component
TL431-0.5%
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TDSEMIC Voltage Reference, SOT-23. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
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TL431-0.5%
TDSEMIC · Voltage Reference · SOT-23
TL431-0.5% from TDSEMIC, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | REF | input | Reference input to the internal error amplifier's non-inverting input. Compared against the internal 2.5 V Vref; drives cathode current when REF exceeds Vref. Reference input current range is up to 10 mA (absolute max); typical low regulation current is 240 uA. |
| 2 | CATHODE | power_in | Cathode (K) of the shunt regulator. Sinks current to hold the REF pin at 2.5 V. Operating cathode voltage Vka = Vref (2.5 V) to 36 V; cathode current 0.3 mA to 100 mA (absolute max -100 to 150 mA). |
| 3 | ANODE | power_in | Anode (A) of the shunt regulator; connects to the circuit's low-side / ground return for the reference current path. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | TDSEMIC |
| Package | SOT-23 |
| Category | Power Management (PMIC) |
| Pins | 3 |
Ordering variants
Same part, different packaging or reel option.
TL431-0.5%NTL431-0.5%Z
CAD (KiCad official)
- Symbol:
TL431-0.5% - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
tl431-0-5-etched.step/tl431-0-5-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431-0-5.step/tl431-0-5.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: TDSEMIC datasheet (13 pp, sha256
9792a244d74188a4, retrieved 2026-08-17, 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:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).
# TL431-0.5%
**TDSEMIC** · Voltage Reference · SOT-23
TL431-0.5% from TDSEMIC, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
## Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | REF | input | Reference input to the internal error amplifier's non-inverting input. Compared against the internal 2.5 V Vref; drives cathode current when REF exceeds Vref. Reference input current range is up to 10 mA (absolute max); typical low regulation current is 240 uA. |
| 2 | CATHODE | power_in | Cathode (K) of the shunt regulator. Sinks current to hold the REF pin at 2.5 V. Operating cathode voltage Vka = Vref (2.5 V) to 36 V; cathode current 0.3 mA to 100 mA (absolute max -100 to 150 mA). |
| 3 | ANODE | power_in | Anode (A) of the shunt regulator; connects to the circuit's low-side / ground return for the reference current path. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | TDSEMIC |
| Package | SOT-23 |
| Category | Power Management (PMIC) |
| Pins | 3 |
## Ordering variants
Same part, different packaging or reel option.
- `TL431-0.5%N`
- `TL431-0.5%Z`
## CAD (KiCad official)
- Symbol: `TL431-0.5%`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `tl431-0-5-etched.step` / `tl431-0-5-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl431-0-5.step` / `tl431-0-5.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [TDSEMIC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8614112909643833344) (13 pp, sha256 `9792a244d74188a4`, retrieved 2026-08-17, 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:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).
[Datasheet PDF](docs/tl431-0-5-datasheet.pdf)