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TL431AQPK

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Texas Instruments Voltage References, SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TL431AQPK

Texas Instruments · Voltage References · SOT-89-3

TL431AQPK from Texas Instruments, in a SOT-89-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 REF input Threshold reference input relative to the common anode; it cannot be left floating (IREF ≥ 4µA needed) and is regulated to about 2.5V (Vref), with input current abs max of 10mA.
2 ANODE power_in Common pin, normally connected to ground.
3 CATHODE bidirectional Shunt current/voltage input, operated from Vref to 36V (37V abs max) with 1mA to 100mA continuous cathode current.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOT-89-3
Category Power Management ICs
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 2470 2495 2520 mV VKA = Vref, IKA = 10mA 11
Deviation of reference input voltage over full temperature range VI(dev) 14 34 mV VKA = Vref, IKA = 10mA 11
Ratio of change in reference voltage to change in cathode voltage (VKA = 10V - Vref) ΔVref/ΔVKA -1.4 -2.7 mV/V IKA = 10mA, ΔVKA = 10V- Vref 11
Ratio of change in reference voltage to change in cathode voltage (VKA = 36V - 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
Deviation of reference input current over full temperature range 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 ≤ kHz, IKA = 1mA to 100mA 11
Cathode Voltage VKA 37 V with respect to ANODE 5
Continuous Cathode Current Range IKA -100 150 mA 5
Reference Input Current II(ref) -0.05 10 mA 5
Operating Junction Temperature Range TJ 150 °C 5
Storage Temperature Range Tstg -65 150 °C 5
Continuous Cathode Current Range IKA 1 100 mA 5
Operating Free-Air Temperature TA -40 125 °C TL43xxQ 5
Junction-to-ambient thermal resistance RθJA 52 °C/W PK package 5
Junction-to-case (top) thermal resistance RθJC(top) 9 °C/W PK package 5
ESD HBM V(ESD) -2000 2000 V Human body model (HBM), per ANSI/ESDA/JEDEC JS-001 5
ESD CDM V(ESD) -1000 1000 V Charged-device model (CDM), per JEDEC specification JESD22-C101 5

CAD (KiCad official)

  • Symbol: TL431AQPK
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: tl431aqpk-etched.step / tl431aqpk-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431aqpk.step / tl431aqpk.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (85 pp, sha256 ed2e90697de4e2c5, retrieved 2026-10-27, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (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