LM2937 500 mA LDO Regulator

{
  "schema_version": 1,
  "type": "component",
  "slug": "lm2937",
  "title": "LM2937 500 mA LDO Regulator",
  "brief": "500 mA low-dropout fixed regulator with reverse-battery and load-dump protection.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "regulator",
    "ldo",
    "low-dropout",
    "automotive",
    "protection",
    "ti",
    "to-220"
  ],
  "component": {
    "mpn": "LM2937",
    "manufacturer": "Texas Instruments",
    "package": "TO-220",
    "pin_count": 3,
    "category": "Power Management",
    "subcategory": "Linear Regulator (LDO)",
    "datasheet": "https://www.ti.com/lit/ds/symlink/lm2937.pdf",
    "parts": {
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      "footprint": "lm2937.kicad_mod",
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      "model_3d_step_plain": "lm2937.step",
      "lbr": "lm2937.lbr"
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "INPUT",
        "type": "power_in",
        "description": "Unregulated voltage input. Operating range up to 26 V continuous (60 V transient, <=100 ms). Requires >= VOUT + 1 V for regulation; typical dropout 0.5 V at full rated load. Recommend a 0.1 uF input bypass capacitor."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the regulator. Quiescent current ~10 mA at full load (2 mA typical at light load with sufficient headroom) returns through this pin."
      },
      {
        "number": "3",
        "name": "OUTPUT",
        "type": "power_out",
        "description": "Regulated voltage output (5/8/10/12/15 V option depending on suffix). Delivers up to 500 mA (400 mA for SOT-223). Requires an output bypass capacitor (10 uF nominal) with ESR up to 3 ohm for stability; see Detailed Design Procedure."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/lm2937.pdf",
        "pages": 34,
        "sha256": "7f5179c841e4236e",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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      "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": [
          10.25,
          4.455,
          28.525
        ],
        "zmin_mm": -9.75,
        "centre_offset_mm": 0.932,
        "footprint_binding": "identity",
        "sha256": "7cb065d935df5771f0ba6e48ddd180863a121af76483dad7f18e667a7b68204a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
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        "units": "mm",
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        "seat": "body on z = 0, through-hole leads below",
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        "sha256": "a30206ae64d5d580cff1915a24d7fce73b07555bfcc3cf785a2f3ffd2dcfc0de",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Fixed low-dropout linear regulator",
      "Output current": "500 mA",
      "Dropout voltage": "0.5 V typ at 500 mA",
      "Input voltage": "Up to 26 V (load-dump to 60 V)",
      "Protection": "Reverse battery, thermal, short circuit",
      "Package": "TO-220 (3-lead)",
      "Operating temperature": "-40 C to 125 C"
    }
  },
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
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  ],
  "discovery_triggers": [
    "low-dropout regulator",
    "automotive regulator",
    "5V LDO",
    "reverse battery protection"
  ],
  "discovery_pitch": "A rugged 500 mA LDO with reverse-battery and transient protection, built for automotive and noisy supplies.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
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  "variants": [
    {
      "mpn": "LM2937ET",
      "kind": "unknown"
    },
    {
      "mpn": "LM2937ES",
      "kind": "unknown"
    },
    {
      "mpn": "LM2937IMP",
      "kind": "unknown"
    }
  ]
}