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IR PHOTOSENSOR

Photonics Spectra
Nov 2003
Fairchild ImagingRequest Info
 
The QSB34 photosensor has been introduced by Fairchild Semiconductor. The PIN photodiode device has a surface area of 3 X 3 mm and a reception angle of 120°. Its packaging creates an integral, transparent daylight filter optimized for reception of wavelengths from 880 to 940 nm. Even with the filter, the flux response is typically 0.4 A/W at 900 nm. With 25-pF capacitance and small series resistance, the photosensor has 20-ns rise and fall times and provides a dynamic signal range of 60 dB. Gull-wing and reversed X-bend mounting configurations are available respectively, for topside or underboard mounting, with a profile of only 1.25 mm from the mounting surface.


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GLOSSARY
PIN photodiode
A diode with a large intrinsic region sandwiched between P-doped and N-doped semiconducting regions. Photons absorbed in this region create electron-hole pairs that are then separated by an electric field, thus generating an electric current in a load circuit.
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