AS431HMBNTR-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	CATHODE	passive	Shunt regulator cathode. Sinks 0.5 mA to 100 mA, absolute-max cathode voltage 40 V (recommended max 36 V). Dynamic impedance ~0.15 Ω typ. In the mirror pin-out (AS431HM...), pin 1 is CATHODE (vs. REF in the normal pin-out).
2	REF	input	Reference (feedback) input. Internally compared against the 2.495 V bandgap reference; tie via a resistor divider from cathode to set the regulated cathode voltage between VREF and 36 V. Reference input current ~0.7 µA typ (4 µA max), IREF absolute max 10 mA.
3	ANODE	passive	Shunt regulator anode (return / ground for the shunt current path). Cathode current returns through this pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

AS431HMBNTR-G1
AS431HMBNTR-G1MANTR-G1
AS431HMBNTR-G1ANTR-G1
AS431HMBNTR-G1AZTR-G1
AS431HMBNTR-G1BZTR-G1

CAD (KiCad official)

Symbol: AS431HMBNTR-G1
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 (None pp, sha256 53df2842f0c152f0, 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