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TL431AIDBZRG4

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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 tl431aidbzrg4: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
viewers tl431aidbzrg4: viewers · Ray 1mo ago
package.json tl431aidbzrg4: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray 1mo ago
page.json tl431aidbzrg4: specified limits as data (metadata.characteristics, 19 rows from the datasheet) · Ray 26d ago
README.md tl431aidbzrg4: specified limits as data (metadata.characteristics, 19 rows from the datasheet) · Ray 26d ago
tl431aidbzrg4-etched.fit.json tl431aidbzrg4: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431aidbzrg4-etched.glb tl431aidbzrg4: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431aidbzrg4-etched.step tl431aidbzrg4: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431aidbzrg4.glb Publish 0.1.0 · Ray 1mo ago
tl431aidbzrg4.kicad_mod Publish 0.1.0 · Ray 1mo ago
tl431aidbzrg4.kicad_sym Publish 0.1.0 · Ray 1mo ago
tl431aidbzrg4.lbr Publish 0.1.0 · Ray 1mo ago
tl431aidbzrg4.step Publish 0.1.0 · Ray 1mo ago

TL431AIDBZRG4

Texas Instruments · Voltage Reference · SOT-23-3

TL431AIDBZRG4 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 REF input Reference input terminal; feedback voltage compared with internal 2.5 V reference to set output voltage or threshold level with bias current of 2-4 µA minimum.
2 CATHODE output Output terminal that sources or sinks regulated current from 1 mA to 100 mA maximum at output voltage adjustable from 2.5 V to 36 V.
3 ANODE power_in Ground return terminal serving as common reference point for all device currents and voltages; typically connected to circuit ground.

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 voltage (AI grade, 25°C) Vref 2470 2495 2520 mV VKA = Vref, IKA = 10mA 11
Reference voltage deviation over temperature (SOT-23-3 device) VI(dev) 14 34 mV VKA = Vref, IKA = 10mA; SOT23-3 device 11
Reference voltage change ratio to cathode voltage (10V to Vref) ΔVref/ΔVKA -1.4 -2.7 mV/V IKA = 10mA, ΔVKA = 10V - Vref 11
Reference voltage change ratio to cathode voltage (36V to 10V) ΔVref/ΔVKA -1 -2 mV/V IKA = 10mA, ΔVKA = 36V - 10V 11
Reference input current Iref 2 4 µA IKA = 10mA, R1 = 10kΩ, R2 = ∞ 11
Reference input current deviation over temperature II(dev) 0.8 2.5 µA IKA = 10mA, R1 = 10kΩ, R2 = ∞ 11
Minimum cathode current for regulation Imin 0.4 0.7 mA VKA = Vref 11
Off-state cathode current Ioff 0.1 0.5 µA VKA = 36V, Vref = 0 11
Dynamic impedance /ZKA/ 0.2 0.5 Ω VKA = Vref, f ≤ 1kHz, IKA = 1mA to 100mA 11
Cathode voltage VKA 36 V Printed minimum is Vref (not a number); maximum 36 V 6
Continuous cathode current IKA 1 100 mA 6
Operating free-air temperature (TL43xxI) TA -40 85 °C Natural ventilation, TL43xxI grade 6
Cathode voltage VKA 37 V Referenced to ANODE 6
Continuous cathode current range IKA -100 150 mA 6
Reference input current II(ref) -0.05 10 mA 6
Operating virtual junction temperature range TJ 150 °C 6
Storage temperature range Tstg -65 150 °C 6
Junction-to-ambient thermal resistance (DBZ package) RθJA 206 °C/W DBZ (SOT-23-3) column of thermal table 6
Junction-to-case (top) thermal resistance (DBZ package) RθJC(top) 76 °C/W DBZ (SOT-23-3) column of thermal table 6

CAD (KiCad official)

  • Symbol: TL431AIDBZRG4
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3 (KiCad packages3D, STEP)
  • 3D model files: tl431aidbzrg4-etched.step / tl431aidbzrg4-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431aidbzrg4.step / tl431aidbzrg4.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