AZ431AZ-ATRE1 from Diodes Incorporated, in a TO-92-2.54mm. 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 input to the internal error amplifier. Regulation forces this pin to the internal 2.5 V VREF (0.4% tol) versus ANODE, typically driven from an external resistor divider between CATHODE and ANODE to program the output. Max continuous input current 10 mA; typical IREF ~0.7 uA.
2	CATHODE	passive	Shunt cathode (K). Sinks the regulation current to hold VKA at the programmed voltage set by the REF divider. Absolute max VKA = 40 V, recommended 2.5 V to 36 V; cathode current range -100 mA to +150 mA (recommended 1 mA to 100 mA for regulation). Dynamic impedance ~0.15 Ω typical.
3	ANODE	passive	Shunt anode (A), the common reference return for both the cathode current and the REF input divider. Typically tied to circuit ground in a shunt-regulator configuration.

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	TO-92-2.54mm
Category	PMIC
Pins	3

Ordering variants

AZ431AZ-ATRE1
AZ431AZ-ATRE1AZ431AR
AZ431AZ-ATRE1AZ431AN

CAD (KiCad official)

Symbol: AZ431AZ-ATRE1
Footprint: Package_TO_SOT_THT:TO-92_Inline
3D model: TO-92-2.54mm (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`az431az-atre1.step`	27 KB	You want the bare part, or you mark your own boards.
`az431az-atre1-etched.step`	1.4 MB	You want the part with `AZ431AZ-ATRE1` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 393 faces against 19 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