component
TL431G-AE3-R
Public Made by Adomby adom
UTC Unisonic Tech 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
markdownTL431G-AE3-R
UTC Unisonic Tech · Voltage Reference · SOT-23
TL431G-AE3-R from UTC Unisonic Tech, 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 | K | passive | Cathode terminal of the shunt regulator; cathode voltage must stay between VREF and 36 V (37 V absolute maximum), with cathode current of 1 to 100 mA recommended and -100 to +150 mA absolute maximum. |
| 2 | R | input | Reference input, nominally about 2.5 V (VREF), used with an external resistor divider to set the output voltage; reference input current is rated -0.05 to +10 mA absolute maximum. |
| 3 | A | passive | Anode terminal, the common return for the cathode current; the minimum cathode current for regulation is 0.3 to 0.5 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| 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 |
|---|---|---|---|---|---|---|---|
| Deviation of reference input voltage over temperature | ∆VREF | 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 | ∆VREF/∆VKA | -1 | -2.7 | mV/V | VKA=10V~VREF | 3 | |
| Ratio of change in reference input voltage to change in cathode voltage | ∆VREF/∆VKA | -0.5 | -2 | mV/V | VKA=36V~10V, IKA=10mA | 3 | |
| Reference input current | IREF | 1.5 | 4 | µA | IKA=10mA, R1=10kΩ, R2=∞ | 3 | |
| Deviation of reference input current over full temperature range | ∆IREF | 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) | VKA | 36 | V | 3 | |||
| Cathode current (recommended) | IKA | 1 | 100 | mA | 3 | ||
| Cathode voltage (absolute maximum) | 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 | 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-AE3-R - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
tl431g-ae3-r-etched.step/tl431g-ae3-r-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431g-ae3-r.step/tl431g-ae3-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 2026-10-18, 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).