What is the difference between a phototransistor and a photodiode?

A photodiode is a semiconductor device while phototransistor use as the transistor. Photodiode which can convert the light energy into an electrical current, whereas the phototransistor is for the conversion of light energy into an electrical current.

What are the advantages of phototransistor?

Advantages of Phototransistor Phototransistors produce a higher current than photodiodes. Phototransistors are relatively inexpensive, simple, and small enough to fit several of them onto a single integrated computer chip. Phototransistors are very fast and are capable of providing nearly instantaneous output.

What is the reason phototransistor?

Q6: What is the reason phototransistor produces more current than a photodiode? A wider spectrum is accepted by the phototransistor than the photodiode. The current produced by photons is amplified by the hfe of the transistor. The phototransistor can heavily doped than the photodiode.

What is the difference between photodiode and Photoresistor?

No, Photoresistor is sensitive to incident light from anywhere in front of it. Yes, Photodiode is sensitive to incident light from particular direction and insensitive from other directions. No change in resistance for light intensity regardless of applied voltage i.e. it remains same.

What is the advantage of phototransistor over photodiode?

Faster Response: The response time of phototransistor is more than that of the photodiode, this provides the advantage of using the phototransistor in our circuit. Less Noise interference: The major drawback of photodiodes especially that of avalanche photodiodes is that it is not immune to noise interference.

What is used to form phototransistor?

Which of the following are used to form photo transistors? Explanation: Photo transistors are formed by placing two photo diodes back to back.

What are the advantages and disadvantages of phototransistor?

➨Phototransistor is more responsive to light than photoresistor. ➨Phototransistors are cheaper. ➨Phototransistors can produce a voltage which can be used in conjunction with microcontroller housing ADC. ➨Output current of phototransistor is easily obtainable.

What are the advantages of phototransistor over photodiode?

What is the characteristics of a phototransistor?

Characteristics of Phototransistor As phototransistors are basically Bipolar NPN Transistors with large base – collector junction, the characteristics of a Phototransistor are similar to that of a simple BJT. Phototransistors are available as two-leaded or three-leaded devices.

What is a phototransistor and how does it work?

The phototransistor is a semiconductor device that is able to sense light levels and alter the current flowing between emitter and collector according to the level of light it receives.

How did the current through the phototransistor relate to the light level?

That current, which is labeled I in the circuit below, also has to pass through the resistor. When more current passes through a resistor, the voltage across it will be higher. So, a smaller resistor in series with the phototransistor makes the circuit less sensitive to light.

What does a phototransistor measure?