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CJ431D-N3A-ARG

Public Unreviewed

by Ray

Changjing Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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CJ431D-N3A-ARG

Changjing · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23

CJ431D-N3A-ARG from Changjing, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 R input Reference input pin. Compared internally to the 2.500 V bandgap reference; drive from the external divider between Cathode and Anode to program VKA. IREF is typically 0.7 uA (max 4 uA).
2 K power_in Cathode. Shunt current input / regulated output node. Sinks 1 mA to 100 mA of cathode current (IKA), absolute max VKA = 40 V, recommended max VKA = 36 V. Dynamic impedance ZKA typ 0.15 Ω.
3 A power_in Anode pin, normally grounded. All device voltages are referenced to the anode terminal.

Key specifications

Parameter Value
Manufacturer Changjing
Package SOT-23
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • CJ431D-N3A-ARG
  • CJ431D-N3A-BRG
  • CJ431D-N3A-ARGP3A-ARG
  • CJ431D-N3A-ARGP3A-BRG
  • CJ431D-N3A-ARGTAA-AAG
  • CJ431D-N3A-ARGTAA-ABG
  • CJ431D-N3A-ARGTAA-BAG
  • CJ431D-N3A-ARGTAA-BBG
  • CJ431D-N3A-ARGN3B-ARG
  • CJ431D-N3A-ARGN3B-BRG

CAD (KiCad official)

  • Symbol: CJ431D-N3A-ARG
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
cj431d-n3a-arg.step 59 KB You want the bare part, or you mark your own boards.
cj431d-n3a-arg-etched.step 2.0 MB You want the part with CJ431D-N3A-ARG already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 509 faces against 69 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

  • Datasheet: Changjing datasheet (24 pp, sha256 b75990ca44bd0e7d, retrieved 2026-08-17, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF