# WL2803E28-5

**WILLSEMI Will Semicon** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5L

WL2803E28-5 from WILLSEMI Will Semicon, in a SOT-23-5L. 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 | VIN | power_in | Input supply pin, 2.5 V to 5.5 V operating range (absolute max -0.3 V to 6.5 V). Bypass to GND with a 4.7 µF ceramic capacitor placed close to the pin. |
| 2 | GND | power_in | Device ground reference for both the input supply and output regulation feedback path. |
| 3 | EN | input | Active-high enable input. VENH ≥ 1.2 V turns the regulator on; VENL ≤ 0.4 V forces shutdown (ISHDN ≈ 0.1 µA typ). Do not leave floating. |
| 4 | NC | unconnected | No internal connection. Leave floating or tie to GND for mechanical strain relief. |
| 5 | VOUT | power_out | Regulated 2.8 V output (WL2803E28-5), up to 500 mA continuous with 130 mV typical dropout. Requires a 4.7 µF ceramic output capacitor (≥10 µF recommended when VOUT < 2 V). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | WILLSEMI Will Semicon |
| Package | SOT-23-5L |
| Category | PMIC |
| Pins | 5 |

## Ordering variants

- `WL2803E28-5/TR`

## CAD (KiCad official)

- Symbol: `WL2803E28-5`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5L (KiCad packages3D, STEP)
- 3D model files: `wl2803e28-5-etched.step` / `wl2803e28-5-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `wl2803e28-5.step` / `wl2803e28-5.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [WILLSEMI Will Semicon datasheet](docs/wl2803e28-5-datasheet.pdf) (None pp, sha256 `9792bb099f4840d0`, 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/wl2803e28-5-datasheet.pdf)