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TL431ACDBZT

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Texas Instruments Voltage Reference, SOT-23-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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docs tl431acdbzt: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
viewers tl431acdbzt: viewers · Ray 1mo ago
package.json tl431acdbzt: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray 1mo ago
page.json tl431acdbzt: specified limits as data (metadata.characteristics, 18 rows from the datasheet) · Ray 26d ago
README.md tl431acdbzt: specified limits as data (metadata.characteristics, 18 rows from the datasheet) · Ray 26d ago
tl431acdbzt-etched.fit.json tl431acdbzt: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431acdbzt-etched.glb tl431acdbzt: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431acdbzt-etched.step tl431acdbzt: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431acdbzt.glb Publish 0.1.0 · Ray 1mo ago
tl431acdbzt.kicad_mod Publish 0.1.0 · Ray 1mo ago
tl431acdbzt.kicad_sym Publish 0.1.0 · Ray 1mo ago
tl431acdbzt.lbr Publish 0.1.0 · Ray 1mo ago
tl431acdbzt.step Publish 0.1.0 · Ray 1mo ago

TL431ACDBZT

Texas Instruments · Voltage Reference · SOT-23-3

TL431ACDBZT 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 bidirectional Shunt regulator current/voltage terminal (I/O); in regulation must be supplied with a cathode current of 1 mA to 100 mA (Imin to max recommended IKA), with cathode voltage up to 36 V (absolute maximum 37 V, current range -100 mA to 150 mA).
2 REF input Reference/threshold input relative to the common ANODE pin; internal amplifier compares this pin to the ~2.5 V internal reference and requires a reference input current (typ. 2 µA, max 4-10 µA) to bias the input transistor.
3 ANODE passive Common pin of the device, normally connected to ground/return; serves as the reference (0 V) node for the CATHODE and REF pin voltages.

Key specifications

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

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Reference input voltage deviation over temperature range (SOT23-3) VI(dev) 6 16 mV VKA = Vref, IKA = 10mA 10
Reference voltage change vs cathode voltage (ΔVKA = 10V - Vref) ΔVref/ΔVKA -1.4 -2.7 mV/V IKA = 10mA; ΔVKA = 10V - Vref 10
Reference voltage change vs cathode voltage (ΔVKA = 36V - 10V) ΔVref/ΔVKA -1 -2 mV/V IKA = 10mA; ΔVKA = 36V - 10V 10
Reference input current Iref 2 4 µA IKA = 10mA, R1 = 10kΩ, R2 = ∞ 10
Reference input current deviation over temperature range II(dev) 0.8 1.2 µA IKA = 10mA, R1 = 10kΩ, R2 = ∞ 10
Minimum cathode current for regulation Imin 0.4 0.6 mA VKA = Vref 10
Off-state cathode current Ioff 0.1 0.5 µA VKA = 36V, Vref = 0 10
Dynamic impedance /ZKA/ 0.2 0.5 Ω VKA = Vref, f ≤ 1kHz, IKA = 1mA to 100mA 10
Cathode voltage (absolute maximum) VKA 37 V Referenced to ANODE 6
Continuous cathode current range (absolute maximum) IKA -100 150 mA 6
Reference input current (absolute maximum) II(ref) -0.05 10 mA 6
Operating junction temperature range (absolute maximum) TJ 150 °C 6
Storage temperature range Tstg -65 150 °C 6
Cathode voltage (recommended) VKA 36 V Minimum given as Vref 6
Continuous cathode current range (recommended) IKA 1 100 mA 6
Operating free-air temperature range (TL43xxC, grade C) TA 0 70 °C Natural ventilation 6
Junction-to-ambient thermal resistance (DBZ, SOT-23-3) RθJA 206 °C/W 6
Junction-to-case (top) thermal resistance (DBZ, SOT-23-3) RθJC(top) 76 °C/W 6

CAD (KiCad official)

  • Symbol: TL431ACDBZT
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3 (KiCad packages3D, STEP)
  • 3D model files: tl431acdbzt-etched.step / tl431acdbzt-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431acdbzt.step / tl431acdbzt.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (86 pp, sha256 313277b9351e61ed, retrieved 2026-09-23, 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: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF