L7809 9 V Linear Regulator

@@ -0,0 +1,49 @@+# L7809++**STMicroelectronics** · Linear Regulator (LDO) · TO-220++The L7809 is a three-terminal fixed positive-voltage regulator from ST's L78xx (7800) series, delivering a stable 9 V output at up to 1.5 A with adequate heat sinking. It is the classic linear regulator for powering logic and analog rails from a higher unregulated supply, needing only input and output capacitors.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | INPUT | power_in | Unregulated DC input. Absolute maximum 35 V (for VO = 5-18 V variants). Requires a 0.33 µF bypass capacitor close to the pin. |+| 2 | GROUND | power_in | Common ground reference. Also connected internally to the mounting tab on TO-220/TO-220FP and to the exposed pad on DPAK/D²PAK. |+| 3 | OUTPUT | power_out | Regulated +9 V output, up to 1.5 A with adequate heatsinking. Requires a 0.1 µF output capacitor for stability. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Fixed positive linear regulator |+| Output voltage | 9 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++- `L7809CV`+- `L7809CP`+- `L7809CDT`+- `L7809CDT-TR`+- `L7809CD2T`+- `L7809CD2T-TR`++## CAD (KiCad official)++- Symbol: `l7809.kicad_sym`+- Footprint: `l7809.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/l7809-datasheet.pdf)

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