Ultrabright LEDS shine for automotive, traffic light apps
By Gina Roos
EET
06/12/2003 11:00 AM EST
URL: ebnews.com
San Jose -- Using aluminum indium gallium phosphide (AlInGaP) and indium gallium nitride (InGaN), Fairchild Semiconductor and Vishay Intertechnology Inc. have independently launched ultrabright LEDs for automotive lighting and traffic signal displays that the companies say can replace incandescent lamps in those applications.
The surface-mount LED lamps in the Fairchild QTLP673C series are designed for interior automotive lighting applications as well as traffic lights and signs. The company said the parts are capable of sustaining higher drive current and reducing thermal resistance, which translates into higher brightness in a variety of colors.
Fairchild (San Jose) uses Al-InGaP technology to produce a typical luminous intensity of 700 to 800 millicandelas (mcd) for red, orange, yellow and yellow-orange lamps. The company uses InGaN technology to produce a luminous intensity of 920 mcd for true green and cyan lamps, and 178 mcd for blue lamps. The company said the solid-state reliability and long life cycle of the LEDs make them cost-effective alternatives to incandescent lamps.
Housed in a PLCC-4 package, the low-profile QTLP673C units (3.2 x 2.8 x 1.8 mm) can be used in printed-circuit-board-mounted backlighting applications in dashboards, control consoles, signal lights and signs. Available on tape and reel in quantities of 2,000 per reel, the parts are said to withstand infrared reflow and wave soldering.
The QTLP673-C-R (red), E (orange), O (yellow/orange) and Y (yellow) LEDs are priced at 25 cents each in quantities of 10,000. The QTLP673C-IB (blue), IG (true green) and IC (cyan) LED lamps are priced at 70 cents in the same quantities. Delivery is six weeks.
Vishay Intertechnology (Malvern, Pa.) has also launched a series of LEDs that the company says can replace incandescent lights in turn signals and front-panel indicators as well as in high-mounted stop lights, advertising displays, and traffic signals and signs.
The four high-intensity 30 degrees -angle LEDs target applications that require extrabright output and visibility.
The TLCx52xx series of clear, nondiffused 5-mm LEDs from Vishay Semiconductors offers a luminous intensity of as much as 4,000 mcd for red, yellow, true green and blue.
The TLCR5200 red and TLCY5200 yellow LEDs offer a typical luminous intensity of 4,000 mcd at a forward current of 50 milliamps.
The TLCTG5200 true green and TLCB5200 blue LEDs provide a luminous intensity of 2,000 mcd and 700 mcd, respectively, at a forward current of 30 mA.
The TLCx52xx family operates in a temperature range of -40 degrees C to 100 degrees C. The parts also offer an ESD-withstand voltage of 2 kV under MIL-STD-883D, Method 3015.7 for AlInGaP units and 1 kV for InGaN units. All four of the LEDs also offer a plus/minus 15 degrees angle of half intensity.
The TLCR5200 and TLCY5-200 are rated for a 125 degrees C junction temperature while the TLCTG-5200 and TLCB5200 are rated for a 100 degrees C junction temperature.
Prices for the TLCR5200 and TLCY5200 LEDs start at $11.50 per 100 pieces in quantities of 100,000. Prices start at $48.50 per 100 pieces in quantities of 100,000 for the TLCTG5200 and TLCB5200. Delivery for large orders takes approximately four to eight weeks. |
