LD1117AS18TR

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  "title": "LD1117AS18TR",
  "brief": "STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-3. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
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    "manufacturer": "STMicroelectronics",
    "package": "SOT-223-3",
    "pin_count": 3,
    "category": "PMIC",
    "subcategory": "Voltage Regulators - Linear, Low Drop Out (LDO) Regulators",
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    "distributor_links": {
      "digikey": "497-1226-2-ND",
      "mouser": "511-LD1117AS18",
      "lcsc": "C2845037"
    },
    "pins": [
      {
        "number": "1",
        "name": "ADJ/GND",
        "type": "power_in",
        "description": "Ground reference pin for the fixed-output versions (LD1117AS18 uses this pin as GND). On the adjustable variant this same pin is the ADJ feedback input (VREF = 1.25 V to the external divider). Connect to system ground for the LD1117AS18TR (1.8 V fixed)."
      },
      {
        "number": "2",
        "name": "VOUT",
        "type": "power_out",
        "description": "Regulated 1.8 V output. Sources up to 1 A (1.2 A typical current limit). Requires a minimum 10 µF output capacitor to GND for loop stability. The SOT-223 tab is internally connected to this pin. Also the package tab: sOT-223 thermal tab, internally shorted to the VOUT pin (pin 2). Provides the primary heat-sinking path (RthJC = 15 °C/W, RthJA = 110 °C/W). Solder to a copper pour tied to VOUT to improve thermal performance."
      },
      {
        "number": "3",
        "name": "VIN",
        "type": "power_in",
        "description": "Unregulated DC input supply. Operating input voltage up to 10 V (absolute max 15 V). Dropout ≤1.15 V typ at 1 A, so VIN must be ≥ VOUT + VDROPOUT. A 100 nF input capacitor is recommended close to the pin."
      }
    ],
    "provenance": {
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        "pages": 24,
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 4,
        "described": 4,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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    },
    "pin1": {
      "pad": "1",
      "at": [
        -3.15,
        -2.3
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOT-223-3_TabPin2@sha256:8ae5f03e2c16377a",
      "mark": "drawn"
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        "extents_mm": [
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          6.5,
          1.7
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "77ad6dbacc493cb619c728f26d2ddcf461eb0feb6b977b47d01d51e67016f654",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "STMicroelectronics",
      "Package": "SOT-223-3",
      "Category": "PMIC",
      "Pins": "4"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "5cf3aab5b1478366",
      "rows": [
        {
          "name": "Output voltage",
          "symbol": "VO",
          "kind": "electrical",
          "unit": "V",
          "min": 1.764,
          "typ": 1.8,
          "max": 1.836,
          "conditions": "VI = 3.8 V, IO = 10 mA, TJ = 25 °C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Output voltage",
          "symbol": "VO",
          "kind": "electrical",
          "unit": "V",
          "min": 1.728,
          "typ": null,
          "max": 1.872,
          "conditions": "IO = 0 to 1 A, VI = 3.3 to 8 V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Line regulation",
          "symbol": "ΔVO",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 1,
          "max": 6,
          "conditions": "VI = 3.3 to 8 V, IO = 0 mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Load regulation",
          "symbol": "ΔVO",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 1,
          "max": 10,
          "conditions": "VI = 3.3 V, IO = 0 to 1 A",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Temperature stability",
          "symbol": "ΔVO",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": null,
          "max": 0.5,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Long term stability",
          "symbol": "ΔVO",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": null,
          "max": 0.3,
          "conditions": "1000 hrs, TJ = 125 °C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Operating input voltage",
          "symbol": "VI",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "IO = 100 mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Quiescent current",
          "symbol": "Id",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 5,
          "max": 10,
          "conditions": "VI ≤ 8 V, IO = 0 mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Output current",
          "symbol": "IO",
          "kind": "electrical",
          "unit": "mA",
          "min": 1000,
          "typ": null,
          "max": null,
          "conditions": "VI - VO = 5 V, TJ = 25 °C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Output noise voltage",
          "symbol": "eN",
          "kind": "electrical",
          "unit": "µV",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "B = 10 Hz to 10 kHz, TJ = 25 °C",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Supply voltage rejection",
          "symbol": "SVR",
          "kind": "electrical",
          "unit": "dB",
          "min": 60,
          "typ": 80,
          "max": null,
          "conditions": "IO = 40 mA, f = 120 Hz, VI - VO = 3 V, Vripple = 1 VPP",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Dropout voltage",
          "symbol": "VD",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1,
          "max": 1.1,
          "conditions": "IO = 100 mA",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Dropout voltage",
          "symbol": "VD",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1.05,
          "max": 1.15,
          "conditions": "IO = 500 mA",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Dropout voltage",
          "symbol": "VD",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1.15,
          "max": 1.3,
          "conditions": "IO = 1 A",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Thermal regulation",
          "symbol": "ΔVO(pwr)",
          "kind": "thermal",
          "unit": "%/W",
          "min": null,
          "typ": 0.08,
          "max": 0.2,
          "conditions": "Ta = 25 °C, 30 ms pulse",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "DC input voltage",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 15,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Power dissipation",
          "symbol": "PD",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 12,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature range",
          "symbol": "TSTG",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Operating junction temperature range",
          "symbol": "TOP",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": 0,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance junction-case, SOT-223",
          "symbol": "RthJC",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 15,
          "max": null,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Thermal resistance junction-ambient, SOT-223",
          "symbol": "RthJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 110,
          "max": null,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        }
      ]
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    "name": "Ray"
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  "variants": [
    {
      "mpn": "LD1117AS18TR",
      "kind": "packaging"
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    {
      "mpn": "LD1117ADT18TR",
      "kind": "unknown"
    },
    {
      "mpn": "LD1117AV33",
      "kind": "unknown"
    }
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  "updated_at": "2026-09-24T23:46:32.795Z",
  "description": "STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-3. Datasheet-verified pinout, KiCad symbol/footprint/3D.",
  "org": "adom"
}