New White Chip LEDs: High Luminous Intensity (2.0cd) in a Class-Leading Small 1608 Size (Metric)

Improved ultra-compact design for greater space savings in battery-driven IoT equipment and drones

ROHM has developed ultra-compact high luminous intensity White Chip LEDs, called CSL1104WB. The products are optimized for applications requiring high brightness white light emissions, such as IoT devices, drones, and other battery-equipped applications.

In recent years, high luminous intensity (2.0cd) white LEDs are being increasingly adopted to improve visibility in a range of applications in the consumer electronics and automotive sectors. At the same time, the emergence of applications that mount multiple LEDs in a small space –such as IoT devices and drones – requires high-density mounting. This makes it difficult to achieve high brightness in a compact footprint.

The CSL1104WB series achieves a high luminous intensity of 2.0cd in an ultra-compact 1608 size (1.6mm x 0.8mm = 1.28mm2), which was previously difficult to achieve. The result is the same luminosity as the current mainstream 3528 size PLCC package (3.5mm x 2.8mm = 9.8mm2) but in an 87% smaller form factor.

Moreover, color variation (an issue with white LEDs) is significantly improved, simplifying the color adjustment process by ensuring accurate white color chromaticity. This not only contributes to greater application space savings but also improves design flexibility along with visibility through high-density mounting of high luminosity LEDs, reducing development load considerably. In addition, qualification under the automotive reliability standard AEC-Q102 specifically developed for optical devices is planned, enabling a smooth application inside industrial equipment and automotive applications exposed to harsh environments.

ROHM is committed to further expand its lineup of 1608 size white chip LEDs from low to high brightness – aiming to improve design flexibility while reducing development load (i.e. decreasing application height, simplifying product design).

Key Features

1. High brightness in an ultra-compact size improves design flexibility
The new CSL1104WB series of reflector-type white LEDs provide high 2.0cd luminous intensity in a compact 1608 size by leveraging proprietary compact package technology and adopting a high luminosity chip. As a result, the same luminous intensity as the standard 3528 size PLCC package (3.5mm x 2.8mm = 9.8mm2) is achieved but in the 1608 size, reducing mounting area by 87%. This doesn’t only contribute to greater application space savings but also improves flexibility of design along with visibility (e.g. complete blackout on panels) by supporting high-density mounting of high luminous intensity LEDs, reducing development load considerably.

At the same time, compliance with the automotive reliability standard AEC-Q102 specifically formulated for optical devices is planned, ensuring a smooth application inside industrial equipment and automotive applications exposed to harsh environments.

2. Fine-grained, accurate white color chromaticity simplifies color adjustment

This new product improves color variability, which is an issue with white LEDs, enabling accurate, detailed white representation. Achieving color uniformity simplifies the process of color adjustment, significantly reducing the number of man-hours required for application development (i.e. faithfully reproducing brand colors).