ROHM’s 0603-Size LEDs for low-current low-light applications

10th November 2022

Sheryl Miles

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ROHM has announced the availability of 0603-size (0.6 × 0.3”) / 1608-size (1.6 × 0.8mm) LEDs, CSL1901 series, optimised for low-light applications for use in indicators and numeric displays in Factory Automation equipment (i.e. PLCs) and communication control equipment such as modems and routers.

In recent years, technological advancements in LED elements have resulted in dramatically improved luminous efficiency – leading to increased brightness. At the same time, the market is demanding LEDs tailored to characteristics in the low current range. The reason: higher brightness makes it necessary to design for appropriate luminous intensity and emission wavelengths in applications where interference with adjacent light emitting parts must be considered.

ROHM has developed versatile 0603-size LEDs optimised for low-current drive in low-light applications by leveraging in-house element technology to customise the light-emitting layer of the device.

The CSL1901 series reduces visual variations in brightness and colour under low-light conditions by optimising element characteristics of light emission at 2mA using original device technology. In general, when operating standard LEDs, which guaranteed specification at 20mA, at low currents results in brightness and colour differences that vary from part to part.
Compared to existing products (at 2mA), ROHM’s LEDs reduce brightness variations by half and colour sifting by 3nm, minimising design man-hours required for light emission while improving visibility in indicators and numeric displays. Furthermore, a lineup of five colours is offered in the highly versatile 0603 size – facilitating replacement due to application and model changes.

Going forward, ROHM will continue to offer LEDs that meet customer needs while improving application design and reducing development load.