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QEC121 series datasheets. Manufacturer: Fairchild Semiconductor.

QEC121PLASTIC INFRARED LIGHT EMITTING DIODEDatasheet*)
QEC122C4R0AlGaAs Infrared Emitting Diode in 2-pin T-1, 3mm Diode package.Datasheet*)
QEC122C6R0AlGaAs Infrared Emitting Diode in 2-pin T-1, 3mm Diode package.Datasheet*)
There are other manufacturers for this components. For more information please check
QEC121 (QT)
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