L7818 18 V Linear Regulator

@@ -0,0 +1,49 @@+# L7818++**STMicroelectronics** · Linear Regulator (LDO) · TO-220++The L7818 is a three-terminal fixed positive-voltage regulator from ST's L78xx (7800) series, delivering a stable 18 V output at up to 1.5 A with adequate heat sinking. It powers higher-voltage rails from an unregulated supply, needing only input and output capacitors.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | INPUT | power_in | Unregulated DC input supply. Absolute maximum V_I = 35 V for V_O ≤ 18 V variants. A 0.33 µF ceramic bypass to GND is recommended close to the pin for stability when the regulator is far from the bulk filter capacitor. |+| 2 | GROUND | power_in | Common ground reference for both input and output. In TO-220 and TO-220FP this pin is electrically connected to the mounting tab. Return currents for both C_I and C_O bypass capacitors should tie to this pin with a short, low-impedance path. |+| 3 | OUTPUT | power_out | Regulated +18 V output (2 % tolerance on A-version parts). Delivers up to 1.5 A with adequate heatsinking; internally current-limited and SOA-protected. A 0.1 µF ceramic output capacitor is recommended to improve transient response. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Fixed positive linear regulator |+| Output voltage | 18 V |+| Output current | Up to 1.5 A (with heatsink) |+| Dropout voltage | 2 V typ |+| Package | TO-220 (3-lead) |+| Operating temperature | 0 C to 125 C (junction) |++## Ordering variants++- `L7818CV`+- `L7818CP`+- `L7818CD2T`+- `L7818D2T`+- `L7818CDT`+- `L7818DT`++## CAD (KiCad official)++- Symbol: `l7818.kicad_sym`+- Footprint: `l7818.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/l78.pdf) (55 pp, sha256 `ccba643d1b7ced87`, 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/l7818-datasheet.pdf)

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