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940nm IR emitters tout improved radiant intensity

Posted: 09 Jan 2009 ?? ?Print Version ?Bookmark and Share

Keywords:IR emitter? infrared? intensity radiant?


Vishay Intertechnology Inc. has expanded its optoelectronics portfolio with a family of 940nm surface-mount IR emitters featuring significantly higher radiant intensity over standard emitter technologies.

Available in 1.8mm (T3/4) gullwing (VSMB2020X01), reverse gullwing (VSMB2000X01), PLCC2 (VSMB3940X01), and 0805 (VSMB1940X01) surface-mount packages, the new emitters use a unique die construction that produces a much tighter angular distribution of emitted light and power. All four devices are qualified to the automotive AEC-Q101 standard.

Compared to equivalent devices on the market, the radiant intensity of the PLCC2 VSMB3940X01 is 140 percent higher at 100mA. Its typical forward voltage is a low 1.35V versus 1.5V. Furthermore, its spectral bandwidth is nearly twice as tight, at 25nm.

The VSMB1940X01 and VSMB2020X01 show similar performance improvements with up to 150 percent higher radiant intensity than the next best competing devices. Radiant intensity is 6mW/sr for the VSMB1940X01 and 40mW/sr for the VSMB2020X01.

Both the VSMB1940X01 and VSMB3940X01 have half angles of 60, while the VSMB2020X01 has a half angle of 12.

These new surface-mount emitters, along with the recently introduced 3mm (T1) VSLB3940, have switching times of 15ns, which allows them to be used in industrial light-barrier applications, as well as in IR data and audio transmission applications. For in-car entertainment systems, for example, the emitters can be used to send DVD audio signals by infrared to IR-enabled headphones.

Samples and production quantities of these infrared emitters are available now, with lead times of four to six weeks for large orders.

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