# LDL1117S25R

**STMicroelectronics** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-4

LDL1117S25R from STMicroelectronics, in a SOT-223-4. 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 | GND | power_in | Ground reference for the regulator. Common return for both input and output currents. |
| 2 | VOUT | power_out | Regulated fixed output voltage (2.5 V for LDL1117S25R). Delivers up to 1.2 A; requires a 4.7 µF output capacitor for stability. Internally tied to the SOT-223 tab. |
| 3 | VIN | power_in | Unregulated input supply, 2.5 V to 18 V (20 V AMR). Requires a 1 µF input capacitor close to the pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SOT-223-4 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `LDL1117S25R`

## CAD (KiCad official)

- Symbol: `LDL1117S25R`
- Footprint: `Package_TO_SOT_SMD:SOT-223`
- 3D model: SOT-223-4 (KiCad packages3D, STEP)
- 3D model files: `ldl1117s25r-etched.step` / `ldl1117s25r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ldl1117s25r.step` / `ldl1117s25r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](docs/ldl1117s25r-datasheet.pdf) (23 pp, sha256 `0533b5ea67d7b205`, retrieved 2026-08-17, tier: lcsc)
- **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/ldl1117s25r-datasheet.pdf)