# LTL431AKLT1G

**LRC** · Voltage Reference · SOT-23

LTL431AKLT1G 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 (K) of the programmable shunt reference; output voltage settable from Vref (approx. 2.5V) to 36V (VKA max 36V), with cathode current of 0.1mA to 100mA. |
| 2 | REF | input | Reference (R) input that sets the regulated cathode voltage via an external resistor divider; typical Vref is 2.5V and reference input current range is -0.05 to +10mA. |
| 3 | ANODE | power_in | Anode (A) of the shunt reference, normally connected to ground, as the return for cathode current. |

## 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 (1%, Vref 2 class) | Vref | 2.47 | 2.495 | 2.52 | V | VKA=VREF, IKA=10mA | 2 |
| Deviation of reference input voltage over temperature | Vref |  | 8 | 17 | mV | VKA=VREF, IKA=10mA, TMIN~TMAX | 2 |
| Ratio of change in reference input voltage to change in cathode voltage | Vref/VKA |  |  | -2.7 | mV/V | IKA=10mA, VKA=10V~VREF | 2 |
| Ratio of change in reference input voltage to change in cathode voltage | Vref/VKA |  |  | -1 | mV/V | IKA=10mA, VKA=36V~10V | 2 |
| Dynamic impedance | ZKA |  | 0.1 | 0.37 | Ω | VKA=VREF, IKA=0.2 to 100mA, f 1.0kHz | 2 |
| Cathode current (continuous) range | IKA | -100 |  | 150 | mA | Continuous | 2 |
| Reference input current range | Iref | -0.05 |  | 10 | mA |  | 2 |
| Operating junction temperature | Tj |  |  | 150 | °C |  | 2 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 2 |
| Cathode current | IKA |  |  | 100 | mA |  | 2 |
| Cathode voltage (settable range) | VKA |  |  | 36 | V |  | 1 |
| Operating ambient temperature range | Topr | -40 |  | 125 | °C |  | 2 |
| Thermal resistance, junction to ambient | θJA |  | 206 |  | °C/W |  | 2 |
| Excellent temperature coefficient |  |  | 25 |  | ppm/°C |  | 1 |

## CAD (KiCad official)

- Symbol: `LTL431AKLT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ltl431aklt1g-etched.step` / `ltl431aklt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ltl431aklt1g.step` / `ltl431aklt1g.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/8590201344587444224) (5 pp, sha256 `aad953baa92b0920`, retrieved 2026-10-17, 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/ltl431aklt1g-datasheet.pdf)