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Optoelectronics/Displays??

Tri-color SMT LEDs operate in extreme outdoors

Posted: 04 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:tri-color LEDs? high-brightness RGB LEDs? ASMT-QTB2 series?

Avago's ASMT-QTB2 series of high-brightness RGB LEDs

Avago Technologies announced a new series of high-brightness SMT tri-color LEDs that will enable designers to develop large indoor and outdoor electronic displays that provide sharper and more vivid images and graphics. This new series of high-brightness RGB LEDs from Avago are available in standard PLCC-4 packaging and have been specifically designed to operate in extreme outdoor conditions.

Avago's ASMT-QTB2 series of high-brightness AllnGaP and InGaN tri-color LEDs, which are made from an enhanced silicone resin material, provide high reliability, long life and significantly less color degradation over time. The ASMT-QTB2 series also offers a wide viewing angle of 120 to improve visibility of large outdoor displays in bright sunlight. Applications for the device include stadium scoreboards, billboards, marquee signs and electronic variable message signs.

Aside from high brightness, long life and compact size, the ASMT-QTB2 SMT LEDs provide two significant advantages in the production environment: they can be easily soldered using conventional SMT techniques to minimize production costs and the package is qualified to a JEDEC moisture sensitive level (MSL) rating of 2a. For manufacturers, this rating means that these LEDs can be kept in the open air (30C, 60 percent relative humidity) for up to four weeks after being removed from its sealed package without the need to remove absorbed moisture.

The InGaN and AllnGaP technology incorporated in Avago's ASMT-QTB2 LED package offers low thermal resistance, which allows more efficient heat transfer from the package to the motherboard thus, maintaining long-term device reliability. Moreover, it is compatible with standard SMT reflow soldering processes. With an MSL rating of 2a, customers will have greater flexibility during assembly of their products.




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