# AP2125KS-1.8TRG1

**Diodes Incorporated** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SC-70-5

AP2125KS-1.8TRG1 from Diodes Incorporated, in a SC-70-5. 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 | VIN | power_in | Input voltage pin; recommended range VOUT+0.5V to 6V, absolute maximum 6.5V. |
| 2 | GND | power_in | Ground. |
| 3 | CE | input | Active high enable input; logic high (≥1.5V) enables the output, logic low (≤0.4V) shuts the regulator down. |
| 4 | NC | unconnected | No connection. |
| 5 | VOUT | power_out | Regulated output voltage, 1.8V fixed for this version, with 300mA minimum output current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SC-70-5 |
| 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 |
|---|---|---|---|---|---|---|---|
| Output Voltage | VOUT | 1.764 | 1.8 | 1.836 | V | VIN = 2.8V, 1mA ≤ IOUT ≤ 30mA | 4 |
| Input Voltage | VIN |  |  | 6 | V |  | 4 |
| Maximum Output Current | IOUT(MAX) | 300 | 360 |  | mA | VIN-VOUT = 1V, VOUT = 1.76V | 4 |
| Load Regulation | VRLOAD |  | 6 | 15 | mV | VIN = 2.8V, 1mA ≤ IOUT ≤ 300mA | 4 |
| Line Regulation | VRLINE |  | 1 | 15 | mV | 2.8V ≤ VIN ≤ 6V, IOUT = 30mA | 4 |
| Dropout Voltage | VDROP |  | 10 | 12 | mV | IOUT = 10mA | 4 |
| Dropout Voltage | VDROP |  | 100 | 120 | mV | IOUT = 100mA | 4 |
| Dropout Voltage | VDROP |  | 300 | 360 | mV | IOUT = 300mA | 4 |
| Quiescent Current | IQ |  | 60 | 90 | µA | VIN = 2.8V, IOUT = 0mA | 4 |
| Standby Current | ISTD |  | 0.01 | 1 | µA | VIN = 2.8V, VCE in OFF mode | 4 |
| CE High Voltage |  | 1.5 |  |  | V | CE input voltage "High" | 4 |
| CE Low Voltage |  |  |  | 0.4 | V | CE input voltage "Low" | 4 |
| Input Voltage (absolute maximum) | VIN |  |  | 6.5 | V |  | 3 |
| Enable Input Voltage | VCE | -0.3 |  |  | V | upper limit VIN +0.3 V | 3 |
| Output Current | IOUT |  |  | 450 | mA |  | 3 |
| Junction Temperature | TJ |  |  | 150 | ºC |  | 3 |
| Storage Temperature Range | TSTG | -65 |  | 150 | ºC |  | 3 |
| Lead Temperature | TLEAD |  |  | 260 | ºC | Soldering, 10sec | 3 |
| ESD (Human Body Model) | ESD |  |  | 6000 | V |  | 3 |
| ESD (Machine Model) | ESD |  |  | 400 | V |  | 3 |
| Input Voltage (recommended) | VIN |  |  | 6 | V | minimum is VOUT+0.5V | 3 |
| Operating Ambient Temperature Range | TA | -40 |  | 85 | ºC |  | 3 |
| Thermal Resistance | θJA |  | 300 |  | ºC/W | SC-70-5 | 3 |
| Power Supply Rejection Ratio | PSRR |  | 70 |  | dB | Ripple 0.5Vp-p, VIN = 2.8V, f = 100Hz | 4 |
| Output Voltage Temperature Coefficient | (∆VOUT/VOUT)/∆T |  | 100 |  | ppm/ºC | IOUT = 30mA; printed ±100 | 4 |
| Short Current Limit | ISHORT |  | 50 |  | mA | VOUT = 0V | 4 |
| RMS Output Noise | VNOISE |  | 50 |  | µVrms | 10Hz ≤ f ≤ 100kHz | 4 |
| Thermal Shutdown |  |  | 160 |  | ºC |  | 4 |
| Thermal Shutdown Hysteresis |  |  | 25 |  | ºC |  | 4 |

## CAD (KiCad official)

- Symbol: `AP2125KS-1.8TRG1`
- Footprint: `Package_TO_SOT_SMD:SOT-353_SC-70-5`
- 3D model: SC-70-5 (KiCad packages3D, STEP)
- 3D model files: `ap2125ks-1-8trg1-etched.step` / `ap2125ks-1-8trg1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ap2125ks-1-8trg1.step` / `ap2125ks-1-8trg1.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/AP2125KS-1.8TRG1.pdf) (25 pp, sha256 `73dd4f47f543db12`, retrieved 2026-11-02, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-opus-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/ap2125ks-1-8trg1-datasheet.pdf)