AS431BNTR-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 to the internal error amplifier. Regulates the cathode current so this pin sits at VREF = 2.500 V above ANODE. Typical input bias current IREF = 0.7 uA (max 4 uA); absolute-max reference input current 10 mA.
2	CATHODE	power_in	Cathode of the internal shunt element. Sinks 1 mA to 100 mA in normal regulation; absolute-max cathode voltage 40 V, recommended operating range VREF (2.5 V) to 36 V. Off-state leakage 0.05 uA typ at VKA = 36 V. Dynamic impedance 0.15 Ω typ.
3	ANODE	power_in	Anode / common return of the shunt regulator. Reference is measured with respect to this pin; usually tied to circuit ground in shunt-regulator configurations.

Key specifications

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

Ordering variants

AS431BNTR-G1ANTR-E1
AS431BNTR-G1BNTR-E1
AS431BNTR-G1ANTR-G1
AS431BNTR-G1
AS431BNTR-G1AKTR-E1
AS431BNTR-G1BKTR-E1
AS431BNTR-G1AKTR-G1
AS431BNTR-G1BKTR-G1
AS431BNTR-G1ARTR-E1
AS431BNTR-G1BRTR-E1
AS431BNTR-G1ARTR-G1
AS431BNTR-G1BRTR-G1
AS431BNTR-G1AZ-E1
AS431BNTR-G1AZTR-E1
AS431BNTR-G1BZ-E1
AS431BNTR-G1BZTR-E1
AS431BNTR-G1AZ-G1
AS431BNTR-G1AZTR-G1
AS431BNTR-G1BZ-G1
AS431BNTR-G1BZTR-G1

CAD (KiCad official)

Symbol: AS431BNTR-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
`as431bntr-g1.step`	59 KB	You want the bare part, or you mark your own boards.
`as431bntr-g1-etched.step`	1.9 MB	You want the part with `AS431BNTR-G1` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 486 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: 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