L7908 Negative Voltage Regulator

@@ -0,0 +1,49 @@+# L7908++**STMicroelectronics** · Linear Regulator (LDO) · TO-220++The L7908 is a three-terminal fixed negative-voltage regulator from ST's L79xx series, delivering a stable -8 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, needing only input and output capacitors.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | GND | power_in | Common/ground return. For the L79 negative regulator family the ground pin is pin 1 on TO-220 / TO-220FP (this differs from the L78 positive-regulator pinout). |+| 2 | IN | power_in | Unregulated negative input voltage. Recommended operating range for the -8 V version is roughly -11 V to -23 V (V_I max abs = -35 V). A 2.2 µF bypass capacitor to GND is required close to this pin. |+| 3 | OUT | power_out | Regulated -8 V output, up to 1.5 A with adequate heat sinking. Typical dropout 1.1 V at 1 A. A 1 µF output capacitor to GND is required for loop stability. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Fixed negative linear regulator |+| Output voltage | -8 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++- `L7908CV`+- `L7908ACV`+- `L7908CP`+- `L7908ACP`+- `L7908CD2T`+- `L7908ACD2T`++## CAD (KiCad official)++- Symbol: `l7908.kicad_sym`+- Footprint: `l7908.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/l7908-datasheet.pdf)

@@ -0,0 +1,37 @@+{+  "slug": "l7908",+  "version": "0.1.0",+  "type": "component",+  "description": "Fixed -8 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",+    "l7908.kicad_sym",+    "l7908.kicad_mod",+    "l7908.glb",+    "l7908.step",+    "docs/hero.png",+    "docs/l7908-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file