# CSL1901DW1

**ROHM Semicon** · LED Indication - Discrete · 0603

CSL1901DW1 from ROHM Semicon, in a 0603. 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/csl1901dw1/render/states.json"}

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | K | passive | Cathode electrode, marked by the cathode index on the left side of the bottom view in Figure 1; reverse voltage limit VR is 5V. |
| 2 | A | passive | Anode electrode on the right side of the bottom view in Figure 1; forward current IF is 20mA max (100mA peak at duty 1/10, 1kHz), and VF is 1.7 to 2.2V (1.8V typ) at IF=2mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ROHM Semicon |
| Package | 0603 |
| 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 |
|---|---|---|---|---|---|---|---|
| Forward Current | IF |  |  | 20 | mA | Ta=25℃ | 1 |
| Peak Forward Current | IFP |  |  | 100 | mA | Ta=25℃ | 1 |
| Reverse Voltage | VR |  |  | 5 | V | Ta=25℃ | 1 |
| Power Dissipation | PD |  |  | 44 | mW | Ta=25℃ | 1 |
| Operation Temperature | Topr | -40 |  | 85 | ℃ |  | 1 |
| Storage Temperature | Tstg | -40 |  | 100 | ℃ |  | 1 |
| Forward Voltage | VF | 1.7 | 1.8 | 2.2 | V | IF=2mA | 1 |
| Luminous Intensity | IV | 6.3 | 9.4 | 25 | mcd | IF=2mA | 1 |
| Reverse Current | IR |  |  | 10 | μA | VR=5V | 1 |
| Dominant Wave Length | λD | 602 | 605 | 608 | nm | IF=2mA | 1 |
| Thermal Resistance (Junction/Solder Point) | Rθj-s |  | 410 |  | ℃/W | Evaluation board: glass epoxy FR4 30x10mm, t=0.8mm; Cu pad 4.0x4.0mm (cathode), t=0.035mm | 14 |
| Thermal Resistance (Junction/Ambient) | Rθj-a |  | 650 |  | ℃/W | Evaluation board: glass epoxy FR4 30x10mm, t=0.8mm; Cu pad 4.0x4.0mm (cathode), t=0.035mm | 14 |
| Junction Temperature | TjMax |  |  | 100 | ℃ |  | 14 |

## CAD (KiCad official)

- Symbol: `CSL1901DW1`
- Footprint: `LED_SMD:LED_0603_1608Metric`
- 3D model: 0603 (KiCad packages3D, STEP)
- 3D model files: `csl1901dw1-etched.step` / `csl1901dw1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `csl1901dw1.step` / `csl1901dw1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ROHM Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602553409879236608) (18 pp, sha256 `fde61fa97af29f8f`, retrieved 2026-10-18, 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/csl1901dw1-datasheet.pdf)