component
AP2125K-2.8TRG1
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-2.8TRG1
MSKSEMI · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5
AP2125K-2.8TRG1 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 | Input supply pin, rated for 1.2V to 5.5V, with a 1µF 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 through short, wide traces. |
| 3 | EN | input | Enable control; pulling EN low puts the device into shutdown mode, with EN rising threshold VIH of 1.0V and falling threshold VIL of 0.4V. |
| 4 | NC | unconnected | No-connect pin, listed as a floating pin in the datasheet. |
| 5 | VOUT | power_out | Regulated output pin; the output capacitor (1µF to 22µF effective, ESR above 1mΩ) should be placed close to VOUT and GND. |
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 |
|---|---|---|---|---|---|---|---|
| Output voltage accuracy | -2 | 2 | % | ILOAD = 0.1mA | 7 | ||
| Input voltage | VIN | 1.2 | 5.5 | V | 7 | ||
| Shutdown current | ISD | 0.1 | 0.5 | μA | VEN = 0V, VOUT = 0V | 7 | |
| EN input current | IEN | 10 | 100 | nA | VEN = 5V | 7 | |
| Absolute maximum VIN to GND | VIN | -0.3 | 7 | V | Note 1 applies | 6 | |
| Absolute maximum VOUT, EN to GND | VOUT, EN | -0.3 | 6 | V | to GND | 6 | |
| Absolute maximum VOUT to VIN | VOUT-VIN | -6 | 0.3 | V | 6 | ||
| Absolute maximum junction temperature | TJ | 150 | oC | 6 | |||
| Absolute maximum storage temperature | TSTG | -60 | 150 | oC | 6 | ||
| Soldering temperature | 260 | oC | 10 sec soldering | 6 | |||
| ESD HBM | 2 | KV | HBM | 6 | |||
| ESD MM | 200 | V | MM | 6 | |||
| ESD CDM | 2 | KV | CDM | 6 | |||
| Applied junction temperature range | TJ | -40 | 125 | oC | 6 | ||
| Applied ambient temperature range | TA | -40 | 85 | oC | 6 | ||
| Thermal resistance junction to ambient | θJA | 200 | oC/W | TA = 25°C, EVB board (Note 2) | 6 |
CAD (KiCad official)
- Symbol:
AP2125K-2.8TRG1 - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files:
ap2125k-2-8trg1-etched.step/ap2125k-2-8trg1-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ap2125k-2-8trg1.step/ap2125k-2-8trg1.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MSKSEMI datasheet (14 pp, sha256
c28f07d50c0135a8, retrieved 2026-10-17, 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).