component

TL431AQDBZT

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by Ray

Texas Instruments Voltage Reference, SOT-23-3. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentpower management (pmic)tl431aqdbzt
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Symbol & Footprint

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Datasheet

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Contents

README

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TL431AQDBZT

Texas Instruments · Voltage Reference · SOT-23-3

TL431AQDBZT from Texas Instruments, in a SOT-23-3. 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 (K). Sinks 1-100 mA of cathode current when REF exceeds Vref (~2.5 V) - absolute-max continuous IKA = -100 to +150 mA, VKA(max) = 37 V, VKA(recommended) = Vref to 36 V. Output dynamic impedance is typ 0.2 Ω.
2 REF input Reference (feedback) input, threshold relative to ANODE. Internal comparator drives the shunt on when V(REF) ≥ Vref (nominal 2.5 V). Reference input current range -0.05 mA to +10 mA (absolute max); tie to divider tap between CATHODE and ANODE to program the regulated voltage.
3 ANODE power_in Common anode / return terminal - the reference point for VKA and Vref. Tie to system ground in the standard shunt-regulator topology.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOT-23-3
Category Power Management (PMIC)
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • TL431AQDBZT
  • TL431AQDBZTDBZR
  • TL431AQDBZTDBVT
  • TL431AQDBZTDBVR
  • TL431AQDBZTPK
  • TL431AQDBZTD
  • TL431AQDBZTP
  • TL431AQDBZTPS
  • TL431AQDBZTPW

CAD (KiCad official)

  • Symbol: TL431AQDBZT
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (None pp, sha256 0eb18c491f5517a3, retrieved 2026-08-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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