component
TL431S
Public Made by Adomby adom
UMW Voltage Reference, SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownTL431S
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431s.step/tl431s.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).