# TL431LIAEDBZRQ1

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

TL431LIAEDBZRQ1 from Texas Instruments, in a SOT-23-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | CATHODE | output | Regulated cathode output voltage (2.495V to 36V) with shunt current sink (0.6mA minimum, 15mA maximum). |
| 2 | REF | input | Reference input threshold relative to anode; requires minimum 0.4µA input current for proper biasing of the internal reference amplifier. |
| 3 | ANODE | power_in | Ground/common anode reference pin; all circuit potentials referenced relative to this pin. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `TL431LIAEDBZRQ1`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `tl431liaedbzrq1-etched.step` / `tl431liaedbzrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl431liaedbzrq1.step` / `tl431liaedbzrq1.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/tl431li-q1) (35 pp, sha256 `05850016b6d74f2c`, retrieved 2026-09-26, tier: lcsc)
- **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/tl431liaedbzrq1-datasheet.pdf)