White chip LED improves industrial displays

Offered in a 1608 (1.6 x 0.8mm) package, the SMLD12WBN1W is a white chip LED that achieves class-leading reliability, claims Rohm Semiconductor. The package is claimed to offer superior mountability and long operational life, making it suitable for use in display panels (e.g. temperature control displays) in industrial and compact consumer equipment.

The need to improve both design quality and visibility of industrial equipment has increased the use of compact white LEDs for numerical displays and visual indicators. High-reliability LEDs are required to guarantee no degradation in luminosity even with continuous operation for over 10 years. Epoxy or silicone resins for molding typical white chip LEDs was not practical as these materials could not provide enough reliability to prevent degradation in luminosity or provide enough package strength to facilitate mounting on circuit boards.

ROHM now adds white to its 1608-size chip LEDs offering. The adoption of a new material that combines the benefits of epoxy and silicone resins made it possible to achieve class-leading reliability of white chip LED in the small package.

Tests have demonstrated that the SMLD12WBN1W maintained 100 per cent of its luminosity after operating for 1,000 hours (at 25 degrees C, IF=20mA). This represents an improvement of 20x in operational life when compared to other similar products available in the market, says Rohm. Additional tests showed that the package strength was improved 25 times with the new material when compared to products using silicone resin. This will contribute to significantly reducing the occurrence of failures during fabrication when mounting on circuit boards.

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