component
TL431AIM3
Public Made by Adomby adom
HGSEMI Voltage Reference, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownTL431AIM3
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431aim3.step/tl431aim3.glbare 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, primaryclaude-haiku-5-5(text), consensusclaude-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).