component
TL431U
Public Made by Adomby adom
CBI Voltage References, SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
| Name | Last updated |
|---|---|
| docs | 2d ago |
| viewers | 2d ago |
| package.json | 2d ago |
| page.json | 2d ago |
| README.md | 2d ago |
| tl431u-etched.glb | 2d ago |
| tl431u-etched.step | 2d ago |
| tl431u-hero.glb | 2d ago |
| tl431u-hero.overlay.json | 2d ago |
| tl431u.glb | 2d ago |
| tl431u.kicad_mod | 2d ago |
| tl431u.kicad_sym | 2d ago |
| tl431u.lbr | 2d ago |
| tl431u.step | 2d ago |
TL431U
CBI · Voltage References · SOT-89-3
TL431U from CBI, 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 | REFERENCE | input | Reference input that the internal amplifier regulates to Vref of 2.5 V (2.475-2.525 V at IKA = 10 mA), with reference input current of 1.5 µA typ and 4 µA max. |
| 2 | ANODE | passive | Anode terminal, the return path for the cathode current; minimum cathode current for regulation is 0.45 mA typ and 1.0 mA max. |
| 3 | CATHODE | passive | Cathode terminal, rated for a cathode voltage of 37 V maximum and a continuous cathode current range of -100 to +150 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| Package | SOT-89-3 |
| Category | Power Management ICs |
| 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 | 37 | V | 1 | |||
| Cathode Current Range (Continuous) | IKA | -100 | 150 | mA | 1 | ||
| Reference Input Current Range | Iref | 0.05 | 10 | mA | 1 | ||
| Power Dissipation | PD | 500 | mW | 1 | |||
| Operating Ambient Temperature Range | Topr | -25 | 85 | ℃ | Operating temperature range applies unless otherwise specified | 1 | |
| Storage Temperature Range | Tstg | -65 | 150 | ℃ | 1 | ||
| Reference input voltage | Vref | 2.475 | 2.5 | 2.525 | V | VKA=VREF, IKA=10mA; Ta=25℃ | 1 |
| Deviation of reference input voltage over temperature (note) | △Vref /T | 4.5 | 17 | mV | △VKA=VREF, IKA=10mA; TMIN≤Ta≤TMAX | 1 | |
| Ratio of change in reference input voltage to change in cathode voltage (10V to VREF) | △Vref /△VKA | -1 | -2.7 | mV/V | △VKA=10V~VREF | 1 | |
| Ratio of change in reference input voltage to change in cathode voltage (36V to 10V) | △Vref /△VKA | -0.5 | -2 | mV/V | IKA=10mA; △VKA=36V~10V | 1 | |
| Reference input current | Iref | 1.5 | 4 | μA | IKA=10mA, R1=10kΩ, R2=∞ | 1 | |
| Deviation of reference input current over full temperature range | △Iref /T | 0.4 | 1.2 | μA | IKA=10mA, R1=10kΩ, R2=∞ | 1 | |
| Minimum cathode current for regulation | IKA(min) | 0.45 | 1 | mA | VKA=VREF | 1 | |
| Off-state cathode current | IKA(OFF) | 0.05 | 1 | μA | VKA=36V, VREF=0 | 1 | |
| Dynamic impedance | ZKA | 0.15 | 0.5 | Ω | VKA=VREF, IKA=1 to 100mA, f≤1.0kHz | 1 | |
| Operating Junction Temperature | Tj | 150 | ℃ | 1 | |||
| Thermal Resistance from Junction to Ambient | RθJA | 250 | ℃/W | 1 |
CAD (KiCad official)
- Symbol:
TL431U - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files:
tl431u-etched.step/tl431u-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431u.step/tl431u.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: CBI datasheet (4 pp, sha256
ad1604d4033d3f79, retrieved 2026-11-05, 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).