# XB431-TL

**XINLUDA** · Voltage References · SOT-23

XB431-TL from XINLUDA, in a SOT-23. 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 | Ref | input | REF input pin whose threshold is related to the voltage of the anode pin, which sets the programmed output voltage (2.5 V to 36 V range). |
| 2 | Cathode | bidirectional | Cathode is the voltage input and shunts the regulated current; recommended cathode voltage is up to 36 V and cathode current 1 mA to 100 mA. |
| 3 | Anode | output | Anode must be connected directly to GND, per the datasheet pin function table. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | XINLUDA |
| Package | SOT-23 |
| Category | Power Management ICs |
| 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 input voltage | Vref | 2.483 | 2.495 | 2.507 | V | VKA=VREF, IKA=10mA | 2 |
| Reference voltage tolerance at 25°C |  | -0.5 |  | 0.5 | % | Printed as 2.495V ± 0.5% at 25°C (Features) | 1 |
| Deviation of reference input voltage over temperature | △Vref/△T |  | 4.5 | 17 | mV | VKA=VREF, IKA=10mA, TMIN≤Ta≤TMAX (0 to 70℃) | 2 |
| Ratio of change in reference input voltage to change in cathode voltage (10V to VREF) | △Vref/△VKA |  | -1.1 | -2.9 | mV/V | IKA=10mA, △VKA=10V~VREF | 2 |
| Ratio of change in reference input voltage to change in cathode voltage (36V to 10V) | △Vref/△VKA |  | -0.6 | -2.2 | mV/V | IKA=10mA, △VKA=36V~10V | 2 |
| Reference input current | Iref |  | 1.6 | 5 | µA | IKA=10mA, R1=10kΩ, R2=∞ | 2 |
| Deviation of reference input current over full temperature range | △Iref/△T |  | 0.5 | 1.3 | µA | IKA=10mA, R1=10kΩ, R2=∞, TA=0℃ to 70℃ | 2 |
| Minimum cathode current for regulation | IKA(min) |  | 0.45 | 1 | mA | VKA=VREF | 2 |
| Off-state cathode current | IKA(OFF) |  | 0.05 | 1.1 | µA | VKA=36V, VREF=0 | 2 |
| Dynamic impedance | ZKA |  | 0.2 | 0.5 | Ω | VKA=VREF, IKA=1 to 100mA, f≤1.0kHz | 2 |
| Cathode voltage (absolute maximum) | VKA |  |  | 37 | V | Operating ambient temperature range applies unless otherwise specified | 2 |
| Cathode current range (continuous) | IKA | -100 |  | 150 | mA | Continuous | 2 |
| Reference input current range | Iref | 0.05 |  | 10 | mA |  | 2 |
| Power dissipation | PD |  |  | 300 | mW |  | 2 |
| Thermal resistance from junction to ambient | RθJA |  |  | 420 | ℃/W |  | 2 |
| Operating ambient temperature | Topr | -20 |  | 80 | ℃ |  | 2 |
| Junction temperature | TJ |  |  | 150 | ℃ |  | 2 |
| Storage temperature range | TSTG | -40 |  | 150 | ℃ |  | 2 |
| Cathode voltage (recommended) | VKA |  | 36 |  | V | Recommended operating conditions | 2 |
| Cathode current range (continuous, recommended) | IKA | 1 |  | 100 | mA | Continuous | 2 |
| Operating ambient temperature range (recommended) | Topr | 0 |  | 70 | ℃ |  | 2 |

## CAD (KiCad official)

- Symbol: `XB431-TL`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `xb431-tl-etched.step` / `xb431-tl-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `xb431-tl.step` / `xb431-tl.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [XINLUDA datasheet](docs/xb431-tl-datasheet.pdf) (5 pp, sha256 `beaa04eb3af1a165`, retrieved 2026-11-05, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (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/xb431-tl-datasheet.pdf)