New compact high output lens LEDs eliminate the need for light leakage countermeasures

19-07-2019 | ROHM Semiconductor | Lighting Technologies

ROHM has announced compact high output surface mount LEDs equipped with lens. This new range includes 18 devices, composed of the CSL0901 series highlighting standard brightness and the high brightness CSL0902 series.


The company has taken a step ahead to develop products targeting applications that demand high reliability at the component level, such as developing high-brightness silver-free LEDs to prevent sulfuration, which is one of the leading causes of ageing.


This newest series consists of automotive-grade products that secure high reliability in vehicle instrument clusters which work under harsh environments. Raising the light source position from 0.18mm in standard products to 0.49mm enabled the company to significantly decrease light leakage. Meanwhile, size was decreased by approximately 18x in comparison to conventional reflector-type LEDs.


Furthermore, all devices are created to stop light degradation even under high-temperature environments such as automotive. The company also developed a new type of resin for blue, green and white LEDs to deliver higher reliability. As a result, through high-temperature testing with blue LEDs (85C, IF=20mA, 1,000hrs operation), the company achieved improved residual luminosity rate of approximately 80% over conventional products, adding to greater application reliability. Moreover, obtaining higher precision during the manufacturing process while maintaining the compact 1608 size (1.6mm x 0.8mm) made it possible to increase core brightness by five to seven times over conventional LEDs.

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