TLV431AIDBZR from Texas Instruments, 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. Threshold relative to the common anode; the device regulates the cathode voltage so REF equals VREF (typ 1.24 V). Reference terminal current is typically 0.15 uA.
2	CATHODE	bidirectional	Shunt current/voltage input (K). Sinks the regulated shunt current; recommended cathode current 0.1 mA to 15 mA, absolute max +/-20 mA, max cathode voltage 7 V. Typical dynamic impedance 0.25 ohm.
3	ANODE	power_in	Common terminal (A), normally connected to ground. All voltages in the datasheet are referenced to this terminal.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOT-23
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

TLV431AIDBZR
TLV431AIDBZT
TLV431AIDBZRIDBVR
TLV431AIDBZRIDBVT
TLV431AIDBZRIDCKR
TLV431AIDBZRIDCKT
TLV431AIDBZRIDR
TLV431AIDBZRIPK
TLV431AIDBZRLP
TLV431AIDBZRLPR

CAD (KiCad official)

Symbol: TLV431AIDBZR
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
`tlv431aidbzr.step`	59 KB	You want the bare part, or you mark your own boards.
`tlv431aidbzr-etched.step`	1.6 MB	You want the part with `TLV431AIDBZR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 425 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: Texas Instruments datasheet (46 pp, sha256 4c8a6bd9d4c66c01, 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