L7905 Negative Voltage Regulator

@@ -0,0 +1,49 @@+# L7905++**STMicroelectronics** · Linear Regulator (LDO) · TO-220++The L7905 is a three-terminal fixed negative-voltage regulator from ST's L79xx series, delivering a stable -5 V output at up to 1.5 A with adequate heat sinking. It pairs with a positive 78xx regulator to build split (dual-rail) supplies for op-amps and analog circuits, and needs only input and output capacitors.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | GND | power_in | Common / reference ground for both input and output. The output voltage is regulated with respect to this pin. |+| 2 | IN | power_in | Unregulated negative supply input. Accepts DC input voltage down to -35 V (abs. max). A 2.2 µF input capacitor (CI) to GND is recommended to reject line transients. In the TO-220 / TO-220FP / D²PAK packages the mounting tab is internally connected to this pin. |+| 3 | OUT | power_out | Regulated negative output. Delivers a fixed -5 V (typ.) with respect to GND at up to 1.5 A when adequately heat-sunk. A 1 µF output capacitor (CO) to GND is required for stability. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Fixed negative linear regulator |+| Output voltage | -5 V |+| Output current | Up to 1.5 A (with heatsink) |+| Line/load regulation | Internally set |+| Package | TO-220 (3-lead) |+| Operating temperature | 0 C to 125 C (junction) |++## Ordering variants++- `L7905CV`+- `L7905ACV`+- `L7905CP`+- `L7905ACP`+- `L7905CD2T`+- `L7905ACD2T`++## CAD (KiCad official)++- Symbol: `l7905.kicad_sym`+- Footprint: `l7905.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:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/l79.pdf) (29 pp, sha256 `6bdb1e0a1c61a10d`, 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/l7905-datasheet.pdf)

@@ -0,0 +1,37 @@+{+  "slug": "l7905",+  "version": "0.1.0",+  "type": "component",+  "description": "Fixed -5 V negative-voltage linear regulator, up to 1.5 A, in the L79xx series.",+  "tags": [+    "regulator",+    "linear",+    "negative",+    "fixed",+    "pmic",+    "st",+    "to-220"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "l7905.kicad_sym",+    "l7905.kicad_mod",+    "l7905.glb",+    "l7905.step",+    "docs/hero.png",+    "docs/l7905-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file