AP431SBNTR-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. Compared internally against VREF (2.500 V typ, 2.495 V for AP431SH grade). Drives the internal error amplifier; typical bias current IREF ≈ 0.2 µA. Tie to the resistor-divider tap that programs VOUT.
2	CATHODE	passive	Cathode terminal of the shunt regulator. Sinks current (0.1 mA to 100 mA operating; up to 150 mA absolute max) to regulate VKA at the programmed voltage. Absolute max VKA = 40 V; operating VKA from VREF to 36 V.
3	ANODE	passive	Anode terminal / return of the shunt regulator. Normally tied to circuit ground (or the low side of the sinked-current path).

Key specifications

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

Ordering variants

AP431SBNTR-G1N
AP431SBNTR-G1
AP431SBNTR-G1N1

CAD (KiCad official)

Symbol: AP431SBNTR-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 (17 pp, sha256 770b9144c5e6fc10, 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