Also, this is capable of producing both current and voltage. The phototransistor acts in the same way as the photoresistor commonly known as LDR i.e. Phototransistors are capable of converting light energy into electrical energy. Due to which this has a huge advantage and due to its low cost, phototransistors are used in many applications. This is done by light instead of electric current. Phototransistors are widely used to detect light pulses and convert them into digital electrical signals. When light falls at a junction a reverse current flows which are proportional to the luminance. Difference Between Photodiode and Phototransistor:ĭefinition: A phototransistor is an electronic switching and current amplification component that relies on exposure to light for operation.
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