component
TL431-1%
Public Made by Adomby adom
FOSAN 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
markdownTL431-1%
FOSAN · Voltage Reference · SOT-23
TL431-1% from FOSAN, 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 | REF | input | Reference input (R) of the adjustable shunt regulator; reference voltage 2.495V typ at VKA=VREF, IKA=10mA, input current IREF within -0.05 to +10mA absolute maximum. |
| 2 | K | passive | Cathode (K) of the shunt regulator; VKA up to 40V absolute maximum, cathode current -100 to +150mA, sink capability 1 to 100mA, programmable output to 36V. |
| 3 | A | passive | Anode (A), the regulator's ground-return terminal, normally connected to the lowest circuit potential. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | FOSAN |
| 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 Input Voltage (1% grade) | VREF | 2.47 | 2.495 | 2.52 | V | VKA=VREF, IKA=10mA, Ta=25℃ | 2 |
| Deviation of Reference Input Voltage over temperature | ΔVREF/ΔT | 3 | 17 | mV | VKA=VREF, IKA=10mA, -20 to +85℃ | 2 | |
| Ratio of change in reference input voltage to cathode voltage | ΔVREF/ΔVKA | 2 | 2.7 | mV/V | IKA=10mA, VKA=10V to 36V | 2 | |
| Deviation of Reference Input Current over full temperature range | ΔIREF/ΔT | 0.4 | 1.2 | µA | IKA=10mA, R1=10kΩ, R2=∞, Ta=-20 to +85℃ | 2 | |
| Minimum cathode current for regulation | IKA(MIN) | 0.25 | 0.5 | mA | VKA=VREF | 2 | |
| Cathode to anode voltage | VKA | 40 | V | 1 | |||
| Cathode current range | IK | -100 | 150 | mA | 1 | ||
| Reference input current range | IREF | -0.05 | 10 | mA | 1 | ||
| Power dissipation | PD | 200 | mW | 1 | |||
| Solder temperature / time | Td | 260 | ℃ | 10 s (printed as 260/10 ℃/S) | 1 | ||
| Junction and storage temperature | TJ,Tstg | -40 | 125 | ℃ | 1 | ||
| Operating ambient temperature | Top | -25 | 85 | ℃ | 1 | ||
| Thermal resistance junction-ambient | RΘJA | 625 | ℃/W | junction to ambient | 1 |
CAD (KiCad official)
- Symbol:
TL431-1% - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
tl431-1-etched.step/tl431-1-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431-1.step/tl431-1.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: FOSAN datasheet (4 pp, sha256
9becadd63f85cda8, retrieved 2026-10-17, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).