TLV431AFTA 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 to the 1.24 V bandgap reference; drives the internal error amplifier that regulates cathode current so that V(REF) equals VREF. Typical input current 0.15 uA (0.5 uA max); absolute maximum input current range -0.05 to +3 mA.
2	CATHODE	power_in	Cathode (K). Regulated shunt terminal; sinks current from the load/bias resistor to maintain V(REF) = 1.24 V. Recommended operating cathode voltage VREF to 18 V; cathode current 0.1 mA to 15 mA (absolute max +/-20 mA, VKA max 20 V). Minimum cathode current for regulation IKMIN ~ 55 uA typ.
3	ANODE	power_in	Anode (A). Common return terminal; all datasheet voltages are referenced to ANODE. Normally tied to the low-voltage rail (GND) of the regulated network.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

TLV431AFTA
TLV431AFTAE5
TLV431AFTAH6

CAD (KiCad official)

Symbol: TLV431AFTA
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
`tlv431afta.step`	59 KB	You want the bare part, or you mark your own boards.
`tlv431afta-etched.step`	1.2 MB	You want the part with `TLV431AFTA` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 319 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 (17 pp, sha256 bfc6983112ce20da, 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