Description
These devices have a compact construction where the emitting-light sources and the detectors are located face-to-face on the same optical axis. The operating wavelength is 950 nm.
The detector consists of a phototransistor. Due to the special construction, the depth of the gap is equal to a package height of 4 mm.

Features
● Gap 2.8 mm
● Package height: TCST5123: 4.0 mm
● Plastic polycarbonate housing
● Subminiature construction
● Snap-in mounting mechanisms
● Current Transfer Ratio (CTR) of typical 20%

Applications
● Position sensor for shaft encoder,
● Detection of opaque material such as paper,
   IBM cards, magnetic tapes etc.,
● Limit switch for mechanical motions in VCR,
● General purpose – wherever the space is limited