# TL431AQDBZR

**Texas Instruments** · Voltage Reference · SOT-23-3

TL431AQDBZR 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 | REF | input | Reference/threshold input pin with internal 2.495V reference; requires minimum 2µA input bias current and connects to external resistor divider network that programs the output voltage. |
| 2 | CATHODE | output | Cathode regulated output pin that maintains programmable voltage from Vref to 36V; requires minimum 0.4mA operating current for regulation and supports up to 100mA sink capability. |
| 3 | ANODE | power_in | Anode common/ground pin; device reference node for voltage regulation and current operation, typically connected to system ground or negative supply. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `TL431AQDBZR`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `tl431aqdbzr-etched.step` / `tl431aqdbzr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl431aqdbzr.step` / `tl431aqdbzr.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/tl431) (86 pp, sha256 `0eb18c491f5517a3`, retrieved 2026-09-18, 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:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/tl431aqdbzr-datasheet.pdf)