AZ431AN-ATRE1 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	REF	input	Reference (feedback) input to the internal error amplifier. Regulation drives VKA so that VREF = 2.500V typical (0.4% initial tolerance for the AZ431A variant) with respect to ANODE. Reference input current 0.7µA typical, 4µA max; absolute maximum reference input current 10mA.
2	ANODE	power_in	Anode terminal - the low-side of the shunt regulator (analogous to a Zener anode / ground return). All internal circuitry is referenced to this pin.
3	CATHODE	power_in	Cathode terminal - the regulated (shunted) node. Sinks 1mA to 100mA over the operating range with cathode voltage from VREF to 36V (absolute max VKA = 40V, IKA = -100 to 150mA). Dynamic impedance ZKA = 0.15Ω typical at f ≤ 1kHz.

Key specifications

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

Ordering variants

AZ431AN-ATRE1
AZ431AN-ATRE1AR

CAD (KiCad official)

Symbol: AZ431AN-ATRE1
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
`az431an-atre1.step`	59 KB	You want the bare part, or you mark your own boards.
`az431an-atre1-etched.step`	1.6 MB	You want the part with `AZ431AN-ATRE1` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 425 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 (19 pp, sha256 af7f4848d81a3997, 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