# LTP3558-33XT4

**Linearin** · Linear Voltage Regulators (LDO) · SOT-89-3

LTP3558-33XT4 from Linearin, in a SOT-89-3. 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. |
| 2 | IN | power_in | Supply input pin; must be closely decoupled to GND with a 1μF or greater ceramic capacitor. |
| 3 | OUT | power_out | Output pin; bypass with a 1μF or greater ceramic capacitor from this pin to ground. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Linearin |
| Package | SOT-89-3 |
| Category | Power Supply Chip |
| 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 |
|---|---|---|---|---|---|---|---|
| Dropout Voltage | VDROP |  |  | 820 | mV | VOUT= 3.3 V, IOUT = 150mA | 5 |
| Dropout Voltage | VDROP |  |  | 520 | mV | VOUT= 3.3 V, IOUT = 100mA | 5 |
| DC Supply Quiescent Current | IQ |  | 1.5 | 3 | µA |  | 5 |
| Output Voltage Line Regulation | RegLINE |  | 0.01 | 0.04 | %/V | VIN = VOUT +1V to 30V, IOUT = 10mA | 5 |
| Output Voltage Load Regulation | RegLOAD |  | 5 | 20 | mV | IOUT from 1mA to 150mA, VIN=VOUT+2V | 5 |
| Output Voltage Load Regulation | RegLOAD |  | 25 | 60 | mV | IOUT from 1mA to 150mA, VIN=10V | 5 |
| Maximum Output Current | IOUT |  |  | 200 | mA | VIN = VOUT +1V | 5 |
| Input Voltage Operation Range | VIN |  |  | 36 | V |  | 5 |
| Short Current Protection | ISHORT |  | 100 |  | mA | OUT short to GND | 5 |
| Output Voltage Accuracy |  | -2 |  | 2 | % | Worst-case over load, line, process and temperature (general description) | 1 |
| IN pin to GND pin |  | -0.3 |  | 40 | V |  | 4 |
| OUT pin to GND pin |  | -0.3 |  | 6 | V |  | 4 |
| Operating Junction Temperature |  | -40 |  | 125 | °C |  | 4 |
| Storage Temperature |  | -65 |  | 150 | °C |  | 4 |
| Lead Temperature |  |  |  | 300 | °C | Soldering, 10 sec | 4 |
| ESD (HBM mode) |  | -2000 |  | 2000 | V | ESDA/JEDEC JS-001-2017 | 4 |
| Recommended output capacitance |  | 1 |  | 10 | µF | Ceramic, X7R or X5R | 4 |
| Recommended output capacitor ESR |  | 5 |  | 100 | mΩ |  | 4 |
| Recommended input capacitance |  | 1 |  | 10 | µF | Ceramic, between IN and GND | 3 |
| Thermal Resistance (Junction to Ambient), SOT-89 |  |  | 135 |  | °C/W | Junction to ambient | 4 |
| Output Noise | eN |  | 90 |  | µVRMS | 10Hz to 100kHz, IOUT = 30mA | 5 |

## CAD (KiCad official)

- Symbol: `LTP3558-33XT4`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files: `ltp3558-33xt4-etched.step` / `ltp3558-33xt4-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ltp3558-33xt4.step` / `ltp3558-33xt4.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Linearin datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588945642622631936) (10 pp, sha256 `006d27c5e87301f9`, retrieved 2026-10-18, 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/ltp3558-33xt4-datasheet.pdf)