# TL431AQDBVR

**Texas Instruments** · Voltage Reference · SOT-23-5

TL431AQDBVR from Texas Instruments, in a SOT-23-5. 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 | NC | unconnected | No internal connection on the TL431 (not TL432) SOT-23-5 (DBV) package, per the pin configuration diagram for TL431, TL431A, TL431B ... DBV. |
| 2 | NC | unconnected | No functional internal connection; this pin is attached to the die substrate and, per the datasheet footnote, must be connected to ANODE or left open. |
| 3 | CATHODE | bidirectional | Shunt-regulator I/O (cathode) pin that sinks the parallel current; recommended continuous cathode current is 1 mA to 100 mA while VKA is regulated between Vref (~2.5 V) and 36 V (absolute maximum continuous cathode current −100 mA to 150 mA, absolute maximum VKA 37 V). |
| 4 | REF | input | Reference/threshold input measured relative to the common ANODE pin; typical reference input current is 2 µA (max 4 µA) at IKA=10 mA, with an absolute maximum reference input current range of −0.05 mA to 10 mA. |
| 5 | ANODE | power_in | Common pin that is normally connected to ground/return, forming the current path back from CATHODE through the internal regulator. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |

## 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 | Vref | 2470 | 2495 | 2520 | mV | VKA = Vref, IKA = 10mA | 12 |
| Cathode current, continuous (recommended) | IKA | 1 |  | 100 | mA |  | 6 |
| Operating free-air temperature, TL43xxQ grade | TA | -40 |  | 125 | °C | TL43xxQ | 6 |
| Continuous cathode current range (absolute maximum) | IKA | -100 |  | 150 | mA |  | 6 |
| Reference input current (absolute maximum) | II(ref) | -0.05 |  | 10 | mA |  | 6 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 6 |
| Reference input voltage deviation over full temperature range | VI(dev) |  | 14 | 34 | mV | VKA = Vref, IKA = 10mA | 12 |
| Ratio of reference voltage change to cathode voltage change | ΔVref / ΔVKA |  | -1.4 | -2.7 | mV/V | ΔVKA = 10V - Vref, IKA = 10mA | 12 |
| Ratio of reference voltage change to cathode voltage change | ΔVref / ΔVKA |  | -1 | -2 | mV/V | ΔVKA = 36V - 10V, IKA = 10mA | 12 |
| Reference input current | Iref |  | 2 | 4 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 12 |
| Reference input current deviation over full temperature range | II(dev) |  | 0.8 | 2.5 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 12 |
| Minimum cathode current for regulation | Imin |  | 0.4 | 0.7 | mA | VKA = Vref | 12 |
| Off-state cathode current | Ioff |  | 0.1 | 0.5 | µA | VKA = 36V, Vref = 0 | 12 |
| Dynamic impedance | /ZKA/ |  | 0.2 | 0.5 | Ω | VKA = Vref, f ≤ 1kHz, IKA = 1mA to 100mA | 12 |
| Cathode voltage (recommended; minimum is Vref, not a number) | VKA |  |  | 36 | V |  | 6 |
| Cathode voltage (absolute maximum) | VKA |  |  | 37 | V |  | 6 |
| Operating junction temperature range (absolute maximum) | TJ |  |  | 150 | °C |  | 6 |
| Junction-to-ambient thermal resistance | RθJA |  | 206 |  | °C/W | DBV (SOT-23-5) package column | 6 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 131 |  | °C/W | DBV (SOT-23-5) package column | 6 |

## CAD (KiCad official)

- Symbol: `TL431AQDBVR`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `tl431aqdbvr-etched.step` / `tl431aqdbvr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl431aqdbvr.step` / `tl431aqdbvr.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/tl431aqdbvr-datasheet.pdf)