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TL431AIM3

Public Made by Adom

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

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TL431AIM3

HGSEMI · Voltage Reference · SOT-23

TL431AIM3 from HGSEMI, in a SOT-23. 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 CATHODE bidirectional Shunt current/voltage input; the datasheet recommends a cathode current of 1 mA to 100 mA and a cathode voltage from Vref to 36 V (absolute maximum cathode voltage 37 V).
2 REF input Threshold (reference) input relative to the common anode, regulated to about 2.495 V; it must not float and needs IREF of at least 4 µA, with a reference input current absolute range of -0.05 mA to 10 mA.
3 ANODE power_in Common anode pin, normally connected to ground, and the reference point for the REF threshold.

Key specifications

Parameter Value
Manufacturer HGSEMI
Package SOT-23
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 2470 2495 2520 mV VKA = Vref, IKA = 10 mA 9
Deviation of reference input voltage over full temperature range (SOT-23 device) VI(dev) 14 34 mV VKA = Vref, IKA = 10 mA 9
Ratio of change in reference voltage to change in cathode voltage (VKA 10 V to Vref) ΔVref/ΔVKA -1.4 -2.7 mV/V IKA = 10 mA, ΔVKA = 10 V, Vref 9
Ratio of change in reference voltage to change in cathode voltage (VKA 10 V to 36 V) ΔVref/ΔVKA -1 -2 mV/V IKA = 10 mA, ΔVKA = 36 V, 10 V 9
Reference input current Iref 2 4 µA IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ 9
Deviation of reference input current over full temperature range II(dev) 0.8 2.5 µA IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ 9
Minimum cathode current for regulation Imin 0.4 0.7 mA VKA = Vref 9
Off-state cathode current Ioff 0.1 0.5 µA VKA = 36 V, Vref = 0 9
Dynamic impedance /zKA/ 0.2 0.5 Ω VKA = Vref, f ≤ 1 kHz, IKA = 1 mA to 100 mA 9
Cathode voltage (recommended) VKA 36 V 5
Cathode current (recommended) IKA 1 100 mA 5
Operating free-air temperature (TL431I/TL432I) TA -40 85 °C TL43xxI 5
Cathode voltage (absolute maximum) VKA 37 V 5
Continuous cathode current range IKA -100 150 mA 5
Reference input current range II(ref) -0.05 10 mA 5
Operating virtual junction temperature TJ 150 °C 5
Storage temperature range Tstg -65 150 °C 5
Lead temperature (soldering) TL 245 °C Soldering, 10 seconds 5
Electrostatic discharge, human-body model V(ESD) -2000 2000 V HBM, per ANSI/ESDA/JEDEC JS-001 5
Electrostatic discharge, charged-device model V(ESD) -1000 1000 V CDM, per JEDEC JESD22-C101 5

CAD (KiCad official)

  • Symbol: TL431AIM3
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: tl431aim3-etched.step / tl431aim3-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431aim3.step / tl431aim3.glb are the bare package body.

Provenance

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

  • Datasheet: HGSEMI datasheet (28 pp, sha256 813a3480f783af2b, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-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