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AP2125K-2.8TRG1

Public Made by Adom

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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.

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Ray ap2125k-2-8trg1: factory component page (tier=lcsc) 0cfab66 18d ago

AP2125K-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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ap2125k-2-8trg1.step / ap2125k-2-8trg1.glb are 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, 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