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A transistor with two arrows pointing towards it.
Also known as: Photo transistor, Light-sensitive transistor, Transistor with arrows in
Arrows pointing at a device mean light falling on it; arrows pointing away mean light emitted. A phototransistor is a transistor whose base current comes from incident light, which gives it far more gain than a photodiode at the cost of speed.
Denotes a phototransistor: a bipolar transistor whose base current is generated by incident light.
Contexts: Electrical equipment
Uses inward-pointing arrows to indicate incident light, the same convention that outward arrows use for emission.
Contexts: Electrical equipment
Gives greater sensitivity than a photodiode through transistor gain, at the cost of a slower response.
Contexts: Electrical equipment
A bipolar transistor symbol in a circle with two short parallel arrows pointing inwards towards the base region.