LD1117AS33TR

{
  "schema_version": 1,
  "type": "component",
  "slug": "ld1117as33tr",
  "title": "LD1117AS33TR",
  "brief": "STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-4. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "ld1117as33tr"
  ],
  "component": {
    "mpn": "LD1117AS33TR",
    "manufacturer": "STMicroelectronics",
    "package": "SOT-223-4",
    "pin_count": 4,
    "category": "PMIC",
    "subcategory": "Voltage Regulators - Linear, Low Drop Out (LDO) Regulators",
    "datasheet": "https://www.st.com/resource/en/datasheet/ld1117as33tr.pdf",
    "parts": {
      "symbol": "ld1117as33tr.kicad_sym",
      "footprint": "ld1117as33tr.kicad_mod",
      "model_3d": "ld1117as33tr-etched.glb",
      "model_3d_plain": "ld1117as33tr.glb",
      "model_3d_step": "ld1117as33tr-etched.step",
      "model_3d_step_plain": "ld1117as33tr.step",
      "lbr": "ld1117as33tr.lbr"
    },
    "distributor_links": {
      "digikey": "497-1228-2-ND",
      "mouser": "511-LD1117AS33",
      "lcsc": "C115288"
    },
    "pins": [
      {
        "number": "1",
        "name": "ADJ/GND",
        "type": "power_in",
        "description": "Ground reference pin for the fixed 3.3 V version (labeled ADJ/GND because the same die is used for the adjustable variant). Tie directly to system ground for the LD1117AS33TR. Quiescent current is typically 5 mA."
      },
      {
        "number": "2",
        "name": "VOUT",
        "type": "power_out",
        "description": "Regulated 3.3 V output (typ 3.3 V, 3.234-3.366 V at 25 °C, 10 mA). Sources up to 1 A (min 1000 mA, typ 1200 mA short-circuit). Requires a ≥10 µF output capacitor for loop stability. Internally connected to the exposed metal tab."
      },
      {
        "number": "3",
        "name": "VIN",
        "type": "power_in",
        "description": "Unregulated DC input supply. Operating input voltage up to 10 V (absolute max 15 V). Minimum VIN for 3.3 V regulation is ~4.75 V (dropout typ 1.15 V at 1 A). A 100 nF input decoupling capacitor is recommended."
      },
      {
        "number": "4",
        "name": "TAB",
        "type": "power_out",
        "description": "Large SOT-223 heat-sink tab, internally shorted to VOUT. Provides the primary thermal path (RthJC = 15 °C/W); should be soldered to a copper area on the PCB that is also the VOUT net."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.st.com/resource/en/datasheet/ld1117as33tr.pdf",
        "pages": 24,
        "sha256": "c2dd41daa75f2827",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 4,
        "described": 4,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -3.15,
        -2.3
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOT-223@sha256:49f22605ecc1fc70",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "ld1117as33tr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.0,
          6.5,
          1.7
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "77ad6dbacc493cb619c728f26d2ddcf461eb0feb6b977b47d01d51e67016f654",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ld1117as33tr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.0,
          6.5,
          1.7
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "b1e41ba6e575c7b4bd39db8450ab8c18fc0d07fcbdffa03ed533fab33d1b460e",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "STMicroelectronics",
      "Package": "SOT-223-4",
      "Category": "PMIC",
      "Pins": "4"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ld1117as33tr"
  ],
  "discovery_pitch": "LD1117AS33TR (STMicroelectronics) 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",
    "ld1117as33tr.kicad_sym",
    "ld1117as33tr.kicad_mod",
    "ld1117as33tr.glb",
    "ld1117as33tr.step",
    "ld1117as33tr-etched.step",
    "ld1117as33tr.lbr",
    "docs/hero.png",
    "docs/ld1117as33tr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "variants": [
    {
      "mpn": "LD1117AS33TR",
      "kind": "packaging"
    },
    {
      "mpn": "LD1117AS33TRASTR",
      "kind": "packaging"
    },
    {
      "mpn": "LD1117AS33TRAS12TR",
      "kind": "packaging"
    },
    {
      "mpn": "LD1117AS33TRAS18TR",
      "kind": "packaging"
    },
    {
      "mpn": "LD1117AS33TRADT33TR",
      "kind": "packaging"
    },
    {
      "mpn": "LD1117AS33TRADT-TR",
      "kind": "packaging"
    },
    {
      "mpn": "LD1117AS33TRADT12TR",
      "kind": "packaging"
    },
    {
      "mpn": "LD1117AS33TRADT18TR",
      "kind": "packaging"
    },
    {
      "mpn": "LD1117AS33TRAV33",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-24T23:46:40.790Z"
}