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photodiode vs photoresistor vs phototransistor

photodiode vs photoresistor vs phototransistor

The electron moves towards the cathode, and the hole moves toward the anode. • Photodiodes are used as fast counters and used in light meters to measure the light energy.

They are very useful for various applications such as fire alarms, counting systems and automatic control systems. Here it acts as variable resistor based on Saturation voltage of phototransistor is the voltage drop between collector and emitter, which seldom exceeds Er ähnelt somit einer Photodiode mit angeschlossenem Verstärkertransistor. There are various circuit symbols of the photoresistor. light intensity.

The photodiode is used in switching circuit, and in electronics devices like a smoke detector, compact disc players, in light meter, etc.

Hence photodiode is used for precise measurement of light over wide range. • It is a transistor controlled by exposure to light. Hence photodiode is used for battery powered devices requiring less If used in this way,connection to base terminal is not needed.

The base of transistor (or gate in FET) responds to light and controls the flow of current between the leads. The resistance of a photoresistor decreases with increasing incident Some other differences between the photodiode and phototransistor are shown in the comparison chart. The structures of these devices are similar to their electrical analog in terms of doping. more comparison between photodiode and phototransistor. The base side of the phototransistor captures the light from the source. whereas the phototransistor is used for detecting the light. It is similar to photodiode controlling an FDMA vs TDMA vs CDMA It covers advantages and disadvantages of photodiode and phototransistor. Whereas, the phototransistor uses the transistor for the conversion of light energy into an electrical current. It can resamble as photodiode giving current amplification due to transistor action. • A photodiode is operated in reverse bias in which leakage current increases in proportion to the amount The arrow shows the light energy incident on their base surface. Detection of light is a basic need for everything like plants, animals and even devices. Both the photodiode and phototransistor work on the principle of the inner photoelectric effect. This convex acts as a lens which focuses light on the transistor. Introduction:

No change in resistance for light intensity regardless of applied voltage i.e. • It is a disc shaped component with two leads as shown in the figure-1. Photocell changes light signals into electrical signals. • Its body is encased in resin or plastic or encased in a metal shell with window in it. The phototransistor amplifies the input light, and the output current is obtained from the collector of the transistor. of light falling on the junction. • In the absence of light, bipolar phototransistor permits leakage between collector and emitter of 100 nA or less. ➨Refer advantages and disadvantages of Photodiode >> This generated leakage current is later amplified. The transistor amplifies the base current which causes because of the absorption of light and hence the large output current is obtained through the collector terminal.The time response of the photodiode is much faster than the phototransistor, and hence it is used in the circuit where fluctuation occurs. It is a type of transistor which converts the light energy into an electrical energy, Forward biasing (emitter is more negative as compared to the collector. Difference between TDD and FDD It can be used to generate variable voltage. Effective resistance varies less with temperature. • It can be either bipolar transistor or field effect transistor (FET). ➨Photodiode has linear response over much wider range of light than phototransistor. Device researchers have worked on techniques for light detection and developed devices that offer excellent performance. ➨A phototransistor is about one hundred times more sensitive than a photodiode. Photocell changes light signals into electrical signals. Your email address will not be published. It covers advantages and disadvantages of photoresistor and phototransistor. The magnitude of current depends on the intensity of the light incident on it. This effect is similar to photo voltaic cell. Ein Foto- bzw. The current constitutes in the diode are directly proportional to the intensity of light absorb it.

• It is a transistor controlled by exposure to light. • Its body is encased in resin or plastic or encased in a metal shell with window in it. Resistance varies more with temperature. One of the major difference between the photodiode and the phototransistor is that the photodiode uses PN-junction diode which converts the light energy into an electric current, whereas the phototransistor uses the ordinary transistor (NPN transistor) for the conversion of light into current. When the light incident at the base of an NPN transistor the base current develops. This is result of light energy which breaks the bonds in the crystal lattice of the semiconductor producing

In darkness, resistance as high as 10 MOhms and in bright light, resistance as low as 500 Ohms The photodiode is a semiconductor device which converts the light’s energy into an electrical current. from smaller one (5 mm in diameter) to larger one (25 mm in diameter). • Examples: Optek/TT Electronics OP506A, Vishay TEKT5400S, Vishay BPW17N etc.

it remains same. FDM vs TDM Difference between SC-FDMA and OFDM As we know both are photocells. One of the applications of photoresistor is shown in the following circuit. light intensity falling on it. But phototransistor is more sensitive as compared to photodiode because of the use of the transistor. transparent window through which light can fall inside. This page compares photoresistor vs phototransistor and mentions difference between photoresistor and phototransistor. Phototransistors and photodiodes are analogs of regular transistors and diodes.

Difference between SISO and MIMO Moreover photodiode consumes less Your email address will not be published. Smoke detector, compact disc players, invisible light receiver, in laser etc. The photodiode is less sensitive as compared to the phototransistor because the phototransistor produces the large output current. The working of the photodiode depends on the intensity of light strike on it.

Following table mentions difference between photoresistor and phototransistor. ). The photodiode works in both the forward as well as reversed biased whereas the phototransistor work in forward biasing.The emitter of the phototransistor is negative as compared to the collector region. The photodiode is used in solar power plant, in a light meter, etc. Because of this hole pair, the depletion layer of the diode decreases and electron starts moving from the emitter to the collector region. • It can be either bipolar transistor or field effect transistor (FET). Light energy can be infrared or ultraviolet radiations. Introduction: As we know both are photocells. • Photodiode consists of a normal p-n junction housed in a small enclosure which a • When the light falls on the surface of the disc, resistance between the leads diminish (or reduce). power consumption. ➨Dark current of phototransistor is much higher than photodiode. It covers advantages and disadvantages of photodiode and phototransistor. For the small amount of light energy, the transistor amplifies the large collector current. Yes, Phototransistor is sensitive to incident light from particular direction and Introduction: • It is a passive component which varies its resistance in response to the light. The collector region of the phototransistor is large as compared to the ordinary transistor because it is made up of heavy diffuse semiconductor material. difference between OFDM and OFDMA For generating solar power, for detecting ultraviolet or infrared rays, for measuring light etc. Hence many of the phototransistors do not have a base lead.

Few of these devices are moulded in transparent plastic cases with convex. Light is an electromagnetic radiation with a much shorter wavelength and higher frequency than radio waves. Photodiodes have similar structure as a regular diode, where a p-n, p-i-n, or similar doping profile is used in the device. No, Photoresistor is sensitive to incident light from anywhere in front of it. Hexadecimal to Decimal & Decimal to Hexadecimal Conversion Methods, Two Wattmeter Method of Power Measurement, Difference Between Static and Kinetic Friction, Difference Between Ductility and Malleability, Difference Between Physical and Chemical Change, Difference Between Alpha, Beta and Gamma Particles, Difference Between Electrolytes and Nonelectrolytes, Difference Between Electromagnetic Wave and Matter Wave, Difference Between Kinetics and Kinematics, Difference Between Synchronous and Asynchronous Counter, Difference Between Analog and Digital Signals. • Phototransistor has two leads which connect internally with its collector and emitter (or source and drain in FET).

0.5V. It is a quantum mechanical phenomena and comes in discrete particles called Photons.A light sensor is a passive s…

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