TL431-0.5%

@@ -0,0 +1,46 @@+# 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)++## 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)

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