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High brightness LED platform targets all types of auto apps

Posted: 08 Mar 2005 ?? ?Print Version ?Bookmark and Share

Keywords:agilent technologies? lumileds lighting? led? envisium? power plcc-4?

Touting the industry's highest light output among competitive offerings, Agilent Technologies Inc. and Lumileds Lighting have rolled out the first three products in their new Envisium mid-power family of LEDs for exterior and interior automotive applications. In the future, new designs will target consumer mobile devices, illuminated signs and signals, and home/building lighting applications.

Using proprietary technologies from both companies, the Envisium Power PLCC-4 (plastic leaded chip carrier) surface-mount LEDs were developed primarily for automotive exterior lighting applications such as center high-mounted stop lights, front turn signals, mirror turn signals and rear combination lights. They can also be used for automotive interior lighting applications such as instrument panel and control backlighting, central console backlighting, and navigation and audio systems.

The Envisium Power PLCC-4 SMT LEDs fill the gap for mid-power illumination capabilities between the current Agilent PLCC-4 products, operating at up to 200mW power levels, and Lumileds Lighting's Luxeon LED light sources that operate at power levels of 1 watt and higher.

"Over the past few years, the 200mW to 1W range has been ignored, and we realized there is a huge need to fill that gap," said Jovani Torres, Americas regional product manager for Agilent's Optoelectronic Products Division.

Available in red, red-orange and amber, the companies claim the use of high-performance Lumileds Lighting's transparent-substrate aluminum indium gallium phosphide (TS AlInGaP) LED die enables the new LEDs to produce a higher luminous flux output than any other PLCC-4 LEDs on the market that are primarily used for auto signaling applications.

The Envisium red LEDs, with a 630nm typical dominant wavelength, provide a luminous intensity of 630mdc to 1,000mcd minimum at 50mA. The luminous intensity for red-orange at 50mA, with a 617nm typical dominant wavelength, is 1,000mcd to 1,580mcd minimum. Amber LEDs, with a 592nm typical dominant wavelength, offers a luminous intensity of 630mcd to 1,000mcd at 50mA. The operating temperature range is -40C to 100C. The company notes that minimum luminous intensity is based on available intensity binning levels. They also offer a wide viewing angle of 120.

What's key about the design of these new LEDs is the combination of TS AlInGaP LED die, and the PLCC-4 package which make them a perfect fit for exterior automotive applications. This combination will allow the auto industry to bring the industry-accepted PLCC package from the interior to the exterior of the automobile in high-volume production, Torres said.

In addition, the Envisium LEDs for exterior auto applications offer several key advantages. These devices are surface-mountable, thinner, and slightly brighter, Torres said. Another key benefit is that the Agilent-designed PLCC-4 SMT package can be driven at high current due to its package and thermal design, and it is compatible with both IR solder reflow and through-the-wave soldering.

Traditionally, these auto applications have used either light bulbs or Piranha lighting, Torres said. "Although many manufacturers use the Piranha lighting in their designs they have a lot of problems using it in this application because it's a four-prong device and requires special manufacturing processes to use them," Torres said.

Based on standard PLCC-4 package dimensions, the Envisium Power LEDs consist of a substrate with a molded plastic reflector on top of a bent lead frame. The die is attached within the reflector cavity, and the cavity is encapsulated by an Agilent proprietary epoxy blend. This package design, along with component materials, allows the LEDs to perform with high reliability over the extended temperature range of -40C to 100C temperature range, a critical spec for the harsh automotive operating environment, said the company.

An Envisium LED for camera flash applications in cell phones is under development for launch between second and fourth quarter 2005.

Pricing for the Envisium PLCC-4 SMT LEDs is less than 20 cents in high-volume quantities. Packaged on tape and reel, every reel will be shipped in single intensity and color bin (except for red) to provide close uniformity. Samples and production quantities are available now with a lead time of four weeks. Products will be sold through Agilent's direct sales channel and authorized distributors.

- Gina Roos

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