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TL431G-AE2-R
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UTC Unisonic Tech Voltage Reference, SOT-23-3. 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
markdownTL431G-AE2-R
UTC Unisonic Tech · Voltage Reference · SOT-23-3
TL431G-AE2-R from UTC Unisonic Tech, 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 | K | output | Cathode output terminal; operates from VREF (approx. 2.5V) to 36V with cathode current range −100 to +150 mA continuous and dynamic impedance 0.15 to 0.5 Ω at 1-100 mA. |
| 2 | R | input | Reference input terminal with voltage approximately 2.5V and input current range −0.05 to +10 mA. |
| 3 | A | power_in | Anode terminal; ground/negative supply return and regulator reference point. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| 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 Input Voltage (TL431-A grade row) | VREF | 2.483 | 2.495 | 2.507 | V | VKA=VREF, IKA=10mA | 3 |
| Reference Input Voltage (TL431-1 grade row) | VREF | 2.47 | 2.495 | 2.52 | V | VKA=VREF, IKA=10mA | 3 |
| Reference Input Voltage (TL431-2 grade row) | VREF | 2.52 | 2.545 | V | VKA=VREF, IKA=10mA | 3 | |
| Reference Input Voltage (TL431-3 grade row) | VREF | 2.445 | 2.47 | V | VKA=VREF, IKA=10mA | 3 | |
| Deviation of Reference Input Voltage Over Temperature | ΔVREF | 4.5 | 17 | mV | VKA=VREF, IKA=10mA, 0°C ≤ TA ≤ 70°C | 3 | |
| Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (VKA=10V~VREF) | ΔVREF/ΔVKA | -1 | -2.7 | mV/V | VKA=10V~VREF | 3 | |
| Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (VKA=36V~10V) | ΔVREF/ΔVKA | -0.5 | -2 | mV/V | IKA=10mA, VKA=36V~10V | 3 | |
| Reference Input Current | IREF | 1.5 | 4 | µA | IKA=10mA, R1=10kΩ, R2=∞ | 3 | |
| Deviation of Reference Input Current Over Full Temperature Range | ΔIREF | 0.4 | 1.2 | µA | IKA=10mA, R1=10kΩ, R2=∞, TA=full temperature | 3 | |
| Minimum Cathode Current for Regulation | IKA(MIN) | 0.3 | 0.5 | mA | VKA=VREF | 3 | |
| Off-State Cathode Current | IKA(OFF) | 0.05 | 1 | µA | VKA=36V, VREF=0 | 3 | |
| Dynamic Impedance | ZKA | 0.15 | 0.5 | Ω | VKA=VREF, IKA=1~100mA, f≤1.0kHz | 3 | |
| Cathode Voltage (recommended operating) | VKA | 36 | V | Minimum given as VREF (not a numeric value) | 3 | ||
| Cathode Current (recommended operating) | IKA | 1 | 100 | mA | 3 | ||
| Cathode Voltage | VKA | 37 | V | 3 | |||
| Cathode Current Range (Continuous) | IKA | -100 | 150 | mA | 3 | ||
| Reference Input Current Range | IREF | -0.05 | 10 | mA | 3 | ||
| Power Dissipation (SOT-23/SOT-23-3 package) | PD | 300 | mW | SOT-23/SOT-23-3 package | 3 | ||
| Operating Junction Temperature | TJ | 150 | °C | 3 | |||
| Operating Ambient Temperature | TOPR | -40 | 85 | °C | 3 | ||
| Storage Temperature | TSTG | -65 | 150 | °C | 3 |
CAD (KiCad official)
- Symbol:
TL431G-AE2-R - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files:
tl431g-ae2-r-etched.step/tl431g-ae2-r-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431g-ae2-r.step/tl431g-ae2-r.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UTC Unisonic Tech datasheet (6 pp, sha256
cbc7e42ea3607271, retrieved 2026-09-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).