component
AP2125K-1.8TRG1
Public Made by Adomby adom
MSKSEMI Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownAP2125K-1.8TRG1
MSKSEMI · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5
AP2125K-1.8TRG1 from MSKSEMI, in a SOT-23-5. 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 | Power input pin; the datasheet's recommended input voltage range is 1.2V to 5.5V, with a 1uF or larger input capacitor placed close to the VIN and GND pins. |
| 2 | GND | power_in | Ground pin; input and output capacitor ground connections must return to this pin using short, wide traces. |
| 3 | EN | input | Enable control; EN falling below 0.4V puts the device in shutdown (typical shutdown current 0.1µA), and EN must be at or above 1.0V (rising threshold) to enable the output. |
| 4 | NC | unconnected | Floating pin with no internal connection, to be left unconnected. |
| 5 | VOUT | power_out | Regulated output; use a ceramic output capacitor of 1uF to 22uF (ESR above 1mΩ) placed close to the VOUT and GND pins, with output current limited to 600mA (typical). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | SOT-23-5 |
| 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 |
|---|---|---|---|---|---|---|---|
| Input voltage | VIN | 1.2 | 5.5 | V | 7 | ||
| Output voltage accuracy | -2 | 2 | % | ILOAD = 0.1mA | 7 | ||
| Output current limit | ILIM | 301 | 600 | mA | VOUT = 0V | 7 | |
| Shutdown current | ISD | 0.1 | 0.5 | μA | VEN = 0V, VOUT = 0V | 7 | |
| EN input current | IEN | 10 | 100 | nA | VEN = 5V | 7 | |
| Input voltage (recommended operating) | VIN | 1.2 | 5.5 | V | 6 | ||
| Application junction temperature range | -40 | 125 | °C | 6 | |||
| Application ambient temperature range | -40 | 85 | °C | 6 | |||
| VIN to GND | -0.3 | 7 | V | 6 | |||
| VOUT, EN to GND | -0.3 | 6 | V | 6 | |||
| VOUT to VIN | -6 | 0.3 | V | 6 | |||
| Soldering temperature | 260 | °C | 10 sec. | 6 | |||
| Junction temperature (absolute maximum) | 150 | °C | 6 | ||||
| Storage temperature range | -60 | 150 | °C | 6 | |||
| ESD HBM | 2 | KV | 6 | ||||
| ESD MM | 200 | V | 6 | ||||
| ESD CDM | 2 | KV | 6 |
CAD (KiCad official)
- Symbol:
AP2125K-1.8TRG1 - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files:
ap2125k-1-8trg1-etched.step/ap2125k-1-8trg1-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ap2125k-1-8trg1.step/ap2125k-1-8trg1.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MSKSEMI datasheet (14 pp, sha256
c28f07d50c0135a8, retrieved 2026-10-18, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).