AS431ANTR-G1 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. Internal op-amp compares this pin against the 2.500V bandgap reference and drives the internal shunt transistor. Typical reference input current IREF = 0.7µA (max 4µA). Absolute maximum input current 10mA.
2	CATHODE	passive	Cathode (K) of the shunt regulator. Sinks the regulation current when VREF pin reaches 2.500V. Operating cathode voltage range VREF to 36V, cathode current IKA 1mA to 100mA; absolute max VKA = 40V and IKA = 150mA. Off-state leakage 0.05µA typ at VKA = 36V.
3	ANODE	passive	Anode (A) of the shunt regulator. Common return terminal for the internal reference, op-amp and shunt transistor; typically connected to circuit ground in shunt-regulator use.

Key specifications

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

Ordering variants

AS431ANTR-G1
AS431ANTR-G1BNTR-G1
AS431ANTR-G1ANTR-E1
AS431ANTR-G1BNTR-E1
AS431ANTR-G1AKTR-G1
AS431ANTR-G1BKTR-G1
AS431ANTR-G1AKTR-E1
AS431ANTR-G1BKTR-E1
AS431ANTR-G1ARTR-G1
AS431ANTR-G1BRTR-G1
AS431ANTR-G1ARTR-E1
AS431ANTR-G1BRTR-E1
AS431ANTR-G1AZ-G1
AS431ANTR-G1AZTR-G1
AS431ANTR-G1BZ-G1
AS431ANTR-G1BZTR-G1
AS431ANTR-G1AZ-E1
AS431ANTR-G1AZTR-E1
AS431ANTR-G1BZ-E1
AS431ANTR-G1BZTR-E1

CAD (KiCad official)

Symbol: AS431ANTR-G1
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
`as431antr-g1.step`	59 KB	You want the bare part, or you mark your own boards.
`as431antr-g1-etched.step`	1.8 MB	You want the part with `AS431ANTR-G1` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 457 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 (20 pp, sha256 03f54aac77941ed9, 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