# AP131-18WG-7

**Diodes Incorporated** · Linear Voltage Regulators (LDO) · SOT-25

AP131-18WG-7 from Diodes Incorporated, in a SOT-25. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model). Symbol and footprint from KiCad-official CAD; the 3D model is generated from the datasheet's package dimensions.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | IN | power_in | Input voltage pin; the datasheet recommends VIN from 2.7 V to 5.5 V, and the absolute maximum input voltage (VCC) is 6 V. |
| 2 | GND | power_in | Ground pin for the regulator. |
| 3 | EN | input | Enable pin that turns the output on when driven above 1.5 V (VENON) and off when at or below 0.8 V (VENOFF); it must not exceed VIN. |
| 4 | BP | passive | Band-gap reference node where an external capacitor (CBP) can be connected to reduce output noise. |
| 5 | OUT | power_out | Regulated output voltage pin, rated for up to 300 mA output current (IOUT 0 to 300 mA recommended). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-25 |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Dropout Voltage | VDROP |  | 400 | 500 | mV | IL = 300mA | 3 |
| Current Limit | ILIMIT | 350 | 450 |  | mA | VIN = 5V, VOUT = 0V | 3 |
| Short Circuit Current | Ishort |  | 150 | 300 | mA | VOUT < 1.05V | 3 |
| Line Regulation | ΔVLINE |  | 0.1 | 0.3 | %/V | IOUT = 1mA, VIN = (VOUT +1V) to 5.5V | 3 |
| Load Regulation | ΔVLOAD |  | 30 | 35 | mV | IL = 1~300mA, VIN = 5V | 3 |
| Output Voltage Accuracy | ΔVOUT | -2 |  | 2 | % | IL = 1mA, VIN = 5V | 3 |
| Output Voltage Temperature Coefficient |  |  | 50 | 150 | PPM/°C |  | 3 |
| Standby Current | ISB |  |  | 5 | μA | IL = 0mA, VIN = 5V, EN = 0V | 3 |
| Quiescent Current | IQ |  | 50 | 100 | μA | IL = 0mA, VIN = 5V, EN = 5V | 3 |
| Enable Pin Current | IEN |  |  | 0.1 | μA |  | 3 |
| Enable Pin Voltage (ON) | VENON | 1.5 |  |  | V | Output ON | 3 |
| Enable Pin Voltage (OFF) | VENOFF | 0 |  | 0.8 | V | Output OFF | 3 |
| Input Voltage | VIN | 2.7 |  | 5.5 | V |  | 2 |
| Output Current | IOUT | 0 |  | 300 | mA |  | 2 |
| Operating Ambient Temperature | TA | -40 |  | 85 | °C |  | 2 |
| Input Voltage (absolute maximum) | VCC |  |  | 6 | V |  | 2 |
| Operating Junction Temperature Range | TOP | -40 |  | 125 | °C |  | 2 |
| Storage Temperature Range | TST | -65 |  | 150 | °C |  | 2 |
| Power Dissipation | PD |  |  | 250 | mW | PD@ TA = 25°C SOT25 | 2 |
| Thermal Resistance Junction-to-Ambient | ΘJA |  | 163 |  | °C/W | SOT25 (Note 8) | 3 |
| Thermal Resistance Junction-to-Case | ΘJC |  | 53 |  | °C/W | SOT25 (Note 8) | 3 |

## CAD (land: KiCad; 3D: generated from the datasheet)

- Symbol: `AP131-18WG-7`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-25, generated on the KiCad land (body 1.6 x 2.8 mm, terminals on the pads, 1.1 mm tall, datasheet A, nominal). KiCad's stock model for this land is taller than the datasheet allows, so the model is generated from the datasheet drawing; the dimensions come from the datasheet drawing where it was read and are defaults otherwise (see provenance.model_3d_generated), not the manufacturer's CAD (STEP)
- 3D model files: `ap131-18wg-7-etched.step` / `ap131-18wg-7-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ap131-18wg-7.step` / `ap131-18wg-7.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Diodes Incorporated datasheet](https://www.diodes.com/assets/Datasheets/AP131-18WG-7.pdf) (7 pp, sha256 `3398951f7d054688`, retrieved 2026-11-13, 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:** land: KiCad official libraries (CC-BY-SA 4.0); 3D: generated from the datasheet's package dimensions (provenance.model_3d_generated).

[Datasheet PDF](docs/ap131-18wg-7-datasheet.pdf)