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Phototransistors are semiconductor devices that amplify the current generated by the photovoltaic effect using junctions; these optical components offer similar performance to the photodiode but are much more sensitive to light. Specifically, a phototransistor is a semiconductor device that can detect light levels and alter the current flow between the emitter and collector according to the amount of light received.


  • High uniformity of silicon cells
  • High temperature range
  • High transparency resin
  • High gain
  • Designed to meet industrial specifications
  • Reference holes for precise mounting
  • Reference dots for very precise mounting

Design and Specifications

Model Active area (mm2)  Element Dimension (mm) Wavelenght (nm)
OIT11C 0.09 6 6.55x5.60 750
OIT12C-S 0.125 9 6.55x5.60 750
OIT15C-S 0.125 6 6.55x5.60 750
OIT25C 0.09 6 6.62x7.62 750
OIT29 0.09 3 6.00x5.80 750
OIT6C 0.09 12 7.00x12.20 750
OIT7C 0.09 16 7.00x12.20 750
OIT9C 0.09 4 5.20x5.25 750

What are phototransistors used for, and what are their applications?

Phototransistors are used in a wide variety of fields, including robotics through rotary and linear encoders used on cobots.
Phototransistor arrays are used in rotary and linear encoders, optical barriers, presence sensors, and optical and X-ray sorting machines.
Our phototransistor arrays are available in SMD plastic or ceramic, Metal TO, and Chip-On-Board (COB) packages.
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