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IR emitter offers 'lowest' forward voltage

Posted: 25 Nov 2008     Print Version  Bookmark and Share

Keywords:infrared emitter  forward voltage  radiant intensity 


Vishay Intertechnology Inc. claims its new 870nm SMD infrared emitter offers the lowest forward voltage and highest radiant intensity of any such device in the PLCC2 package.

The new VSMF4720 combines a wide viewing angle of ±60° with a high radiant intensity of 16mW/sr at 100mA, 150 per cent greater than any other available emitter in the PLCC2. The combination of a wide viewing angle, high power and high speed makes the VSMF4720 suitable for data transmission applications such as IR toll collect and wireless audio transmission. Suitable for high-pulse-current operation, the device offers high power output up to 1A and 50-mW optical power at 100mA.

Given the VSMF4720's low and stable forward voltage of 1.45V at 100mA and 2.1V at 1A, the device provides the basis for very uniform operation performance, especially in a series circuit layout. Featuring GaAlAs double hetero technology, the emitter offers switching times of 15ns, meeting the requirements for high-modulation operation of 24MHz and supporting data transmission rates of up to 16Mbps.

The VSMF4720 emitter in the 3.5mm by 2.8mm by 1.75mm SMD PLCC2 package complements the recently introduced TSFF5510 5mm leaded devices, allowing customers to choose the package that is best for their assembly method. The VSMF4720 is compatible with Pb-free reflow soldering and complies with WEEE 2002/96/EC and RoHS 2002/95/EC.

Samples and production quantities of the new VSMF4720 infrared emitter are available now, with lead times of four weeks for large orders.

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