# TL431AIDBVR

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

TL431AIDBVR 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/TL431A/TL431B DBV (SOT-23-5) package pinout. |
| 2 | NC | unconnected | No internal connection, but this pin is attached to the die substrate; the datasheet states it must be connected to ANODE or left open. |
| 3 | CATHODE | bidirectional | Shunt current/voltage (I/O) terminal of the regulator; recommended continuous cathode current range is 1 mA to 100 mA (absolute maximum -100 mA to 150 mA) with cathode voltage up to 37 V absolute maximum (36 V recommended maximum). |
| 4 | REF | input | Reference input threshold voltage relative to the common ANODE pin; must be driven with a reference input current (typical 2 µA, max 4 µA) and is internally regulated to approximately 2.5 V (Vref = 2440-2550 mV typical range) in closed-loop operation. |
| 5 | ANODE | power_in | Common pin of the device, described in the datasheet as typically connected to ground (通常接地); serves as the reference/return terminal for the cathode current and reference voltage. |

## 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, TA = 25°C | 11 |
| Reference voltage deviation over full temperature range | VI(dev) |  | 5 | 50 | mV | VKA = Vref, IKA = 10mA; all other devices (not SOT23-3 / TL432) | 11 |
| Reference voltage change per cathode voltage change | ΔVref / ΔVKA |  | -1.4 | -2.7 | mV/V | IKA = 10mA, ΔVKA = 10V - Vref | 11 |
| Reference voltage change per cathode voltage change | 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 full temperature range | 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 | Minimum printed as Vref (not numeric) | 6 |
| Continuous cathode current range | IKA | 1 |  | 100 | mA |  | 6 |
| Operating free-air temperature range (TL43xxI) | TA | -40 |  | 85 | ℃ | Natural ventilation, TL43xxI grade | 6 |
| Cathode voltage (absolute maximum) | VKA |  |  | 37 | V | Referenced to ANODE | 6 |
| Continuous cathode current | IKA | -100 |  | 150 | mA |  | 6 |
| Reference input current (absolute maximum) | II(ref) | -0.05 |  | 10 | mA |  | 6 |
| Operating junction temperature | TJ |  |  | 150 | °C |  | 6 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 6 |
| Junction-to-ambient thermal resistance | RθJA |  | 206 |  | °C/W | DBV (5-pin) package | 6 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 131 |  | °C/W | DBV (5-pin) package | 6 |

## CAD (KiCad official)

- Symbol: `TL431AIDBVR`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `tl431aidbvr-etched.step` / `tl431aidbvr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl431aidbvr.step` / `tl431aidbvr.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 2026-09-22, 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/tl431aidbvr-datasheet.pdf)