TL431AQDBZT

@@ -0,0 +1,53 @@+# TL431AQDBZT++**Texas Instruments** · Voltage Reference · SOT-23-3++TL431AQDBZT from Texas Instruments, in a SOT-23-3. 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 | CATHODE | passive | Shunt regulator cathode (K). Sinks 1-100 mA of cathode current when REF exceeds Vref (~2.5 V) - absolute-max continuous IKA = -100 to +150 mA, VKA(max) = 37 V, VKA(recommended) = Vref to 36 V. Output dynamic impedance is typ 0.2 Ω. |+| 2 | REF | input | Reference (feedback) input, threshold relative to ANODE. Internal comparator drives the shunt on when V(REF) ≥ Vref (nominal 2.5 V). Reference input current range -0.05 mA to +10 mA (absolute max); tie to divider tap between CATHODE and ANODE to program the regulated voltage. |+| 3 | ANODE | power_in | Common anode / return terminal - the reference point for VKA and Vref. Tie to system ground in the standard shunt-regulator topology. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOT-23-3 |+| Category | Power Management (PMIC) |+| Pins | 3 |++## Ordering variants++Same part, different packaging or reel option.++- `TL431AQDBZT`+- `TL431AQDBZTDBZR`+- `TL431AQDBZTDBVT`+- `TL431AQDBZTDBVR`+- `TL431AQDBZTPK`+- `TL431AQDBZTD`+- `TL431AQDBZTP`+- `TL431AQDBZTPS`+- `TL431AQDBZTPW`++## CAD (KiCad official)++- Symbol: `TL431AQDBZT`+- Footprint: `Package_TO_SOT_SMD:SOT-23-3`+- 3D model: SOT-23-3 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/tl431) (None pp, sha256 `0eb18c491f5517a3`, 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/tl431aqdbzt-datasheet.pdf)

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