# TL431AIDBZRG4

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

TL431AIDBZRG4 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 input terminal; feedback voltage compared with internal 2.5 V reference to set output voltage or threshold level with bias current of 2-4 µA minimum. |
| 2 | CATHODE | output | Output terminal that sources or sinks regulated current from 1 mA to 100 mA maximum at output voltage adjustable from 2.5 V to 36 V. |
| 3 | ANODE | power_in | Ground return terminal serving as common reference point for all device currents and voltages; typically connected to circuit ground. |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reference voltage (AI grade, 25°C) | Vref | 2470 | 2495 | 2520 | mV | VKA = Vref, IKA = 10mA | 11 |
| Reference voltage deviation over temperature (SOT-23-3 device) | VI(dev) |  | 14 | 34 | mV | VKA = Vref, IKA = 10mA; SOT23-3 device | 11 |
| Reference voltage change ratio to cathode voltage (10V to Vref) | ΔVref/ΔVKA |  | -1.4 | -2.7 | mV/V | IKA = 10mA, ΔVKA = 10V - Vref | 11 |
| Reference voltage change ratio to cathode voltage (36V to 10V) | ΔVref/ΔVKA |  | -1 | -2 | mV/V | IKA = 10mA, ΔVKA = 36V - 10V | 11 |
| Reference input current | Iref |  | 2 | 4 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 11 |
| Reference input current deviation over temperature | II(dev) |  | 0.8 | 2.5 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 11 |
| Minimum cathode current for regulation | Imin |  | 0.4 | 0.7 | mA | VKA = Vref | 11 |
| Off-state cathode current | Ioff |  | 0.1 | 0.5 | µA | VKA = 36V, Vref = 0 | 11 |
| Dynamic impedance | /ZKA/ |  | 0.2 | 0.5 | Ω | VKA = Vref, f ≤ 1kHz, IKA = 1mA to 100mA | 11 |
| Cathode voltage | VKA |  |  | 36 | V | Printed minimum is Vref (not a number); maximum 36 V | 6 |
| Continuous cathode current | IKA | 1 |  | 100 | mA |  | 6 |
| Operating free-air temperature (TL43xxI) | TA | -40 |  | 85 | °C | Natural ventilation, TL43xxI grade | 6 |
| Cathode voltage | VKA |  |  | 37 | V | Referenced to ANODE | 6 |
| Continuous cathode current range | IKA | -100 |  | 150 | mA |  | 6 |
| Reference input current | II(ref) | -0.05 |  | 10 | mA |  | 6 |
| Operating virtual junction temperature range | TJ |  |  | 150 | °C |  | 6 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 6 |
| Junction-to-ambient thermal resistance (DBZ package) | RθJA |  |  | 206 | °C/W | DBZ (SOT-23-3) column of thermal table | 6 |
| Junction-to-case (top) thermal resistance (DBZ package) | RθJC(top) |  |  | 76 | °C/W | DBZ (SOT-23-3) column of thermal table | 6 |

## CAD (KiCad official)

- Symbol: `TL431AIDBZRG4`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `tl431aidbzrg4-etched.step` / `tl431aidbzrg4-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl431aidbzrg4.step` / `tl431aidbzrg4.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 `313277b9351e61ed`, retrieved 2026-09-23, 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-5` (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/tl431aidbzrg4-datasheet.pdf)