TL431BQDBZRQ1

@@ -0,0 +1,47 @@+# TL431BQDBZRQ1++**Texas Instruments** · Voltage Reference · SOT-23-3++TL431BQDBZRQ1 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 current or voltage input. Cathode of the internal shunt regulator; conducts current when REF exceeds VREF (2.495 V typ). Recommended operating range VREF to 36 V, cathode current 1-100 mA; dynamic impedance 0.2 Ω typ. |+| 2 | REF | input | Reference/threshold input relative to ANODE. Compared internally against the 2495 mV bandgap reference; drives the shunt element to regulate CATHODE voltage. IREF is 2 µA typ (4 µA max). |+| 3 | ANODE | power_in | Common pin, normally connected to ground. Serves as the reference return for both the REF input and the CATHODE shunt current. |++## 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.++- `TL431BQDBZRQ1`+- `TL431BQDBZRQ1DBVR`+- `TL431BQDBZRQ1DBVT`++## CAD (KiCad official)++- Symbol: `TL431BQDBZRQ1`+- 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-q1) (31 pp, sha256 `6e78e952a7d3e8bc`, 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/tl431bqdbzrq1-datasheet.pdf)

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