main
Ray Set visibility: public 520939f 2d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "lm7909l-ta3-t",
  "title": "LM7909L-TA3-T",
  "brief": "UTC(Unisonic Tech) Linear Voltage Regulators (LDO), TO-220. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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  "component": {
    "mpn": "LM7909L-TA3-T",
    "manufacturer": "UTC(Unisonic Tech)",
    "package": "TO-220",
    "pin_count": 3,
    "category": "Power Management ICs",
    "subcategory": "Linear Voltage Regulators (LDO)",
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      "lbr": "lm7909l-ta3-t.lbr"
    },
    "distributor_links": {
      "lcsc": "C427635"
    },
    "distributor_check": {
      "checked_at": "2026-11-05T03:46:19Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground pin of the -9V regulator; the datasheet gives no separate electrical limit for this pin."
      },
      {
        "number": "2",
        "name": "INPUT",
        "type": "power_in",
        "description": "Negative unregulated input supply, with an absolute maximum input voltage of -35V; the LM7909 output is specified with VIN from -11.5V to -23V (test condition VIN=-15V)."
      },
      {
        "number": "3",
        "name": "OUTPUT",
        "type": "power_out",
        "description": "Regulated -9V output (typical -9.0V at TJ=25C) that is current-limited to 1A, with a typical peak current of 2.2A."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
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        "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 pin mapping comes from the ordering table on page 1, where the header reads '1 2 3' and the TO-2; The datasheet names pin 1 as GND only in the ordering note ('G: GND'). It gives no drawing or furthe"
        ],
        "pages_sent": 8,
        "cost_usd": 0.0364,
        "at": "2026-11-05T03:46:12"
      },
      "datasheet": {
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        "pages": 8,
        "sha256": "48805386c54c2ca0",
        "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",
      "footprint": "viewers/footprint.html"
    },
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
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          4.455,
          28.525
        ],
        "zmin_mm": -9.75,
        "centre_offset_mm": 0.932,
        "footprint_binding": "identity",
        "sha256": "7cb065d935df5771f0ba6e48ddd180863a121af76483dad7f18e667a7b68204a",
        "checked": "2026-11-05",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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      {
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        "sha256": "22a6e8d5cbfa53812866e5c767c92ceb3de53bb631256a423ba9f52152769445",
        "checked": "2026-11-05",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "UTC(Unisonic Tech)",
      "Package": "TO-220",
      "Category": "Power Management ICs",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "48805386c54c2ca012e4e031d71037286199dedee7d379bf508e0917ea2bc160",
      "rows": [
        {
          "name": "Output Voltage",
          "symbol": "VOUT",
          "kind": "electrical",
          "unit": "V",
          "min": -8.64,
          "typ": -9,
          "max": -9.36,
          "conditions": "TJ=25C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output Voltage",
          "symbol": "VOUT",
          "kind": "electrical",
          "unit": "V",
          "min": -8.55,
          "typ": null,
          "max": -9.45,
          "conditions": "VIN=-11.5V~-23V, IOUT=5mA~1A, PD≦15W",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Line Regulation",
          "symbol": "VOUT",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 10,
          "max": 180,
          "conditions": "VIN=-11.5V~-26V TJ=25C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Line Regulation",
          "symbol": "VOUT",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 5,
          "max": 90,
          "conditions": "VIN=-12V~-18V TJ=25C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Load Regulation",
          "symbol": "VOUT",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 12,
          "max": 180,
          "conditions": "IOUT=5mA~1A TJ=25C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Load Regulation",
          "symbol": "VOUT",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 4,
          "max": 90,
          "conditions": "IOUT=250mA~750mA TJ=25C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Current",
          "symbol": "IQ",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 3,
          "max": 6,
          "conditions": "TJ=25C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Current Change",
          "symbol": "IQ",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.05,
          "max": 0.5,
          "conditions": "IOUT=5mA~1A",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Quiescent Current Change",
          "symbol": "IQ",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.1,
          "max": 1,
          "conditions": "VIN=-11.5V~-26V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Ripple Rejection",
          "symbol": "RR",
          "kind": "electrical",
          "unit": "dB",
          "min": 54,
          "typ": 60,
          "max": null,
          "conditions": "VIN=-12.5V~-22.5V, f=120Hz",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Input Voltage",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": -35,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Output Current",
          "symbol": "IOUT",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Operating Temperature",
          "symbol": "TOPR",
          "kind": "absolute_maximum",
          "unit": "C",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "Storage Temperature",
          "symbol": "TSTG",
          "kind": "absolute_maximum",
          "unit": "C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction to Ambient Thermal Resistance",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "C /W",
          "min": null,
          "typ": 65,
          "max": null,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction to Case Thermal Resistance",
          "symbol": "θJC",
          "kind": "thermal",
          "unit": "C /W",
          "min": null,
          "typ": 5,
          "max": null,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Dropout Voltage",
          "symbol": "VD",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 2,
          "max": null,
          "conditions": "IOUT=1A TJ=25C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output Noise Voltage",
          "symbol": "eN",
          "kind": "electrical",
          "unit": "μV",
          "min": null,
          "typ": 175,
          "max": null,
          "conditions": "f=10Hz~100kHz TA=25C",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output Voltage Drift",
          "symbol": "VOUT/T",
          "kind": "electrical",
          "unit": "mV/C",
          "min": null,
          "typ": -0.6,
          "max": null,
          "conditions": "IOUT=5mA",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Peak Current",
          "symbol": "IPEAK",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": 2.2,
          "max": null,
          "conditions": "TJ=25C",
          "source_page": 5,
          "source": "datasheet"
        }
      ]
    }
  },
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  "discovery_triggers": [
    "lm7909l-ta3-t"
  ],
  "discovery_pitch": "LM7909L-TA3-T (UTC(Unisonic Tech)) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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}