    {
      "mpn": "MC74ACT125DR2GDTR2G",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-28T18:50:44.409Z"
}