1608-sized, high brightness ‘single rank’ chip LEDs simplify design-in

December 16, 2015 // By Graham Prophet
Rohm has added high accuracy, single-rank 1608-size high-brightness chip LEDs for general purpose application; 75% less brightness variation compared to conventional products contribute to improved performance and reduced design load.

The need to reduce brightness variations is increasing as a greater number of applications and devices, particularly in the automotive and industrial sectors, are demanding improved consistency when configuring multiple LEDs side-by-side. However, up to now it has been difficult to minimise brightness variations during the manufacturing process. Conventionally, users were able to only narrow down the number of ranks from around 4 to 2-3, which still required sorting and the use of different resistors to match each rank, increasing the number of man-hours required along with inventory management.

Rohm’s SML-D15 series was developed using an integrated manufacturing system (from device fabrication), allowing the company to surpass the limits of conventional LED production. As a result, high-accuracy brightness is achieved and brightness variations reduced by 75%. This makes it possible to provide a single rank of brightness (which Rohm claims as a rarity in the industry), significantly lightening design load.

By optimising the LED element Rohm was able to improve brightness by up to three times over conventional products, delivering class-leading brightness in the 1608 size (1.6 x 0.8 mm). The LEDs are also AEC-Q101 qualified, making them suitable for applications demanding increased reliability such as automotive systems.

Rohm Semiconductor; www.rohm.com/eu