# LTST-C281TBKT-5A

**Lite On** · LED Indication - Discrete · 0402

LTST-C281TBKT-5A from Lite On, in a 0402. 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.


::adom-states{src="/adom/ltst-c281tbkt-5a/render/states.json"}

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | K | passive | Cathode (−) soldering terminal, identified by the green cathode mark on the package; reverse voltage is only applied for the IR test (VR = 5V) and the device is not designed for reverse operation. |
| 2 | A | passive | Anode (+) soldering terminal; the polarity symbol shows + on this side, with DC forward current limited to 20 mA (100 mA peak at 1/10 duty, 0.1 ms) and an external series resistor recommended. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Lite On |
| Package | 0402 |
| Category | Optoelectronics |
| Pins | 2 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Luminous Intensity | IV | 11.2 |  | 45 | mcd | IF = 5mA, Note 1 | 5 |
| Dominant Wavelength | λd | 470 |  | 475 | nm | IF = 5mA, Note 3 | 5 |
| Forward Voltage | VF | 2.65 |  | 3.15 | V | IF = 5mA | 5 |
| Power Dissipation |  |  |  | 76 | mW |  | 3 |
| Peak Forward Current |  |  |  | 100 | mA | 1/10 Duty Cycle, 0.1ms Pulse Width | 3 |
| DC Forward Current |  |  |  | 20 | mA |  | 3 |
| Operating Temperature Range |  | -20 |  | 80 | °C |  | 3 |
| Storage Temperature Range |  | -30 |  | 100 | °C |  | 3 |
| Infrared Soldering Condition |  |  |  | 260 | °C | For 10 Seconds | 3 |

## CAD (KiCad official)

- Symbol: `LTST-C281TBKT-5A`
- Footprint: `LED_SMD:LED_0402_1005Metric`
- 3D model: 0402 (KiCad packages3D, STEP)
- 3D model files: `ltst-c281tbkt-5a-etched.step` / `ltst-c281tbkt-5a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ltst-c281tbkt-5a.step` / `ltst-c281tbkt-5a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Lite On datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590905477813788672) (13 pp, sha256 `59ee6edc139d1f0a`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/ltst-c281tbkt-5a-datasheet.pdf)