KIA431AF-RTF

@@ -0,0 +1,54 @@+# KIA431AF-RTF++**KEC Semicon** · Voltage Reference · SOT-89-3++KIA431AF-RTF from KEC Semicon, in a SOT-89-3. 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. High-impedance input to the internal error amplifier that is compared against the 2.495 V bandgap. Typically tied to the tap of an external R1/R2 divider from cathode to anode to program Vka = Vref x (1 + R1/R2) + Iref x R1. Input current 1.8 uA typ, 4.0 uA max at 25 C. |+| 2 | A | power_in | Anode. Common/ground-side terminal of the shunt regulator; the internal reference and error amp are referenced to this pin. For SOT-89 the heat sink tab is electrically common to pin 2 (Anode). |+| 3 | K | power_in | Cathode. Regulated shunt output; sinks current through an external series resistor from the supply to hold Vka at the programmed value. Absolute max Vka = 37 V; continuous cathode current range -100 to +150 mA; minimum cathode current for regulation 0.5 mA typ (1.0 mA max). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | KEC Semicon |+| Package | SOT-89-3 |+| Category | PMIC |+| Pins | 3 |++## Ordering variants++- `KIA431AF-RTFF`+- `KIA431AF-RTFZF`+- `KIA431AF-RTFAF`+- `KIA431AF-RTFBF`+- `KIA431AF-RTFAF-RTF`+- `KIA431AF-RTF(blank)`+- `KIA431AF-RTFZ`+- `KIA431AF-RTFA`+- `KIA431AF-RTFB`+- `KIA431AF-RTFM`+- `KIA431AF-RTFZM`+- `KIA431AF-RTFAM`+- `KIA431AF-RTFBM`++## CAD (KiCad official)++- Symbol: `KIA431AF-RTF`+- Footprint: `Package_TO_SOT_SMD:SOT-89-3`+- 3D model: SOT-89-3 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [KEC Semicon datasheet](docs/kia431af-rtf-datasheet.pdf) (7 pp, sha256 `b0b1ac14e62a5a3f`, retrieved 2026-08-17, tier: lcsc)+- **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/kia431af-rtf-datasheet.pdf)

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