main
Ray Set visibility: public 20b4a20 16h ago
{
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  "type": "component",
  "slug": "lm317k-tn3-r",
  "title": "LM317K-TN3-R",
  "brief": "UTC(Unisonic Tech) Linear Voltage Regulators (LDO), TO-252-2(DPAK). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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  "component": {
    "mpn": "LM317K-TN3-R",
    "manufacturer": "UTC(Unisonic Tech)",
    "package": "TO-252-2(DPAK)",
    "pin_count": 3,
    "category": "Power Management ICs",
    "subcategory": "Linear Voltage Regulators (LDO)",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/1305ced5b88b5021d2983f82108bc51d.pdf",
    "parts": {
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      "lbr": "lm317k-tn3-r.lbr"
    },
    "distributor_links": {
      "lcsc": "C207748"
    },
    "distributor_check": {
      "checked_at": "2026-10-22T21:15:53Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "ADJ",
        "type": "input",
        "description": "Adjust pin; reference voltage VREF is 1.20V min, 1.25V typ, 1.30V max, with adjustable pin current typically 50μA (100μA max)."
      },
      {
        "number": "2",
        "name": "VOUT",
        "type": "power_out",
        "description": "Regulated output (1.3V to 37V adjustable) supplying output current in excess of 1A with internal short circuit protection."
      },
      {
        "number": "3",
        "name": "VIN",
        "type": "power_in",
        "description": "Unregulated input; input-output voltage difference must not exceed 40V."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
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        "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: Datasheet pin table lists TO-252 as 1=ADJ, 2=O (VOUT), 3=I (VIN) only; the tab is not described (typ"
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        "pages_sent": 5,
        "cost_usd": 0.0396,
        "at": "2026-10-22T21:15:40"
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        "pages": 5,
        "sha256": "d1e5cdda23317d13",
        "source_tier": "mfr"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9.9,
          6.5,
          2.32
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "3eb4c99603a4fe837c2fe9308bc174769ded87a785a0df48d2dc441432ee8b4c",
        "checked": "2026-10-22",
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        "sha256": "57e9d210f98cfb3fa437e7fac7608409073c8d37a469edcc76db9073f8610803",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "UTC(Unisonic Tech)",
      "Package": "TO-252-2(DPAK)",
      "Category": "Power Management ICs",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "d1e5cdda23317d13cebd531241058c163e87ba064eee5302a7e7e278dd77053b",
      "rows": [
        {
          "name": "Input - Output Voltage Difference",
          "symbol": "VIN-VOUT",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 40,
          "conditions": "TA=25C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction Temperature",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "C",
          "min": null,
          "typ": null,
          "max": 125,
          "conditions": "TA=25C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Operating Temperature",
          "symbol": "TOPR",
          "kind": "absolute_maximum",
          "unit": "C",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "TA=25C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature",
          "symbol": "TSTG",
          "kind": "absolute_maximum",
          "unit": "C",
          "min": -40,
          "typ": null,
          "max": 150,
          "conditions": "TA=25C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-Ambient Thermal Resistance (TO-252)",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "C/W",
          "min": null,
          "typ": null,
          "max": 112,
          "conditions": "TO-252",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-Case Thermal Resistance (TO-252)",
          "symbol": "θJC",
          "kind": "thermal",
          "unit": "C/W",
          "min": null,
          "typ": null,
          "max": 12,
          "conditions": "TO-252",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Reference Voltage",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 1.2,
          "typ": 1.25,
          "max": 1.3,
          "conditions": "3V≦VIN-VOUT≦40V, 10mA≦IOUT≦1A, PD≦20W",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Line Regulation",
          "symbol": "ΔVOUT/VOUT",
          "kind": "electrical",
          "unit": "%/V",
          "min": null,
          "typ": 0.01,
          "max": 0.04,
          "conditions": "3V≦VIN-VOUT≦40V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Load Regulation (VOUT≦5V)",
          "symbol": "ΔVOUT",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 5,
          "max": 25,
          "conditions": "10mA≦IOUT≦1A, VOUT≦5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Load Regulation (VOUT≧5V)",
          "symbol": "ΔVOUT",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.1,
          "max": 0.5,
          "conditions": "10mA≦IOUT≦1A, VOUT≧5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Adjustable Pin Current",
          "symbol": "IADJ",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 50,
          "max": 100,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Adjustable Pin Current Change",
          "symbol": "ΔIADJ",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 0.2,
          "max": 5,
          "conditions": "3V≦VIN-VOUT≦40V, 10mA≦IOUT≦1A, PD≦20W",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Minimum Load Current for Regulation",
          "symbol": "IL(MIN)",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 3.5,
          "max": 10,
          "conditions": "VIN-VOUT=40V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Maximum Output Current",
          "symbol": "IO(MAX)",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": 0.2,
          "max": 0.3,
          "conditions": "VIN-VOUT=40V, PD≦20W",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Ripple Rejection (CADJ=10μF)",
          "symbol": "RR",
          "kind": "electrical",
          "unit": "dB",
          "min": 66,
          "typ": 80,
          "max": null,
          "conditions": "VOUT=10V, f=120HZ, CADJ=10μF",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Ripple Rejection (CADJ=0)",
          "symbol": "RR",
          "kind": "electrical",
          "unit": "dB",
          "min": null,
          "typ": 65,
          "max": null,
          "conditions": "VOUT=10V, f=120HZ, CADJ=0",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Temperature Stability",
          "symbol": "",
          "kind": "electrical",
          "unit": "%/VOUT",
          "min": null,
          "typ": 0.7,
          "max": null,
          "conditions": "TMIN≦TJ≦TMAX",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "RMS Noise vs. % of VOUT",
          "symbol": "eN",
          "kind": "electrical",
          "unit": "%/VOUT",
          "min": null,
          "typ": 0.003,
          "max": null,
          "conditions": "10HZ≦f≦10KHZ",
          "source_page": 3,
          "source": "datasheet"
        }
      ]
    }
  },
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  "discovery_triggers": [
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  "discovery_pitch": "LM317K-TN3-R (UTC(Unisonic Tech)) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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