AN431AN-ATRG1 from Diodes Incorporated, 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	CATHODE	input	Cathode (K). Current-sink terminal of the shunt regulator; regulates VKA (VREF≤VKA≤36 V) by sinking 1-100 mA (100 mA continuous max, ±150 mA absolute max). Off-state leakage ≤1 µA at VKA=36 V.
2	REF	input	Reference input. High-impedance sense pin compared internally against the 2.500 V bandgap reference; drive from an external divider between CATHODE and ANODE to program VKA=VREF·(1+R1/R2). Reference input current ≤4 µA typ, absolute max IREF=10 mA.
3	ANODE	power_in	Anode (A). Return terminal of the shunt regulator; typically tied to circuit ground. Sinks the combined cathode plus reference-input current.

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	SOT-23
Category	PMIC
Pins	3

Ordering variants

AN431AN-ATRG1

CAD (KiCad official)

Symbol: AN431AN-ATRG1
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
`an431an-atrg1.step`	59 KB	You want the bare part, or you mark your own boards.
`an431an-atrg1-etched.step`	1.7 MB	You want the part with `AN431AN-ATRG1` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 445 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: Diodes Incorporated datasheet (13 pp, sha256 abb5965f39adbd33, retrieved 2026-08-17, tier: manufacturer)
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