# LK112M18TR

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

LK112M18TR from STMicroelectronics, in a SOT-23-5L. 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 | SHDN | input | Shutdown input disables the regulator when it is connected to GND or to a positive voltage less than 0.6 V. |
| 2 | GND | power_in | Ground pin is internally connected to the die attach flag to decrease the total thermal resistance and increase the package ability to dissipate power. |
| 3 | Bypass | passive | Bypass pin with 0.1 µF to improve the noise performance. |
| 4 | OUT | power_out | Output port. |
| 5 | IN | power_in | Input port. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SOT-23-5L |
| Category | Power Management (PMIC) |
| Pins | 5 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Quiescent current, on mode | Iq |  | 175 | 250 | µA | On mode (except ISHDN) | 6 |
| Quiescent current, off mode | Iq |  | 0 | 0.1 | µA | VI = 8V, VSHDN = 0V | 6 |
| Output voltage tolerance | VO | -2 |  | 2 | % | IO = 30mA | 6 |
| Line regulation | ΔVO |  | 0.7 | 20 | mV | VI = VO+1V to VO+6V, VO ≤ 5.6V | 6 |
| Load regulation | ΔVO |  | 15 | 30 | mV | IO = 1 to 60mA | 6 |
| Load regulation | ΔVO |  | 25 | 90 | mV | IO = 1 to 150mA | 6 |
| Shutdown input current | ISHDN |  | 12 | 35 | µA | VSHDN = 1.8V, output on | 6 |
| Output voltage temperature coefficient | ΔVO/TJ |  | 0.09 |  | mV/°C | IO = 10mA | 6 |
| Output current limit | IO |  | 150 |  | mA |  | 6 |
| Supply voltage rejection | SVR |  | 55 |  | dB | VI = VO+1.5V, CBYP = 0.1µF; CO = 10µF, f = 400Hz, IO = 30mA | 6 |
| Output noise voltage | eN |  | 30 |  | µVrms | B = 10Hz to 80kHz, CBYP = 0.1µF; CO = 10µF, VI = VO+1.5V, IO = 60mA | 6 |
| Shutdown input logic, output on | VSHDN |  | 1.8 |  | V | Output on | 6 |
| Shutdown input logic, output off | VSHDN |  | 0.6 |  | V | Output off | 6 |
| DC input voltage | VI |  |  | 16 | V |  | 5 |
| DC input voltage (shutdown pin) | VSHDN |  |  | 16 | V |  | 5 |
| Storage temperature range | TSTG | -55 |  | 150 | °C |  | 5 |
| Operating junction temperature range | TOP | -40 |  | 125 | °C |  | 5 |
| Thermal resistance junction-case | RthJC |  | 81 |  | °C/W | SOT23-5L | 5 |
| Thermal resistance junction-ambient | RthJA |  | 255 |  | °C/W | SOT23-5L | 5 |

## CAD (KiCad official)

- Symbol: `LK112M18TR`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5L (KiCad packages3D, STEP)
- 3D model files: `lk112m18tr-etched.step` / `lk112m18tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lk112m18tr.step` / `lk112m18tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/lk112m18tr.pdf) (18 pp, sha256 `fc1c9dfacf62927c`, retrieved 2026-11-05, tier: manufacturer)
- **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/lk112m18tr-datasheet.pdf)