Electronic Design


LED Molded Backlights Employ Patented Light-Guide Technology
Members of a line of tri-color LED molded backlights employ MicroLens molded light-guide technology to enable display engineers to achieve virtually any color in backlit LCD displays, with as few as just one LED. According to the company, the backlights are ideal for small to mid-size displays where different colors are used to convey information.

The molded light guides utilize an LED with three chips that can combine red, green, and blue in varying saturations to yield the colors desired by the display designer. MicroLens is a patented, LED-based technology that offers similar or greater initial brightness than EL backlighting technology. Between 20,000 and 50,000 hours are guaranteed to half brightness, depending on the chip colors and drive current. MicroLens light extraction features are molded into the light guides that encase the LEDs, enabling a larger area to be lit by a single LED than with any other LED-based backlighting technology. This ability eliminates the complications that can arise from mixing the colors from two LEDs.

The tri-color molded backlights can be used for cellular phones, medical instruments, test and measurement instruments, personal digital assistants (PDAs), pagers, and other portable devices. In 250,000-unit quantities, single-LED backlights up to 2.0 in.2 cost $4.00.

Global Lighting Technologies Inc., 8370 Dow Cir., Strongsville, OH 44138; (866) 922-GLTI; fax (440) 922-4585; www.glthome.com.

Series Of Four-Pin Optocouplers Features 2-mm Height Profile
The four-lead TCMT11xx Miniflat optocouplers consist of a phototransistor optically coupled to a gallium-arsenide infrared-emitting diode. The eight optocouplers feature a 2-mm height profile. According to the company, these devices are optimized for miniaturized products such as PCMCIA cards, notebook modems, telecommunications products, programmable logic controllers, and other designs requiring a high level of package integration.

Built on the company's coplanar technology, these optocouplers ensure maximum safety and reliability by providing a stable distance between the emitter and detector chips. Providing an insulation voltage of 3750 VRMS, the surface-mountable devices also feature a transistor output and a forward current of 60 mA. Eight different CTR options range from 80% to 600%. The ambient-temperature range is −40°C to 100°C. The devices also feature a low typical coupling capacitance of 0.3 pF and a low temperature coefficient of current transfer ratio (CTR).

The TCMT11xx optocouplers are supplied in tape-and-reel packaging, with 3000 pieces/reel for high-speed assembly. The devices are available now. Contact the company for pricing and availability information.

Vishay Siliconix, 2201 Laurelwood Rd., Santa Clara, CA 95054; (800) 554-5565, ext. 53; fax (408) 970-5274; www.vishay.com.

Optical Transceivers Operate At Either 1x Or 2x Fibre Channel Rates
"Rate-agile" optical transceivers suit high-performance Fibre Channel applications. The small form-factor (SFF) 2- by 5-pin and SFF Plugable (SFP) versions operate at either 1x or 2x Fibre Channel rates (1.0625 Gbits/s or 2.125 Gbits/s), depending on the system board in which they are installed. The transceivers are designed for systems created for speed autonegotiation.

The rate-agile capability brings manufacturing flexibility to storage area networking OEMs. The devices enable simplified inventory management. These transceivers also reduce or eliminate the need to maintain separate inventories of fixed-rate transceivers. They adhere to the latest Multi Source Agreement (MSA) standards documents, ensuring interchangeability with all MSA-compatible equipment. The devices address the high demand for increased port density in optical networking infrastructure equipment.

The rate-agile devices use the LC fiber-optic interface. Both versions are now available in production quantities. For pricing and availability information, contact the company.

Stratos Lightwave LLC, 7444 W. Wilson Ave., Chicago, IL 60706-4549; (708) 867-9600; fax (708) 867-0996; Internet: www.stratoslightwave.com.

Direct Incandescent Replacement Lamps Draw 1.0 To 1.7 W
The DécorLED direct incandescent replacement lamps combine indium gallium aluminum phosphide (InGaAIP) and silicon carbide/gallium nitride (SiC/GaN) LED technology. They offer a power draw of 1.0 to 1.7 W and an 11-year LED operating life.

With six sunlight-visible colors from which to choose, these lamps provide architects, entertainment designers, and other lighting professionals with the means to integrate ornamental illumination into maintenance-intensive applications. A molded polycarbonate, UV- and shatter-resistant globe protects the LED cluster from the environment. The lamps are available in all common voltages from 120 V ac/dc to 12/14 V dc. Integrated current-limited resistors and polarity-protection diodes ensure that no circuit modifications are required. Eighteen discrete LEDS are optimally configured either to disperse light in a 270° wide angle or a 30° acute angle, depending on the model. Individual high-intensity LEDs incorporate optical-grade epoxy to produce vivid illumination.

Custom frosted or tinted bulbs, multicolored lamps, and special voltages are available depending on factory approval. G25-, G40A-, S11-, and S14-size bulbs are also available. Solid-state design renders these devices impervious to electrical and mechanical shock, vibration, frequent switching, and environmental extremes.

The DécorLEDs cost from $17.26 to $51.59, depending on the LED technology employed, in quantities of 1000.

LEDtronics Inc., 23105 Kashiwa Ct., Torrance, CA 90505; (800) 579-4875; fax (310) 534-1424; www.ledtronics.com.

2.5-Gbit Transceiver Meets Data-Communication Industry Standards
The small form-factor (SFF) 1G/2G Fibre Channel transceiver is a rate-agile device that meets both the 1.0625- and 2.125-Gbit/s Fibre Channel specifications. This device is available in three versions, with one module compliant with the Gigabit Ethernet standard at 1.25 Gbits/s. A third version operates at the InfiniBand speed of 2.5 Gbits/s.

The SFF transceivers utilize the LC optical connector interface. They occupy half the board space of a standard 1-by-9 SC transceiver. These devices operate on a 3.3-V power supply. Incorporating reliable native oxide 850-nm vertical cavity surface-emitting laser (VCSEL) technology, the transceivers offer serial gigabit transmission over multimode fiber for distances up to 550 m. All of the devices are ac-coupled and compatible with TTL signal detect. They feature an industry-standard 2- by 5-pin configuration and conform to the SFF industry Multisource Agreement (MSA).

EMI fingers are incorporated on all four sides of the housing to optimize EMI performance. An operating-temperature range of 0°C to 70°C is featured. The transceivers may be stored from −40°C to 85°C. In 1000-unit quantities, the devices start at $90.

Molex Inc., 2222 Wellington Ct., Lisle, IL 60532; (630) 969-4550; fax (630) 969-1352; www.molex.com.

TAGS: Components
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