H21A4 series datasheets. Manufacturer: GESS.

H21A4 1mm aperture.Photon coupled interrupter module. in 4-pin - package. Operational temperature range from -55°C to 100°C. Datasheet*) H21A5 1mm apertur. Photon coupled interrupter module. in 4-pin - package. Operational temperature range from -55°C to 100°C. Datasheet*) H21A6 1mm aperture. Photon coupled interrupter module. in 4-pin - package. Operational temperature range from -55°C to 100°C. Datasheet*) There are other manufacturers for this components. For more information please check H21A4 (Fairchild Semiconductor) H21A4 (QT)

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