H21A1 series datasheets. Manufacturer: QT.

H21A1 Phototransistor Optical Interrupter Switche with Tabs/Gap Width=3.15 mm Datasheet*) H21A2 Phototransistor Optical Interrupter Switche with Tabs/Gap Width=3.15 mm Datasheet*) H21A3 Phototransistor Optical Interrupter Switche with Tabs/Gap Width=3.15 mm Datasheet*) There are other manufacturers for this components. For more information please check H21A1 (Fairchild Semiconductor) H21A1 (GESS)

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