component
TL431D
Public Made by Adomby adom
ALJ 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
markdownTL431D
ALJ · Voltage Reference · SOT-23
TL431D from ALJ, 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 | REFERENCE | input | Reference input of the adjustable shunt regulator, which is regulated to VREF of 2.485 V min, 2.495 V typ and 2.505 V max at VKA = VREF and IKA = 1 mA. |
| 2 | CATHODE | passive | Cathode terminal, rated to 40 V absolute maximum with a continuous cathode current of -100 to 120 mA, and recommended operating up to 36 V with IKA of 0.1 to 100 mA. |
| 3 | ANODE | passive | Anode terminal, the other current-carrying terminal of the shunt regulator, which must sink at least 40 µA typ (80 µA max) of cathode current for regulation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ALJ |
| Package | SOT-23 |
| Category | Power Management (PMIC) |
| Pins | 3 |
CAD (KiCad official)
- Symbol:
TL431D - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
tl431d-etched.step/tl431d-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431d.step/tl431d.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ALJ datasheet (9 pp, sha256
20bc8649b08decae, retrieved 2026-10-09, 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).