main
Ray Set visibility: public 23418f9 16d ago
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{
  "schema_version": 1,
  "type": "component",
  "slug": "ld2981cu33tr",
  "title": "LD2981CU33TR",
  "brief": "STMicroelectronics Linear Voltage Regulators (LDO), SOT-89-3. 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",
    "power management ics",
    "ld2981cu33tr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "LD2981CU33TR",
    "manufacturer": "STMicroelectronics",
    "package": "SOT-89-3",
    "pin_count": 3,
    "category": "Power Management ICs",
    "subcategory": "Linear Voltage Regulators (LDO)",
    "datasheet": "https://www.st.com/resource/en/datasheet/ld2981cu33tr.pdf",
    "parts": {
      "symbol": "ld2981cu33tr.kicad_sym",
      "footprint": "ld2981cu33tr.kicad_mod",
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      "model_3d_plain": "ld2981cu33tr-etched.glb",
      "model_3d_step": "ld2981cu33tr-etched.step",
      "model_3d_step_plain": "ld2981cu33tr.step",
      "lbr": "ld2981cu33tr.lbr"
    },
    "distributor_links": {
      "lcsc": "C222133",
      "digikey": "497-3483-2-ND",
      "mouser": "511-LD2981CU33"
    },
    "distributor_check": {
      "checked_at": "2026-10-23T09:16:57Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "497-3483-2-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "511-LD2981CU33",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VOUT",
        "type": "power_out",
        "description": "Regulated output port (3.3 V fixed for LD2981CU33TR), guaranteed up to 100 mA, with 2.2 µF suggested minimum low-ESR ceramic output capacitor for 2.85 to 3.3 V versions."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin."
      },
      {
        "number": "3",
        "name": "VIN",
        "type": "power_in",
        "description": "Input port with operating input voltage 2.5 to 16 V (absolute maximum -0.3 to 16 V) and 1 µF input capacitor required."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin table (Table 1) lists INHIBIT (pin 3) and NC (pin 4) only in the SOT23-5L column; the SOT-89 col; Datasheet text does not state whether the SOT-89 metal tab is connected to a pin (e.g., GND); no tab; Order code table lists LD2981CM33TR in the 5.0 V C-version SOT23-5L slot, apparently a typo; it does"
        ],
        "pages_sent": 27,
        "cost_usd": 0.1013,
        "at": "2026-10-23T09:16:43"
      },
      "datasheet": {
        "url": "https://www.st.com/resource/en/datasheet/ld2981cu33tr.pdf",
        "pages": 27,
        "sha256": "872f7e5b1c76b812",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
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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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        "zmin_mm": 0,
        "centre_offset_mm": 0.05,
        "footprint_binding": "identity",
        "sha256": "844c0bb504d0c383535d9845c6376fe7a4053241a2ede8d8ef694df3fcfc37c8",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ld2981cu33tr-etched.step",
        "role": "eda",
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        "origin": "footprint origin = pad-pattern centre",
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        "sha256": "d3175425c46fed57d7289cbcb3c44f2dee81d2a4794053b08268951d6e53bb9e",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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    "specs": {
      "Manufacturer": "STMicroelectronics",
      "Package": "SOT-89-3",
      "Category": "Power Management ICs",
      "Pins": "3"
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          "min": 2.5,
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          "max": 16,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "Line regulation",
          "symbol": "ΔVO",
          "kind": "electrical",
          "unit": "%/V",
          "min": null,
          "typ": 0.003,
          "max": 0.014,
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        {
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        {
          "name": "Quiescent current ON mode",
          "symbol": "IQ",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
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          "conditions": "IO = 25 mA",
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        {
          "name": "Quiescent current ON mode",
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          "name": "Quiescent current ON mode",
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          "kind": "electrical",
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          "min": null,
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        {
          "name": "Quiescent current ON mode",
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          "min": null,
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          "conditions": "IO = 100 mA, TJ = -40 to 125 °C",
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        {
          "name": "Quiescent current OFF mode",
          "symbol": "IQ",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.8,
          "max": null,
          "conditions": "VINH < 0.3 V",
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        {
          "name": "Dropout voltage",
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          "conditions": "IO = 0, TJ = -40 to 125 °C",
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          "name": "Dropout voltage",
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          "min": null,
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          "conditions": "IO = 1 mA",
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        {
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        {
          "name": "Dropout voltage",
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          "conditions": "IO = 25 mA, TJ = -40 to 125 °C",
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          "conditions": "IO = 100 mA",
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          "max": 375,
          "conditions": "IO = 100 mA, TJ = -40 to 125 °C",
          "source_page": 11,
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        },
        {
          "name": "Inhibit input logic low",
          "symbol": "VINH",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.18,
          "conditions": "LOW = Output OFF, TJ = -40 to 125 °C",
          "source_page": 11,
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        },
        {
          "name": "Inhibit input logic high",
          "symbol": "VINL",
          "kind": "electrical",
          "unit": "V",
          "min": 1.6,
          "typ": null,
          "max": null,
          "conditions": "HIGH = Output ON, TJ = -40 to 125 °C",
          "source_page": 11,
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        },
        {
          "name": "Inhibit input current",
          "symbol": "IINH",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0,
          "max": -1,
          "conditions": "VINH = 0 V, TJ = -40 to 125 °C",
          "source_page": 11,
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        },
        {
          "name": "Inhibit input current",
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          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 5,
          "max": 15,
          "conditions": "VINH = 5 V, TJ = -40 to 125 °C",
          "source_page": 11,
          "source": "datasheet"
        },
        {
          "name": "Short circuit current",
          "symbol": "ISC",
          "kind": "electrical",
          "unit": "mA",
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          "typ": 150,
          "max": null,
          "conditions": "RL = 0",
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        {
          "name": "Supply voltage rejection",
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          "kind": "electrical",
          "unit": "dB",
          "min": null,
          "typ": 63,
          "max": null,
          "conditions": "CO = 10 µF, f = 1 KHz",
          "source_page": 11,
          "source": "datasheet"
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        {
          "name": "Output noise voltage",
          "symbol": "eN",
          "kind": "electrical",
          "unit": "µVRMS",
          "min": null,
          "typ": 160,
          "max": null,
          "conditions": "BW = 300 Hz to 50 KHz, CO = 10 µF",
          "source_page": 11,
          "source": "datasheet"
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        {
          "name": "Thermal shutdown",
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          "kind": "thermal",
          "unit": "°C",
          "min": null,
          "typ": 170,
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          "source_page": 11,
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        {
          "name": "DC input voltage",
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          "min": -0.3,
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        {
          "name": "INHIBIT input voltage",
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          "min": -0.3,
          "typ": null,
          "max": 16,
          "conditions": "",
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          "name": "Storage temperature range",
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        {
          "name": "Operating junction temperature range",
          "symbol": "TOP",
          "kind": "recommended_operating",
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          "min": -40,
          "typ": null,
          "max": 125,
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        {
          "name": "Thermal resistance junction-case",
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          "name": "Thermal resistance junction-ambient",
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          "unit": "°C/W",
          "min": null,
          "typ": 110,
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          "source": "datasheet"
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  "author": {
    "name": "Ray",
    "email": "[email protected]"
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