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H21A4 series datasheets. Manufacturer: QT.

H21A4Phototransistor Optical Interrupter Switche with Tabs/Gap Width=3.15 mmDatasheet*)
H21A5Phototransistor Optical Interrupter Switche with Tabs/Gap Width=3.15 mmDatasheet*)
H21A6Phototransistor Optical Interrupter Switche with Tabs/Gap Width=3.15 mmDatasheet*)
There are other manufacturers for this components. For more information please check
H21A4 (Fairchild Semiconductor)
H21A4 (GESS)
Click here to download H21A4 Datasheet
Click here to download Datasheet
*)

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