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Photodiodes detect IR signals in light barrier apps

Posted: 02 Nov 2009 ?? ?Print Version ?Bookmark and Share

Keywords:photodiode? IR signal? light barrier application?

VBPW34x, VBP104x photodiodes

Vishay Intertechnology Inc. has released the VBPW34x and VBP104x series of high-speed PIN photodiodes, which comprise eight new devices with optical-sensitive areas of 4.4 and 7.5sq mm and a 65 angle of half sensitivity.

The SMD PIN photodiodes come with gullwing and reverse gullwing packages in clear epoxy and daylight blocking filtered versions. The devices are optimized for smoke detection, detectors in light barriers, and data transmission in a wide range of consumer and industrial applications.

The VBPW34FAS, VBPW34FASR, VBP104FAS and VBP104FASR photodiodes feature a daylight blocking filter matched with IR emitters operating at a wavelength of 870- or 950nm, such as the manufacturer's TSFFxxxx series. The devices are optimized to detect IR signals in light barrier applications covering the range of 780nm to 1050nm, and offer a peak wavelength of 950nm.

For high-speed photo detection, the VBPW34S, VBPW34SR, VBP104S, and VBP104SR clear epoxy devices are suitable for signal detection in the spectral range of 430nm to 1100nm, and offer a peak wavelength of 940nm.

The VBPW34x series photodiodes feature a large optical sensitive area of 7.5sq mm that provides a high output signal of 55?A typical at an illumination condition of 1mW/sq cm at 950nm and 5V reverse bias. The VBP104x series devices offer a smaller optical sensitive area of 4.4sq mm that provides an output signal of 35?A and 30 percent lower capacitance.

The devices' high linearity enables reliable operation over the temperature range of - 40C to +100C. The high-speed photodiodes offer a fast 100ns rise and fall time, low dark current of 2nA, and a wide angle of half sensitivity of 65. The devices' surface-mount packages measure 6.4mm x 3.9mm with a profile of 1.2mm.

The Pb-free photodiodes support Pb-free processing in accordance with RoHS 2002/95/EC and WEEE 2002/96/EC, and are compatible with Pb-free reflow solder assembly.

- Julien Happich
EE Times Europe

For application notes on photodiodes click here.

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