main
Ray Set visibility: public 0c1d16c 1d ago
{
  "schema_version": 1,
  "type": "component",
  "slug": "lm317at",
  "title": "LM317AT",
  "brief": "Texas Instruments Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-220. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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    "subcategory": "Voltage Regulators - Linear, Low Drop Out (LDO) Regulators",
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      {
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      {
        "number": "3",
        "name": "VIN",
        "type": "power_in",
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        "guard_notes": [
          "extractor flagged: The TO-220 (NDE) pin table lists VOUT on pin 2 and also on the tab (TAB). Only pin 2 is listed as a "
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        "at": "2026-11-05T22:39:16"
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        "pages": 46,
        "sha256": "d9c37e85dc648c24",
        "source_tier": "mfr"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
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        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
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        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
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        "zmin_mm": -9.75,
        "centre_offset_mm": 0.932,
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        "sha256": "7cb065d935df5771f0ba6e48ddd180863a121af76483dad7f18e667a7b68204a",
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    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "TO-220",
      "Category": "Power Management (PMIC)",
      "Pins": "3"
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    "characteristics": {
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      "source": "datasheet",
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      "rows": [
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          "symbol": "",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "Operating free-air temperature range",
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        {
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          "name": "Reference voltage",
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          "min": 1.238,
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          "max": 1.262,
          "conditions": "TJ = 25°C",
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          "source": "datasheet"
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        {
          "name": "Reference voltage",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 1.225,
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          "max": 1.27,
          "conditions": "3 V ≤ (VIN − VOUT) ≤ 40 V, 10 mA ≤ IOUT ≤ IMAX, over full operating temperature range",
          "source_page": 6,
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        {
          "name": "Line regulation",
          "symbol": "",
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        {
          "name": "Line regulation",
          "symbol": "",
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          "min": null,
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          "conditions": "3 V ≤ (VIN − VOUT) ≤ 40 V, over full operating temperature range",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Load regulation",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
          "min": null,
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          "max": 0.5,
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        {
          "name": "Load regulation",
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          "kind": "electrical",
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          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Thermal regulation",
          "symbol": "",
          "kind": "electrical",
          "unit": "%/W",
          "min": null,
          "typ": 0.04,
          "max": 0.07,
          "conditions": "20-ms pulse",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Adjustment pin current",
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          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 50,
          "max": 100,
          "conditions": "over full operating temperature range",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Adjustment pin current change",
          "symbol": "ΔIADJ",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 0.2,
          "max": 5,
          "conditions": "10 mA ≤ IOUT ≤ IMAX, 3 V ≤ (VIN − VOUT) ≤ 40 V, over full operating temperature range",
          "source_page": 6,
          "source": "datasheet"
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        {
          "name": "Temperature stability",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 1,
          "max": null,
          "conditions": "TMIN ≤ TJ ≤ TMAX, over full operating temperature range",
          "source_page": 6,
          "source": "datasheet"
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        {
          "name": "Minimum load current",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 3.5,
          "max": 10,
          "conditions": "(VIN − VOUT) = 40 V, over full operating temperature range",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Current limit",
          "symbol": "ILIM",
          "kind": "electrical",
          "unit": "A",
          "min": 1.5,
          "typ": 2.2,
          "max": 3.4,
          "conditions": "(VIN − VOUT) ≤ 15 V, SOT-223 and TO-220 packages, over full operating temperature range",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Current limit",
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          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": 0.15,
          "max": 0.4,
          "conditions": "(VIN − VOUT) = 40 V, SOT-223 and TO-220 packages",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "RMS output noise",
          "symbol": "",
          "kind": "electrical",
          "unit": "% of VOUT",
          "min": null,
          "typ": 0.003,
          "max": null,
          "conditions": "10 Hz ≤ f ≤ 10 kHz",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Ripple rejection ratio",
          "symbol": "",
          "kind": "electrical",
          "unit": "dB",
          "min": null,
          "typ": 65,
          "max": null,
          "conditions": "VOUT = 10 V, f = 120 Hz, CADJ = 0 μF, over full operating temperature range",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Ripple rejection ratio",
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          "source_page": 6,
          "source": "datasheet"
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          "name": "Long-term stability",
          "symbol": "",
          "kind": "electrical",
          "unit": "%",
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          "conditions": "TJ = 125°C, 1000 hrs",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-ambient thermal resistance (NDE TO-220)",
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          "conditions": "",
          "source_page": 5,
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        },
        {
          "name": "Junction-to-case (top) thermal resistance (NDE TO-220)",
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        {
          "name": "Junction-to-case (bottom) thermal resistance (NDE TO-220)",
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          "unit": "°C/W",
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      ]
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  "discovery_pitch": "LM317AT (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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