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TL431S

Public Made by Adom

by adom

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

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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docs Publish 0.1.0 · Ray 22d ago
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package.json Publish 0.1.0 · Ray 22d ago
page.json tl431s: specified limits as data (metadata.characteristics, 14 rows from the datasheet) · Ray 16d ago
README.md tl431s: specified limits as data (metadata.characteristics, 14 rows from the datasheet) · Ray 16d ago
tl431s-etched.glb tl431s: factory component page (tier=lcsc) · Ray 22d ago
tl431s-etched.step tl431s: factory component page (tier=lcsc) · Ray 22d ago
tl431s-hero.glb tl431s: hero GLB from the etched model (keeps the MPN mark) · Ray 22d ago
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TL431S

UMW · Voltage Reference · SOT-89-3

TL431S from UMW, 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 Reference input that sets the output voltage via an external resistor divider; reference input current range is 0.05 to 10 mA (absolute maximum).
2 ANODE power_in Anode terminal, connected to ground in typical shunt regulator circuits.
3 CATHODE passive Cathode terminal that sinks 0.5 mA to 100 mA recommended and up to 36 V recommended (40 V absolute maximum VKA).

Key specifications

Parameter Value
Manufacturer UMW
Package SOT-89-3
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
Cathode Voltage VKA 40 V 2
Cathode Current Range (Continuous) IK -100 150 mA 2
Reference Input Current Range IREF 0.05 10 mA 2
Operating Temperature Range Toper. -40 85 °C 2
Junction Temperature Range TJ 150 °C 2
Storage Temperature Range TSTG -65 150 °C 2
Cathode Voltage VKA 36 V 2
Cathode Current IK 0.5 100 mA 2
Reference Input Voltage (0.5% grade) VREF 2.483 2.495 2.508 V TA=25°C, VKA=VREF, IK=10mA 3
Deviation of Reference Input Voltage Over Full Temperature Range VREF(dev) 3 17 mV Tmin≤Ta≤Tmax 3
Reference Input Current IREF 2 4 µA R1=10KΩ, R2=∞ 3
Deviation of Reference Input Current Over Full Temperature Range IREF(dev) 0.4 1.2 µA Tmin≤Ta≤Tmax, R1=10KΩ, R2=∞ 3
Dynamic Impedance ZKA 0.27 Ω IK=1mA to 100mA, f≤1.0KHz 3
Thermal Resistance From Junction to Ambient in Free Air (SOT-89) θJA 400 °C/W Free air, component mounted on high effective thermal conductivity test board 2

CAD (KiCad official)

  • Symbol: TL431S
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: tl431s-etched.step / tl431s-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431s.step / tl431s.glb are the bare package body.

Provenance

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

  • Datasheet: UMW datasheet (11 pp, sha256 7c8052c62fb0f6ba, retrieved 2026-10-09, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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