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Phototransistor chip structure schematic circuit

2016-05-07 18:09  
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Phototransistor chip structure schematic circuit
The phototransistor is the same as the conventional semiconductor transistor. It is the semiconductor tube that has the NPN or PNP structure with the semiconductor technology. The structure of it is similar with the semiconductor - diode, the extraction electrode of it is only one or two. The phototransistor structure is as shown in the figure. In order to adapt to the requirements of the photoelectric conversion, the base region area is large, the launch region area is small. The incident light is mainly absorbed by the base region. The same with the phototransistor, the chips of the tube are installed in the metal shell, the light irradiates on the chips through the lens. Figure: The Phototransistor chip structure schematic circuit