# LTL431APTLT1G

**LRC** · Voltage Reference · SOT-23

LTL431APTLT1G from LRC, 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 | CATHODE | passive | Cathode of the programmable shunt regulator; the output voltage is set by the external divider on the REF pin, and the cathode current must stay within the datasheet limits to keep the device in regulation. |
| 2 | REF | input | Reference input pin that regulates to the internal reference voltage (Vref, 2.470 V to 2.525 V depending on the grade), with a reference input current of about 4 µA at 25 °C. |
| 3 | ANODE | passive | Anode of the shunt regulator, the common return for the cathode current, which the datasheet states must be held at the anode reference for the specified electrical characteristics. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LRC |
| Package | SOT-23 |
| 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 input voltage (rank 0.5%, classification range) | VREF | 2.482 |  | 2.507 | V | Classification table, LTL431APTLT1 (rank 0.5%), Tamb -40~+125 °C | 2 |
| Reference voltage tolerance (rank) |  | -0.5 |  | 0.5 | % | Rank 0.5% for LTL431APTLT1 | 2 |
| Operating ambient temperature range | TOPR | -40 |  | 125 | °C | Classification table range for LTL431APTLT1 | 2 |

## CAD (KiCad official)

- Symbol: `LTL431APTLT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ltl431aptlt1g-etched.step` / `ltl431aptlt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ltl431aptlt1g.step` / `ltl431aptlt1g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [LRC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586176325472702464) (5 pp, sha256 `f72860759bbf8e8d`, retrieved 2026-10-18, 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/ltl431aptlt1g-datasheet.pdf)