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TL431CDBZR

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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 tl431cdbzr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
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package.json tl431cdbzr: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray 1mo ago
page.json tl431cdbzr: specified limits as data (metadata.characteristics, 19 rows from the datasheet) · Ray 25d ago
README.md tl431cdbzr: specified limits as data (metadata.characteristics, 19 rows from the datasheet) · Ray 25d ago
tl431cdbzr-etched.fit.json tl431cdbzr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431cdbzr-etched.glb tl431cdbzr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431cdbzr-etched.step tl431cdbzr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431cdbzr.glb Publish 0.1.0 · Ray 1mo ago
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TL431CDBZR

Texas Instruments · Voltage Reference · SOT-23-3

TL431CDBZR 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 node (I/O): cathode voltage VKA is recommended to range from Vref to 36V with continuous cathode current IKA of 1mA to 100mA (absolute maximum VKA=37V, IKA=-100mA to 150mA); minimum regulated cathode current Imin is 0.4-1mA depending on grade.
2 REF input Reference input (I) that sets the threshold voltage relative to the common ANODE; the internal 2.5V (nominal 2440-2550mV depending on grade) reference requires a reference input current Iref of typically 2µA (max 4µA) and must not be left floating since absolute maximum reference input current range is -0.05mA to 10mA.
3 ANODE output Common pin (O) of the device, typically connected to circuit ground, providing the return path for the cathode and reference currents.

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 Vref 2440 2495 2550 mV VKA = Vref，IKA = 10mA 7
Reference voltage deviation over temperature range (SOT23-3) VI(dev) 6 16 mV VKA = Vref，IKA = 10mA 7
Ratio of reference voltage change to cathode voltage change ΔVref/ΔVKA -1.4 -2.7 mV/V IKA = 10mA，ΔVKA = 10V - Vref 7
Ratio of reference voltage change to cathode voltage change ΔVref/ΔVKA -1 -2 mV/V IKA = 10mA，ΔVKA = 36V - 10V 7
Reference input current Iref 2 4 µA IKA = 10mA，R1 = 10kΩ，R2 = ∞ 7
Reference input current deviation over temperature range II(dev) 0.4 1.2 µA IKA = 10mA，R1 = 10kΩ，R2 = ∞ 7
Minimum cathode current for regulation Imin 0.4 1 mA VKA = Vref 7
Off-state cathode current Ioff 0.1 1 µA VKA = 36V，Vref = 0 7
Dynamic impedance /ZKA/ 0.2 0.5 Ω VKA = Vref，f ≤ 1kHz，IKA = 1mA 至 100mA 7
Cathode voltage VKA 36 V Minimum printed as Vref (not a number) 6
Continuous cathode current range IKA 1 100 mA 6
Operating free-air temperature range (TL43xxC) TA 0 70 °C TL43xxC, free-air 6
Cathode voltage VKA 37 V 6
Continuous cathode current range IKA -100 150 mA 6
Reference input current II(ref) -0.05 10 mA 6
Operating junction temperature range TJ 150 °C 6
Storage temperature range Tstg -65 150 °C 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: TL431CDBZR
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3 (KiCad packages3D, STEP)
  • 3D model files: tl431cdbzr-etched.step / tl431cdbzr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431cdbzr.step / tl431cdbzr.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