AS431ANTR-E1 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 input to the internal error amplifier. Compared against the internal 2.500 V bandgap; when REF exceeds VREF the cathode sinks current. Input current IREF typically 0.7 uA (4 uA max); absolute maximum reference current 10 mA.
2	CATHODE	input	Cathode (K) of the shunt regulator. Sinks the regulated current from the load; operating cathode voltage 2.5 V to 36 V, cathode current 1 mA to 100 mA (absolute max -100 to 150 mA). Off-state cathode current 0.05 uA typ at VKA = 36 V.
3	ANODE	power_in	Anode (A) of the shunt regulator, common return for cathode current and reference. Connect to the low-side rail (ground in a typical shunt-reference circuit).

Key specifications

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

Ordering variants

AS431ANTR-E1
AS431ANTR-E1BNTR-E1
AS431ANTR-E1ANTR-G1
AS431ANTR-E1BNTR-G1
AS431ANTR-E1AKTR-E1
AS431ANTR-E1BKTR-E1
AS431ANTR-E1AKTR-G1
AS431ANTR-E1BKTR-G1
AS431ANTR-E1ARTR-E1
AS431ANTR-E1BRTR-E1
AS431ANTR-E1ARTR-G1
AS431ANTR-E1BRTR-G1
AS431ANTR-E1AZ-E1
AS431ANTR-E1AZTR-E1
AS431ANTR-E1BZ-E1
AS431ANTR-E1BZTR-E1
AS431ANTR-E1AZ-G1
AS431ANTR-E1AZTR-G1
AS431ANTR-E1BZ-G1
AS431ANTR-E1BZTR-G1

CAD (KiCad official)

Symbol: AS431ANTR-E1
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D, STEP)

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