# L7809CV-DG

**STMicroelectronics** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-220

L7809CV-DG from STMicroelectronics, in a TO-220. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | INPUT | power_in | Unregulated positive supply input (V_I). Recommended input range for a 9 V output part is roughly 11.5 V to 35 V (V_O + dropout, up to absolute-max 35 V). A 0.33 uF ceramic bypass capacitor to GND is recommended when the regulator is located far from the power supply filter. |
| 2 | GROUND | power_in | Common ground reference for both input and output. Also electrically connected to the mounting tab of the TO-220 package. |
| 3 | OUTPUT | power_out | Regulated +9 V output (V_O). Capable of delivering up to 1.5 A with adequate heatsinking. A 0.1 uF ceramic output capacitor is recommended for transient response. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | TO-220 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `L7809CV-DG`
- `L7809CP`
- `L7809CD2T-TR`

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Output voltage | VO | 8.64 | 9 | 9.36 | V | TJ = 25°C | 20 |
| Output voltage | VO | 8.55 | 9 | 9.45 | V | IO = 5 mA to 1 A, VI = 11.5 to 22 V | 20 |
| Line regulation | ΔVO |  |  | 180 | mV | VI = 11.5 to 26 V, TJ = 25°C | 20 |
| Line regulation | ΔVO |  |  | 90 | mV | VI = 12 to 18 V, TJ = 25°C | 20 |
| Load regulation | ΔVO |  |  | 180 | mV | IO = 5 mA to 1.5 A, TJ = 25°C | 20 |
| Load regulation | ΔVO |  |  | 90 | mV | IO = 250 to 750 mA, TJ = 25°C | 20 |
| Quiescent current | Id |  |  | 8 | mA | TJ = 25°C | 20 |
| Quiescent current change | ΔId |  |  | 0.5 | mA | IO = 5 mA to 1 A | 20 |
| Quiescent current change | ΔId |  |  | 1 | mA | VI = 11.5 to 26 V | 20 |
| DC input voltage (for VO = 5 to 18 V) | VI |  |  | 35 | V | for VO = 5 to 18 V | 7 |
| Operating junction temperature range (L78xxC, L78xxAC) | TOP | 0 |  | 125 | °C | for L78xxC, L78xxAC | 7 |
| Storage temperature range | TSTG | -65 |  | 150 | °C |  | 7 |
| Thermal resistance junction-case (TO-220) | RthJC |  | 5 |  | °C/W |  | 7 |
| Thermal resistance junction-ambient (TO-220) | RthJA |  | 50 |  | °C/W |  | 7 |

## CAD (KiCad official)

- Symbol: `L7809CV-DG`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220 (KiCad packages3D, STEP)
- 3D model files: `l7809cv-dg-etched.step` / `l7809cv-dg-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `l7809cv-dg.step` / `l7809cv-dg.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`l7809cv-dg.step`](l7809cv-dg.step) | 83 KB | You want the bare part, or you mark your own boards. |
| [`l7809cv-dg-etched.step`](l7809cv-dg-etched.step) | 880 KB | You want the part with `L7809CV-DG` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 229 faces against 48 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/l7809cv-dg.pdf) (58 pp, sha256 `83f591a9457f6fe3`, 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/l7809cv-dg-datasheet.pdf)