UA7805

@@ -0,0 +1,47 @@+# UA7805++**Texas Instruments** · Fixed 5 V linear regulator (78xx) · TO-220++Fixed 5 V positive linear voltage regulator in a 3-terminal TO-220 package, the 7805 that has powered hobby and industrial boards for decades. Give it an unregulated input from about 7 V up to 35 V and it holds the output at 5 V while sourcing up to 1.5 A, with internal current limiting, safe-operating-area protection, and thermal shutdown so a short or overheat cannot destroy it. It needs roughly 2 V of headroom (dropout), so it is not an LDO. Add a small input and output capacitor and it is a complete supply.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | INPUT | power_in | Unregulated positive input voltage. Recommended 7.5 V to 20 V (35 V absolute max) for a 5-V output; requires ≥7.5 V to maintain line regulation. A 0.22-µF (or larger) ceramic bypass capacitor to GND is required when the regulator is far from the supply filter. |+| 2 | GND | power_in | Ground reference for both input and output. Also serves as the thermal reference; on TO-220/TO-263/SOT-223 the exposed tab/pad is electrically connected to this pin and should be tied to the ground plane for heat sinking. |+| 3 | OUTPUT | power_out | Regulated +5-V output (4.8 V to 5.2 V typical over line/load; 4.75 V to 5.25 V worst case). Delivers up to 1.5 A with adequate heat sinking; internally current-limited to ~2.1 A short-circuit. A 0.1-µF ceramic output capacitor to GND improves transient response but is not required for stability. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Fixed positive linear regulator |+| Output voltage | 5 V fixed |+| Output current | up to 1.5 A |+| Input voltage | 7-35 V |+| Dropout | ~2 V (not LDO) |+| Protection | Current limit + SOA + thermal shutdown |+| Line regulation | typ. 4 mV |+| Package | TO-220 (3-lead) |++## Ordering variants++- `UA7805CKC (TO-220)`+- `UA7805CKCS (TO-220, short shipping)`++## CAD (KiCad official)++- Symbol: `Regulator_Linear:uA7805`+- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`+- 3D model: TO-220 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm340.pdf) (37 pp, sha256 `ce0caf2298560e42`, 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/ua7805-datasheet.pdf)

@@ -0,0 +1,36 @@+{+  "slug": "ua7805",+  "version": "0.1.0",+  "type": "component",+  "description": "TI fixed 5 V, 1.5 A positive linear regulator, TO-220. Internal thermal + short-circuit protection. Datasheet-verified.",+  "tags": [+    "component",+    "voltage-regulator",+    "linear-regulator",+    "7805",+    "5v",+    "to-220",+    "texas-instruments"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "ua7805.kicad_sym",+    "ua7805.kicad_mod",+    "ua7805.glb",+    "docs/hero.png",+    "docs/ua7805-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file