# KIA7805API-U

**KEC Semicon** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-220F-3

KIA7805API-U from KEC Semicon, in a TO-220F-3. 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 input supply. For the 5V variant (KIA7805) VIN max is 35V; recommended operating VIN 7.0V to 25V. Dropout voltage ~2.0V at IOUT=1A. |
| 2 | GND | power_in | Common ground reference for input and output. Also the thermal path - tab is electrically isolated on TO-220IS (fully-molded / isolated variant). |
| 3 | OUTPUT | power_out | Regulated +5V output (typ 5.0V, 4.8V-5.2V at IOUT=100mA, Tj=25°C). Short-circuit current limit ~1.6A. Compatible with MLCC, tantalum, and low-ESR electrolytic output capacitors. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KEC Semicon |
| Package | TO-220F-3 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `KIA7805API-U`
- `KIA7805API-UAF`

## CAD (KiCad official)

- Symbol: `KIA7805API-U`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220F-3 (KiCad packages3D, STEP)
- 3D model files: `kia7805api-u-etched.step` / `kia7805api-u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `kia7805api-u.step` / `kia7805api-u.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`kia7805api-u.step`](kia7805api-u.step) | 83 KB | You want the bare part, or you mark your own boards. |
| [`kia7805api-u-etched.step`](kia7805api-u-etched.step) | 962 KB | You want the part with `KIA7805API-U` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 259 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:** [KEC Semicon datasheet](docs/kia7805api-u-datasheet.pdf) (20 pp, sha256 `edd644632a33a22d`, 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/kia7805api-u-datasheet.pdf)