LM2937 500 mA LDO Regulator

@@ -0,0 +1,47 @@+# LM2937++**Texas Instruments** · Linear Regulator (LDO) · TO-220++The LM2937 is a 500 mA low-dropout linear regulator with a fixed output. It tolerates reverse-battery connection and load-dump transients, making it a common choice for automotive and industrial supplies where the input rail is noisy or unregulated. It needs only a modest output capacitor for stability.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | INPUT | power_in | 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. |+| 2 | GND | power_in | 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. |+| 3 | OUTPUT | power_out | 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. |++## Key specifications++| Parameter | Value |+|---|---|+| 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 |++## Ordering variants++- `LM2937ET`+- `LM2937ES`+- `LM2937IMP`++## CAD (KiCad official)++- Symbol: `lm2937.kicad_sym`+- Footprint: `lm2937.kicad_mod`+- 3D model: TO-220 body from KiCad `Package_TO_SOT_THT/TO-220-3_Vertical`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm2937.pdf) (34 pp, sha256 `7f5179c841e4236e`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/lm2937-datasheet.pdf)

@@ -0,0 +1,37 @@+{+  "slug": "lm2937",+  "version": "0.1.0",+  "type": "component",+  "description": "500 mA low-dropout fixed regulator with reverse-battery and load-dump protection.",+  "tags": [+    "regulator",+    "ldo",+    "low-dropout",+    "automotive",+    "protection",+    "ti",+    "to-220"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "lm2937.kicad_sym",+    "lm2937.kicad_mod",+    "lm2937.glb",+    "lm2937.step",+    "docs/hero.png",+    "docs/lm2937-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file