component
TL431BQDBZR
Public Unreviewedby Ray
Texas Instruments Voltage Reference, SOT-23-3. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownTL431BQDBZR
Texas Instruments · Voltage Reference · SOT-23-3
TL431BQDBZR 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 cathode (K). Shunt current/voltage input; connects to the load via a series resistor. Sinks 1 mA to 100 mA when regulating; cathode voltage is set by the divider that drives REF to Vref (~2.5 V). |
| 2 | REF | input | Reference input to the internal error amplifier. Compared against the internal ~2.5 V bandgap reference; connect to the tap of the external resistor divider from CATHODE to ANODE to program the regulated cathode voltage. |
| 3 | ANODE | passive | Shunt anode (A). Common return, normally tied to circuit ground. |
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.
TL431BQDBZRTL431BQDBZRDBZTTL431BQDBZRDBVRTL431BQDBZRDBVTTL431BQDBZRDRTL431BQDBZRDTL431BQDBZRPTL431BQDBZRPSTL431BQDBZRPWRTL431BQDBZRPWTL431BQDBZRLPTL431BQDBZRLPRTL431BQDBZRLPMTL431BQDBZRDCKRTL431BQDBZRDCKTTL431BQDBZRPK
CAD (KiCad official)
- Symbol:
TL431BQDBZR - 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 (86 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).