L7912 Negative Voltage Regulator

@@ -0,0 +1,49 @@+# L7912++**STMicroelectronics** · Linear Regulator (LDO) · TO-220++The L7912 is a three-terminal fixed negative-voltage regulator from ST's L79xx series, delivering a stable -12 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 / ground reference for the regulator. For negative regulators this is the 0 V node; the output produces a -12 V rail with respect to this pin. |+| 2 | IN | power_in | Unregulated negative input voltage (VI). Must be more negative than the output by at least the dropout voltage (~1.1 V typ). Absolute maximum -35 V. Requires a 2.2 µF input capacitor (CI) close to the pin per the recommended test circuit. |+| 3 | OUT | power_out | Regulated -12 V output (VO), up to 1.5 A with adequate heat sinking. Tolerance is 2% (AC version) or 4% (C version) at 25 °C. Requires a 1 µF output capacitor (CO) for stability per the recommended test circuit. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Fixed negative linear regulator |+| Output voltage | -12 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++- `L7912CV`+- `L7912ACV`+- `L7912CP`+- `L7912ACP`+- `L7912D2T`+- `L7912CD2T`++## CAD (KiCad official)++- Symbol: `l7912.kicad_sym`+- Footprint: `l7912.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/l7912-datasheet.pdf)

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