LT1121CST-3.3#PBF

{
  "slug": "lt1121cst-3-3-pbf",
  "version": "0.1.0",
  "type": "component",
  "description": "Analog Devices Linear Voltage Regulators (LDO), SOT-223-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management ics",
    "lt1121cst-3.3#pbf",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
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  "files": [
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    "README.md",
    "lt1121cst-3-3-pbf.kicad_sym",
    "lt1121cst-3-3-pbf.kicad_mod",
    "lt1121cst-3-3-pbf.glb",
    "lt1121cst-3-3-pbf.step",
    "lt1121cst-3-3-pbf.lbr",
    "docs/hero.png",
    "docs/lt1121cst-3-3-pbf-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lt1121cst-3-3-pbf-hero.glb",
    "lt1121cst-3-3-pbf-hero.overlay.json",
    "lt1121cst-3-3-pbf-etched.glb"
  ],
  "component": {
    "mpn": "LT1121CST-3.3#PBF",
    "manufacturer": "Analog Devices",
    "package": "SOT-223-3",
    "pin_count": 3,
    "category": "Power Management ICs",
    "subcategory": "Linear Voltage Regulators (LDO)",
    "datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/1121fg.pdf",
    "parts": {
      "symbol": "lt1121cst-3-3-pbf.kicad_sym",
      "footprint": "lt1121cst-3-3-pbf.kicad_mod",
      "model_3d": "lt1121cst-3-3-pbf-hero.glb",
      "model_3d_plain": "lt1121cst-3-3-pbf-etched.glb",
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      "model_3d_step_plain": "lt1121cst-3-3-pbf.step",
      "lbr": "lt1121cst-3-3-pbf.lbr"
    },
    "distributor_links": {
      "lcsc": "C661283",
      "digikey": "505-LT1121CST-3.3#PBF-ND",
      "mouser": "584-LT1121CST-3.3PBF"
    },
    "distributor_check": {
      "checked_at": "2026-10-28T15:57:31Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "505-LT1121CST-3.3#PBF-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "584-LT1121CST-3.3PBF",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VIN",
        "type": "power_in",
        "description": "Power input; the datasheet recommends a 0.1µF to 1µF bypass to ground, and the pin withstands reverse voltage (absolute maximum ±30V for the LT1121) without reverse current flow."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference pin, which is also connected to the package tab."
      },
      {
        "number": "3",
        "name": "OUT",
        "type": "power_out",
        "description": "Regulated 3.3V output supplying up to 150mA to the load; an output capacitor is required (minimum recommended 1µF with ESR of 3Ω or less) to prevent oscillation."
      }
    ],
    "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 SOT-223 pin diagram on page 2 is garbled in the extracted text, so the pin 1/2/3 assignment is i; The tab is labelled GND in the SOT-223 drawing but is not given a pin number in the text, so it is n"
        ],
        "pages_sent": 16,
        "cost_usd": 0.0276,
        "at": "2026-10-28T15:57:03"
      },
      "datasheet": {
        "url": "https://www.analog.com/media/en/technical-documentation/data-sheets/1121fg.pdf",
        "pages": 16,
        "sha256": "326db42fecefd774",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "77ad6dbacc493cb619c728f26d2ddcf461eb0feb6b977b47d01d51e67016f654",
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        "checked": "2026-10-28",
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}