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phototransistor

   Also found in: Dictionary/thesaurus, Acronyms, Wikipedia, Hutchinson 0.02 sec.

phototransistor

A transistor that uses light rather than electricity to cause an electrical current to flow from one side to the other. It is used in a variety of sensors that detect the presence of light. Phototransistors combine a photodiode and transistor together to generate more output current than a photodiode by itself. See photoelectric, photodiode and transistor.


phototransistor [¦fōd·ō·tran′zis·tər]
(electronics)
A junction transistor that may have only collector and emitter leads or also a base lead, with the base exposed to light through a tiny lens in the housing; collector current increases with light intensity, as a result of amplification of base current by the transistor structure.


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It contains an infrared light-emitting diode as a light source and a phototransistor as a light detector.
Targeted for high-speed non-contact and fast speed switching industrial and office automation applications, Avago's APDS-91xx series of low-cost integrated reflective sensors incorporates an infrared LED and a phototransistor in a single integrated module that has been designed to operate in low temperature environments.
3 V and 5 V digital optocouplers, 100 KBaud to 50 MBaud digital logic gate optocouplers, 100 MBd magnetic isolators, gate drive and current sense optocouplers, solid state relays (MOSFET), phototransistors and analog and high-performance hermetic optocouplers.
 
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