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phototransistor

   Also found in: Acronyms, Encyclopedia, Wikipedia, Hutchinson 0.07 sec.
pho·to·tran·sis·tor  (ft-trn-zstr)
n.
A transistor having highly photosensitive electrical characteristics.
phototransistor  (ft-trn-zstr)
A transistor that regulates current or switches it on and off based on the intensity of the light it is exposed to rather than an external electric signal. Phototransistors are used in many electric-eye applications, including digital cameras, in which millions of tiny phototransistors map an image into an array of electrical signals. See also photoelectric effect.
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