78L12

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  "schema_version": 1,
  "type": "component",
  "slug": "78l12",
  "title": "78L12",
  "brief": "UMW Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89-3. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "pmic",
    "78l12"
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  "component": {
    "mpn": "78L12",
    "manufacturer": "UMW",
    "package": "SOT-89-3",
    "pin_count": 3,
    "category": "PMIC",
    "subcategory": "Voltage Regulators - Linear, Low Drop Out (LDO) Regulators",
    "datasheet": "docs/78l12-datasheet.pdf",
    "parts": {
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      "footprint": "78l12.kicad_mod",
      "model_3d": "78l12-etched.glb",
      "model_3d_plain": "78l12.glb",
      "model_3d_step": "78l12-etched.step",
      "model_3d_step_plain": "78l12.step",
      "lbr": "78l12.lbr"
    },
    "distributor_links": {
      "lcsc": "C347272"
    },
    "pins": [
      {
        "number": "1",
        "name": "Output",
        "type": "power_out",
        "description": "Regulated +12V output. Delivers up to 100 mA (typ) with ~1.7 V dropout. Requires a ceramic bypass capacitor (CO=0.1 µF typ) to ground for stability."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground reference for input and output. Also carries the quiescent current (~2 mA typ, 5.5 mA max)."
      },
      {
        "number": "3",
        "name": "Input",
        "type": "power_in",
        "description": "Unregulated DC input. Absolute maximum 35 V (Vo≤18V variants). Recommended input capacitor C1=0.33 µF to ground for line-transient rejection. For the 78L12 the recommended operating input range is 14.5 V to 27 V."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
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        "pages": 22,
        "sha256": "3eeae843c9f51425",
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      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
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        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -1.95,
        -1.5
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOT-89-3@sha256:0b8db9f4a8f2547a",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "78l12.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.0,
          4.5,
          1.52
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.05,
        "footprint_binding": "identity",
        "sha256": "844c0bb504d0c383535d9845c6376fe7a4053241a2ede8d8ef694df3fcfc37c8",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.05,
        "footprint_binding": "identity",
        "sha256": "c13c18ae8782fd929f392ef826bced34b48c73a541c95421a11b81e8d4a69419",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "UMW",
      "Package": "SOT-89-3",
      "Category": "PMIC",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "3eeae843c9f51425",
      "rows": [
        {
          "name": "Output voltage (TJ=25°C)",
          "symbol": "VO",
          "kind": "electrical",
          "unit": "V",
          "min": 11.52,
          "typ": 12,
          "max": 12.48,
          "conditions": "TJ=25°C",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Output voltage",
          "symbol": "VO",
          "kind": "electrical",
          "unit": "V",
          "min": 11.4,
          "typ": null,
          "max": 12.6,
          "conditions": "14.5V≤VI≤27V,IO=1mA~40mA",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Quiescent current",
          "symbol": "Iq",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Quiescent current change (line)",
          "symbol": "ΔIq",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 15,
          "conditions": "16V≤VI≤27V",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Quiescent current change (load)",
          "symbol": "ΔIq",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 0.1,
          "conditions": "1mA ≤IO≤40mA",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Input voltage (for VO=3.3 to 18V)",
          "symbol": "VI",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 35,
          "conditions": "for VO=3.3 to 18V",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature range",
          "symbol": "TOPR",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -20,
          "typ": null,
          "max": 120,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature range",
          "symbol": "TSTG",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation (SOT-89)",
          "symbol": "Pd",
          "kind": "absolute_maximum",
          "unit": "mW",
          "min": null,
          "typ": null,
          "max": 400,
          "conditions": "SOT-89 package",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
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  "discovery_triggers": [
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  "discovery_pitch": "78L12 (UMW) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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    "78l12.kicad_sym",
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    "78l12-etched.step",
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    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "updated_at": "2026-09-24T15:22:08.327Z"
}