# U1117-3.3V-SOT89

**UNI-SEMIC** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89

U1117-3.3V-SOT89 from UNI-SEMIC, in a SOT-89. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground reference pin of the regulator. |
| 2 | VOUT | power_out | Regulated output voltage pin; the fixed 3.3V version delivers up to 1A (datasheet maximum output current is 1.4A) with 3.234V to 3.366V accuracy over 0 to 1A load. |
| 3 | VIN | power_in | Input voltage pin, with a maximum input voltage of 15V, recommended to be bypassed with a 10uF tantalum capacitor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UNI-SEMIC |
| Package | SOT-89 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## 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 (U1117-3.3V) | Vout | 3.234 | 3.3 | 3.366 | V | 0≤Iout≤1A, Vin=5.3V | 4 |
| Line regulation (U1117-3.3V) | △Vout |  | 0.03 | 0.2 | %/V | Iout=10mA, 4.8V≤Vin≤12V | 4 |
| Load regulation (U1117-3.3) | △Vout |  | 6 | 24 | mV | Vin=4.8V, 10mA≤Iout≤1A | 4 |
| Dropout voltage | Vdrop |  | 1.15 | 1.3 | V | Iout=100mA | 4 |
| Dropout voltage | Vdrop |  | 1.3 | 1.5 | V | Iout=1A | 4 |
| Quiescent current (U1117-3.3V) | Iq |  | 1.8 | 5 | mA | U1117-3.3V, Vin=12V | 4 |
| Max operating junction temperature | Tj |  |  | 150 | ℃ |  | 4 |
| Ambient temperature | Ta | -40 |  | 85 | ℃ |  | 4 |
| Storage temperature | Ts | -40 |  | 150 | ℃ |  | 4 |
| Recommended operating junction temperature | Tj | -20 |  | 125 | ℃ |  | 4 |

## CAD (KiCad official)

- Symbol: `U1117-3.3V-SOT89`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `u1117-3-3v-sot89-etched.step` / `u1117-3-3v-sot89-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `u1117-3-3v-sot89.step` / `u1117-3-3v-sot89.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UNI-SEMIC datasheet](docs/u1117-3-3v-sot89-datasheet.pdf) (8 pp, sha256 `c81808acde9c7554`, retrieved 2026-11-05, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/u1117-3-3v-sot89-datasheet.pdf)