LM2931

@@ -0,0 +1,47 @@+# LM2931++**Texas Instruments** · LDO regulator · TO-220++Low-dropout regulator built to survive an automotive supply: it withstands load-dump transients to 60 V and a reverse-battery connection, and it holds regulation with less than 0.6 V of input-to-output headroom. The quiescent current stays low even near dropout, so it suits always-on car electronics running off the battery directly. It delivers 100 mA at a fixed 3.3 V (this option) or 5 V. A rugged linear regulator for 12 V automotive and industrial rails.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | IN | power_in | Unregulated input, operating range up to 26 V (survives 50 V load dump on LM2931-N, 60 V on LM2931A/C). A 0.1 µF bypass is required if the regulator is remote from the supply filter. |+| 2 | GND | power_in | Device ground / return. In TO-220 and DDPAK/TO-263, the tab is electrically connected to GND. |+| 3 | OUT | power_out | Regulated output. Delivers fixed 3.3 V or 5 V (±3.8% for A grade) at up to 100 mA. Requires ≥100 µF low-ESR output capacitor for stability. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Low-dropout regulator (automotive) |+| Output current | 100 mA |+| Dropout | < 0.6 V |+| Transient survival | Load dump to 60 V, reverse battery to -50 V |+| Quiescent current | Low (~0.4 mA) |+| Output | 3.3 V (fixed option) |+| Package | TO-220 |++## Ordering variants++- `LM2931T-3.3 (TO-220)`+- `LM2931AT-5.0 (TO-220)`+- `LM2931D (SOIC-8)`++## CAD (KiCad official)++- Symbol: `Regulator_Linear2:LM2931-3.3_TO220 (KiCad official)`+- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`+- 3D model: TO-220 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm2931-n.pdf) (35 pp, sha256 `45c959192188b8f1`, 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/lm2931-datasheet.pdf)

@@ -0,0 +1,38 @@+{+  "slug": "lm2931",+  "version": "0.1.0",+  "type": "component",+  "description": "TI automotive low-dropout regulator, TO-220. 100 mA, load-dump and reverse-battery protected, low quiescent. Datasheet-verified.",+  "tags": [+    "component",+    "power",+    "ldo",+    "linear-regulator",+    "automotive",+    "to-220",+    "texas-instruments"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "lm2931.kicad_sym",+    "lm2931.kicad_mod",+    "lm2931.glb",+    "lm2931.step",+    "lm2931.lbr",+    "docs/hero.png",+    "docs/lm2931-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file