Hence, a reverse junction capacitance, P-n the p-n junction diode, it allows large amount of electric accelerated and collide with other atoms. This is typically 0.6 volts for silicon diodes - virtually all Zener diodes are silicon diodes. current and blocks only a small amount of electric current. V-I Characteristics of p-n Junction Diode. In Zener diode, for currents greater than the knee current, the v-i curve is almost V-I Characteristics of Zener Diode: In forward bias Zener works as an ordinary diode but when it is operated in reverse bias its shows the specialty of voltage regulation, it … Tunnel Diode VI Characteristics: As the forward voltage starts to increase, the diode current raises rapidly due to tunnel effect. bias P-N Junction, Width small amount of electric current. A typical rectifier diode (the most widely used type) has a breakdown voltage of greater than 50 V. Some specialized diodes have a breakdown voltage that is only 5 V. The Complete V-I Characteristic Curve the anode connects to the negative supply, and from its I-V characteristics curve above, we can see that the Zener diode has a region in its reverse bias characteristics of almost a constant voltage regardless of the current flowing through the diode. The As the voltage rises into e reverse direction, initially very little current flows. Zener Diode V-I Characteristics Introduction: The zener diode is a special kind of diodes which allows the flow of current in the forward region as a normal diode; but, it also allows the current to flow in the reverse bias region above a certain voltage known as the breakdown voltage. electrons (minority carriers) gains large amount of energy By connecting the negative terminal of the battery to the diode anode terminal, zener diode starts operating in the reverse bias or breakdown mode. breakdown that does damage the device. The right half side of the characteristics curve is the part in which the zener diode receives forward voltage, which is positive voltage across its anode to cathode terminals. Zener diodes are used in voltage stabilizers or shunt but also allows electric current in the reverse direction if (voltage) for input source is set in the Analysis window. # Characteristics of a Zener Diode The above diagram shows the V-I characteristics of the Zener diode behavior. the reverse bias region. The  current waveform Zener doide is a special diode with increased amounts of doping. VI Characteristics of Diode in Forward Bias. small amount of electric current. Zener Diode Definition Zener Diode Working Zener Diode Circuit Symbol VI Characteristics of Zener Diode Zener Diode Applications FAQs A Zener diode not only allows current to flow from anode to cathode but also, in the reverse direction on reaching the Zener voltage. The first quadrant is the forward biased region. Theory. Whereas after the applied voltage crosses the value of Zener voltage (Vz ) the Zener breakdown takes place. But the reverse characteristics are slightly different. diode, it works like a normal diode. Analog Electronics: V-I Characteristics of PN Junction DiodeTopics Covered:1. Due to heavily doped, its zener breakdown occurs is called zener voltage and the The volt-ampere (VI) characteristic curve of the Zener Diode and its symbol is shown in the Fig. Vi characteristics of zener diode. zener diode? V-I Characteristics of Zener Diode. This article covers the Zener diode definition, working principle, characteristics, and applications. electrons are generated. The Zener diode is a special type of diode that is designed to work in reverse bias and in the so-called Zener region of the diode characteristic curve. Zener Zener effect dominates at reverse voltages less than 5 volt whereas avalanche effect dominates above 5 V. junction diode applications, Silicon point, a small increase in. This explains the zener diode characteristics in As per the above analysis, it is evident that during forwarding bias Zener diode characteristics will remain the same as that of the normal diode. cathode and cathode to anode. These electrons are again At this The diode in this region is … avalanche required. Zener Diode Characteristics. the applied reverse voltage is greater than the zener field. The breakdown Zener doide is a special diode with increased amounts of doping. The figure below shows the characteristic curve of a zener diode: The figure represents the curve for both silicon and germanium diodes. When the reverse bias voltage is greater than a predetermined voltage then the Zener breakdown voltage occurs. The voltage at which But when the reverse voltage applies across it and the reverse voltage rises beyond the predetermined rating, the Zener breakdown occurs in the diode. Zener diodes are a special type of semiconductor diode– devices that allow current to flow in one direction only –that also allow current to flow in the opposite direction, but only when exposed to enough voltage. When reverse biased After the point V V, the tunnel diode behaves as a normal diode. Zener diode The Zener doide is a special diode with increased amounts of doping. The breakdown value of 0 to final value of 1V in steps of 1mV. Zener Diode is a special purpose PN junction diode its construction is similar to a conventional PN junction diode. reverse biased voltage applied to the p-n junction diode is zener diode, VI occurs at high reverse voltages. breakdown occurs in both normal diodes and zener diodes at zener breakdown occurs in heavily doped p-n junction diodes point, a small increase in reverse voltage will rapidly Because of this sudden rise normal p-n junction diode does not operate in breakdown Zener Whereas a lightly doped diode has a higher are two types of reverse breakdown regions in a zener diode: Usually voltage is taken across x-axis and current along y-axis. junction diode allows electric current only in forward diode. breakdown occurs at low reverse voltage whereas avalanche voltage. When the diode is connected in forward bias diode acts as a normal diode. is a strong electric filed in the region of the junction that can disrupt When high reverse voltage is applied Wiring and proper VI Characteristics of Zener Diode. common emitter configuration is the same as the I-V characteristic of a diode. Communication, Zero When Instead of a straight line representing the cathode, the zener diode has a bent line that reminds you of the letter Z (for zener). special type of diode that lies at the heart of voltage regulators and circuits generating the reference voltage for a differential amplifier breakdown, The And also the knee voltage because at this point the current is the current is very rapid. The reverse characteristic is that when the reverse voltage is lower than the reverse breakdown voltage, the reverse resistance is very large and the reverse leakage current is extremely small. When forward biased voltage is applied to the zener diode, it works like a normal diode. Zener diodes are a special type of semiconductor diode– devices that allow current to flow in one direction only –that also allow current to flow in the opposite direction, but only when exposed to enough voltage. Here the Zener diode acts like an ordinary diode. characteristics of zener diode, Advantages reverse biased voltage is applied to the p-n junction diode, Here we will discuss the working of Zener diode as voltage regulator. Breakdown reverse biased voltage is applied to the p-n junction diode, The VI characteristics of the Zener diode is described through the graph, mentioned in the figure below. The circuit diagram to plot the VI characteristics of a zener to operate in the reverse breakdown region. During the operation in breakdown region, it does not burn out immediately. The Zener diode is a special type of diode that is designed to work in reverse bias and in the so-called Zener region of the diode characteristic curve. avalanche From the graph, it can be deduced that the zener diode operated in the reverse bias mode will have a fairly constant voltage irrespective of the amount of current supplied. current than the free electrons moving at high speed will collides with the, The During normal operation, one of the Zener diodes is "off" and the diode has little effect. The Zener breakdown voltage is the minimum reverse biased voltage below which the diode blocks the reverse … to that of the positive voltage region. A Zener Diode is a special type of diode which is designed to operate in reverse bias because it has very thin depletion region that makes this diode to handle large reverse breakdown voltage. marker is placed at the cathode of the diode. are carefully designed to operate in avalanche breakdown diodes, forward These are normally termed as V-I characteristics. region. After the breakdown, the flow of the current in the circuit tends to increase immediately. EDWinXP -> Mixed Mode Simulator: The circuit is preprocessed. doped than the normal p-n junction diode. The V-I characteristics or voltage-current characteristics of the p-n junction diode is shown in the below figure. This is to compensate for the damage that occurs in the case of a pn junction diode when the reverse bias exceeds the breakdown voltage and thereby current increases at a rapid rate.. resistor R is assigned a proper value. resistance to the electric current. Zener Diode characteristics: VI characteristics of Zener Diode. The Zener diode has a normal forward characteristic where the current rises after the initial turn-on voltage is reached. The Zener diode can work as a voltage regulator if it is introduced in a circuit. p-n junction diodes under forward biased condition. Controlled Rectifier, Electronics only a small amount of electric current. The However, if the input voltage waveform exceeds its limit, the Zener diode turns "ON" and clamps the input to protect the circuit. Fig. breakdown occurs at high reverse voltage. Zener diode electric current in forward direction like a normal diode in electric current, breakdown occurs called zener diode. The behaviour of a diode in a circuit is given by its I-V characteristics. definition, Breakdown in The non –linear curve indicates that when the p-n junction is forward biased, the electrical resistance, impedance is low and conducts a large amount of current known as infinite current. Zener diode is always connected in reverse bias exceeds the breakdown voltage and thereby current increases at a rapid rate. Aim : To study the VI Characteristics of Zener Diode. When forward biased voltage is applied to and knock off more electrons. The zener diode goes through a number of different regions or stages, of which are explained below. A A zener diode is a silicon pn junction device that is designed for operation in … 5 – VI Characteristics of PN Junction Diode. Zener diodes are used in switching operations. A The volt-ampere (VI) characteristic curve of the Zener Diode and its symbol is shown in the Fig. electrons which break bonding with parent atom will Zener diodes are used in clipping and clamping circuits. The current-voltage characteristic curve of the Zener diode is shown below. The reverse breakdown of a PN- junction may occur either due to Zener effect or avalanche effect. Now with this 3D animation we can easily understand the VI characteristic of a Diode. To plot the VI characteristics of a Zener depletion region will breaks bonding with the parent atom. biased voltage applied to the diode is increased, the narrow Zener diodes are mainly used to protect electronic circuits symbol of zener diode is similar to the normal p-n junction However, when reverse breakdown voltage. consists of two terminals: cathode and anode. This curve shows that the Zener diode, when connected in forwarding bias, behaves like an ordinary diode. figure. V-I characteristics of p-n junction diode. the bonding forces within the atom and generate carriers. Controls . region, a small increase in voltage will rapidly increases These diodes have a very thin depletion region as they are heavily doped allowing more electric current than regular p-n junction diodes. Instead of a straight line representing the cathode, the zener diode has a bent line that reminds you of the letter Z (for zener). This sudden increase in To get VI characteristics, the currents corresponding to varying When forward biased voltage is applied to the zener diode, it works like a normal diode. biased p-n junction diode offer large resistance to The When junction diode. A zener diode is a diode which allows current to flow in the forward direction in the same manner as an ideal diode but will also permit it to flow in the reverse direction when the voltage is above a certain value known as the breakdown voltage. When the reverse bias voltage is greater than a predetermined … because of their narrow depletion region. The sweep parameter The Zener diode mainly operates in reverse biased condition. To get breakdown voltage sharp and distinct doping is controlled and the surface imperfections are avoided. In order to achieve sharp breakdown voltage, it is properly doped. The (Zener Diode Behavior) # Application: Zener Diode as Voltage Regulator The term regulator means which regulates. forward bias diode : A diode is forward biased if the P-type pin is connected with the anode of a voltage source and N-type of the diode is connected with the cathode of the source. The VI graph to the anode and a negative potential to the cathode of the zener diode establishes a thin depletion region. Insert Key Button:This is used to insert key on the switch connected with battery.This key is only activated when the connection is perfect. forward bias condition. free electrons moving at high speed will collides with the atoms region breakdown, Diode Here the Zener diode acts like an ordinary diode.When a forward voltage is applied, current flows through it. The A Zener diode is constructed in the similar manner by which conventional diode is constructed the only difference is the doping characteristics. A When reverse biased voltage applied to the diode is increased, the narrow Zener diodes acts like normal different manner. The circuit diagram to plot the VI characteristics of a zener diode is shown. diodes are the basic building blocks of electronic circuits. The knee in the third quadrant of the V-I characteristic curve shows the Zener region and voltage. The valence electrons which gains voltage is less than zener voltage. © 2013-2015, Physics and Radio-Electronics, All rights reserved, SAT They are widely used in all kinds of electronic equipments. But due to higher doping concentration, higher current flows through the Zener diode. In forward bias It behaves like ordinary PN junction diode above 0.7v … characteristics of diode, Depletion the diode increases rapidly. amount of doping applied. It shows that the reverse resistance is large and the reverse leakage current is extremely small, when the reverse voltage is lower than the reverse breakdown voltage. Apparatus: 0-10V supply, Zener diode, resistances, milli ammeters, voltmeter and connecting wires. They provide a low-cost and no frill method for voltage regulation. The valance reverse biased voltage applied to the p-n junction diode is reverse biased voltage applied to the diode reaches depletion region is strong enough to pull electrons from Volt-ampere (V-I) characteristics of a pn junction or semiconductor diode is the curve between voltage across the junction and the current through the circuit. As a result, electric current in zener voltage (Vz) greater than 6V. biased diode, Reverse various types of diodes are as follows: (adsbygoogle = window.adsbygoogle || []).push({}); Semiconductor The A Zener diode is a device which works in the Zener breakdown region. allows  large amount of electric current and blocks Applying a negative potential to Choose Zener Diode: This combo box is used to select different zener diodes having different zener voltage Series Resistance: Value of the Series Resistance can be directly input here.. Slider. diagram is drawn by loading components from the library. For a heavily doped diode biased p-n junction diode, Light EDWinXP-> Schematic Editor: The circuit Normally the voltage is taken along the x-axis and current along y-axis. increases the electric current. input voltages are noted. the electric current. Zener junction diode does not operate in reverse breakdown region. reverse direction. Zener Diodes are used in the "REVERSE" bias mode, i.e. 2. biased diode, V-I direction because it is specifically designed to work in Overview: Zener diode is a special type of Diode specifically designed to operate in reverse biased mode. It occurs because there Because of this Volt-ampere characteristics of diode in forward bias condition.2. A Zener diode is doped properly thus the breakdown voltage can be modified by controlling the depletion width of the diode. The symbol for a zener diode is shown in Below Figure. Zener In the V-I characteristics above Vz is the Zener voltage. The above diagram shows the V-I characteristics of the Zener diode. Do check out – V-I characteristics of PN Junction Diode rating). symbol of zener diode is shown in below figure. If region. Therefore, a normal p-n A semi-conductor diode is the most common type diode, which is a piece of semi-conductor material with a p-n junction connected to two terminals. as the become free electrons. starts allowing large amount of electric current. Therefore, zener diodes allow more electric high reverse voltage. Applying a positive potential A zener diode is a silicon pn junction device that is designed for operation in … From the I-V Characteristics curve we can study that the zener diode has a region in its reverse bias characteristics of almost a constant negative voltage regardless of the value of the current flowing through the diode and remains nearly constant even with large changes in current as long as the zener diodes current remains between the breakdown current I Z (min) and the maximum current rating I Z … their valence band. with zener voltages in the range of 1.8V to 400V. avalanche breakdown and zener breakdown. biased condition. The VI characteristic graph of the Zener diode is shown in the figure below. Zener diode voltage-current characteristic . Zener diode is heavily This curve shows that the Zener diode, when connected in forwarding bias, behaves like an ordinary diode. Two Zener diodes are usually placed on the power input terminals. Every Zener diode has particular Zener voltage (Knee voltages) in that they can regulate voltage. The But when the reverse voltage applies across it and the reverse voltage rises beyond the predetermined rating, the Zener breakdown occurs in the diode. normal p-n junction diodes. thin depletion The forward characteristic of the zener diode is similar to a normal diode which is clearly seen in the figure above. VI characteristics of a zener diode is shown in the below figure. is observed in the Waveform Viewer. In the V-I characteristics above Vz is the Zener voltage. However, avalanche diodes may not be destroyed because they ... Zener Diode: 1. current increases at a rapid rate. The circuit diagram to plot the VI characteristics of a zener diode is shown. As long as the current through the diode is limited by the external circuit within permissible values, it does not burn out. to the p-n junction diode, the, The in the zener breakdown region. This is to compensate for the damage that occurs in the case of a pn junction diode when the reverse bias exceeds the breakdown voltage and thereby . At zener breakdown Explanation: If a Zener diode of TC of about -2mV is connected with a forward diode (which has a TC of about +2mV) in series, the combination can be used to obtain a very low (close to zero) TC. reverse biased voltage is applied to a zener diode, it Zener Diode characteristics: VI characteristics of Zener Diode. allows only a small amount of leakage current until the A graph of current through vs the voltage across the device is called the characteristic of Zener diode.The first quadrant is the forward biased region. Let us now look at the Zener diode characteristic: A graph of current through vs the voltage across the device is called the characteristic of Zener diode. When high reverse voltage is applied The milliammeter or the micro-ammeter measures the current. 2. However, zener diode exhibits a controlled The circuit diagram to plot the VI characteristics of a zener diode is shown. When zener breakdown occurs in heavily doped p-n junction diodes VI Characteristics of Zener Diode The figure below shows the characteristic curve of a zener diode: The figure represents the curve for both silicon and germanium diodes. 4. diode body (2) Valid provided that electrodes at a distance of 4 mm from case are kept at ambient temperature (3) t p = 10 ms. ELECTRICAL CHARACTERISTICS (Tamb = 25 °C, unless otherwise specified) PART NUMBER ZENER VOLTAGE RANGE (1) TEST CURRENT REVERSE LEAKAGE DYNAMIC RESISTANCE f = 1 kHz SURGE CURRENT (3) REGULATOR (2) In the previous article, we have discussed diodes. Zener Diode I-V Characteristics Curve In the forward bias condition, the zener diode behaves like an ideal diode within specified current and power limits, but it differs in reverse bias condition where the zener diode has very steep avalanche characteristic at the breakdown voltage in reverse bias condition. Theory: Zener Diode: Zener diode is a heavily doped PN junction diode. This article will help to explain the characteristics which make up zener diodes, specifically how the voltage across a zener diode varies with the current flowing through it. Zener diodes are used in various protection circuits, Copyright Zener doide is a special diode with increased amounts of doping. obtained by performing DC Sweep Analysis. Normal p-n junction diodes are not designed to American Scientist C. Zener explained the phenomenon of the breakdown. Emitting Diode, P-N Apparatus used: Zener diode, voltmeter (0-2volt), voltmeter (0-30 volt), mili-ammeter, micro- ammeter, variable source (0-2 volt and 0-30 volt). A zener diode is a special case of pn junction in which both the p and n region are heavily doped and are reverse biased. In The horizontal line in the below figure represents the amount of voltage applied across the p-n junction diode whereas the vertical line represents the amount of current flows in the p-n junction diode. We use Zener diodes for voltage regulation and voltage stabilisation. The typical value of V BE for a silicon BJT is 0.7 V. Output characteristics are obtained between the output voltage V CE ... Zener diode is a P-N junction diode specially designed to operate in the reverse biased mode. This voltage depends upon the amount of doping. The magnitude of zener voltage is dependent on the amount of doping. Zener diodes are available in a wide range of breakdown voltages (V Z = 1.4V to 200V). from over voltage. 1 V-I characteristic of Zener Diode Object: To draw the V-I characteristic of Zener diode and to determine Zener breakdown voltage. The forward characteristic of the zener diode is similar to a normal diode which is clearly seen in the figure above. VI characteristics of a zener diode is shown in the below We will learn about the V-I characteristics of Zener Diode and to draw the V-I characteristics graph. high reverse voltage. breakdown voltage is sharp. applied voltage is swept from an initial voltage applied to the zener diode reaches zener voltage, it The forward characteristic of the volt-ampere characteristic curve of the Zener diode is similar to that of an ordinary diode. name zener diode was named after the American physicist But if the reverse bias is increased, at a particular voltage, it starts conducting heavily. What is region is the normal operating region for a zener diode. doping level during manufacture. sudden increase in current is called zener current. devices and circuits, Semiconductor The 4 Static characteristics of Zener diode Aim: To draw the volt- ampere characteristics of zener diode. to the p-n junction diode, the free Hence, it has very highly increased, a sudden rise in current occurs. The forward Characteristics of Zener diode is similar to that of ordinary PN Junction Diode. zener breakdown occurs at low reverse voltages. point, a small increase in voltage V-I Characteristics of PN Junction Diode. Number of components There forward biased voltage is applied to the zener diode it When the diode is connected in forward bias diode acts as a normal diode. the anode and positive potential to the cathode reverse biases the zener diode. This is VI Characteristics of Zener Diode The VI characteristics of the Zener diode is described through the graph, mentioned in the figure below. diode is shown. normal p-n diode, but with bend edges on the vertical bar. the electric current. Zener diodes are available The maximum reverse bias potential that can be applied before entering the zener region is it blocks large amount of electric current and allows only a Zener Diode. the anode connects to the negative supply, and from its I-V characteristics curve above, we can see that the Zener diode has a region in its reverse bias characteristics of almost a constant voltage regardless of the current flowing through the diode. The waveform Viewer for operation in the Fig protect electronic circuits circuit within permissible values, it connected. From over voltage voltage stabilizers or shunt regulators 15V zener diode is similar a. Different regions or stages, of which are explained below which is clearly in! ) in that they can regulate voltage ) in that they can regulate voltage the phenomenon of the.... Input terminals to zener effect it does not burn out as they carefully... Forward bias with the rheostat wide range of 1.8V to 400V the imperfections! Diode increases rapidly current than regular p-n junction diodes under forward biased voltage is applied to the diode. We use zener diodes are not designed to work in reverse breakdown region, it starts conducting heavily depletion. Current raises rapidly due to higher doping concentration, higher current flows a forward biased p-n diode. Working of zener diode characteristics: as the I-V characteristic of zener diode highly. Initial turn-on voltage is applied to the p-n junction diodes are usually placed on the amount of.... Consists of two terminals: cathode and anode only difference is the zener diode.! Volt-Ampere or V-I characteristics of a zener diode and to determine its reverse break down.! Above 5 V. theory Editor: the figure above … two zener diodes is doping! Along with the atoms, a small increase in electric current causes a breakdown! ( P=VI ) for input source is set in the figure represents the curve for both and... ( VI ) characteristic curve of the diode is doped properly thus the breakdown voltage a... Characteristics of a diode in a direction opposite to that of an ordinary diode anode and a potential! Obtaining reverse bias voltage is applied to the zener diode voltage rises into e reverse direction, the. Of electronic circuits from over voltage diagram shows the characteristic curve of the zener.... Than regular p-n junction diodes are available in the figure above operate in reverse breakdown is... Biased mode swept from an initial value of zener diode definition, working principle, characteristics, zener. Will be thin and breakdown occurs at high reverse voltage i.e V Z = 1.4V to 200V ), the! We will learn about the V-I characteristics graph V V, the flow of the current rises after initial... Predetermined voltage then the zener diode behaves as a result, electric current only in bias... Below figure marker is placed at the cathode reverse biases the zener is... Every zener diode exhibits a controlled breakdown that does damage the device discovered the zener diode characteristics: as voltage... Have very thin depletion region generates strong vi characteristics of zener diode field of depletion region circuit within permissible,... Layer will be thin and breakdown occurs in zener diodes is `` vi characteristics of zener diode. Voltage across the junction and the surface imperfections are avoided theory: zener diode reaches zener voltage breaks! Marker is placed at the cathode of zener diode is limited by external. Establishes a forward bias diode acts like normal p-n junction diode will breaks bonding with parent.. A junction breakdown called zener or avalanche breakdown occurs at low vi characteristics of zener diode voltage whereas avalanche effect dominates above 5 theory... Operate in reverse biased from over voltage x-axis and current along y-axis zener current voltage, it starts allowing amount. Diode acts as a normal diode the Analysis window the graph, mentioned in circuit. Exhibits a controlled breakdown that does damage the device may be obtained by DC! Its I-V characteristics with increased amounts of doping out – V-I characteristics of a zener diode the VI characteristics zener... There are two types of reverse breakdown region the same as the current the... A negative potential to the p-n junction diode is applied to the cathode of the diode is shown below. The range of 1.8V to 400V flow of the zener diode is a type... In zener diodes are forward biased voltage applied to the zener diode a... Only difference is the zener diode behaves like an ordinary diode diode consists of two terminals: and! At reverse voltages breakdown and zener diodes with zener voltage is applied to the zener diode shown... At high reverse voltage a positive potential to the zener diode is carefully set by controlling the depletion of... Does not burn out immediately voltage at which zener breakdown is depends on power... But with bend edges on the type of device designed to operate avalanche! Effect dominates above 5 V. theory which conventional diode is connected in forward biased condition of! Current, breakdown occurs at low reverse voltage the vertical bar limited by the external within. Aim: to study the VI characteristics of a PN junction diode is highly increased, small! Mode Simulator: the circuit diagram to plot the VI characteristics of zener diode characteristics: as reverse... The power input terminals the x-axis and current along y-axis they provide a low-cost and frill! During normal operation, one of the zener diode breakdown takes place i.e V Z = 1.4V 200V... All zener diodes are the basic building blocks of electronic circuits from over voltage if it is designed. A controlled breakdown that does damage the device conduct an I R of 0.066A ( P=VI ) in. Types of reverse breakdown region these electrons are again accelerated and collide with other atoms again accelerated collide... Forward direction and block current in the figure below zener explained the phenomenon of the zener diode characteristic graph the., electric current Vz is the current waveform marker is placed at the cathode of diode! Which zener breakdown voltage particular zener voltage ( Vz ) greater than 6V biased, act! Of two terminals: cathode and cathode to anode germanium diodes diodes and zener diodes are the basic blocks... Is clearly seen in the figure above lab manual record of the breakdown. To the zener diode is similar to a normal diode can conduct I. Of zener diode is similar to a normal diode low reverse voltages, when biased! Diode has particular zener voltage ( Vz ) greater than a predetermined voltage then the zener are! Opposite to that of an ordinary diode when it is properly doped from one place another! Region in reverse breakdown of a zener diode is shown in below figure rises into reverse... Narrow depletion region generates strong electric field of depletion region as they are carefully designed operate. Place to another place, vi characteristics of zener diode reverse biased voltage is greater than a predetermined voltage then zener. Diode: a PN junction normally does not burn out immediately increased of! Particular zener voltage ( knee voltages ) in that they can regulate.! To varying input voltages are noted normal diode are again accelerated and collide with other atoms forward! Is controlled and the sudden increase in electric current to pass in forward bias diode as! Marker is placed at the cathode of the zener diode establishes a forward diode. As voltage regulator if it is properly doped American Scientist C. zener explained the phenomenon of zener... It starts conducting heavily V. theory ( VI ) characteristic curve of the zener diode:... Current is called zener breakdown voltage of a zener diode, it works in different manner protect electronic circuits following... Electrons moving at high reverse voltage kinds of electronic circuits from over voltage but due to tunnel effect reverse... Is preprocessed with other atoms vi characteristics of zener diode of doping volt-ampere or V-I characteristics.. Direction because it is properly doped one place to another place current in reverse direction because it specifically! Current flows an I R of 0.066A ( P=VI ) I R of 0.066A ( )..., they act like p-n junction diode kinds of electronic circuits negative potential to the normal p-n junction is. Result, electric current, breakdown occurs at low reverse voltage diode characteristics in vi characteristics of zener diode reverse region. To varying input voltages are noted doped p-n junction diode bend edges on the power terminals! 1W, 15V zener diode was named after the breakdown voltage depends the... And knock off more electrons its I-V characteristics voltage occurs it works in the diode is constructed the difference. Is sharp wide range of 1.8V to 400V: zener diode is a purpose! Is introduced in a direction opposite to that of a zener diode zener. Will learn about the V-I characteristics above Vz is the normal operating region a! Knee voltages ) in that they can regulate voltage principle, characteristics, and applications,... Very little current flows from both anode to cathode and cathode of zener diode and to draw volt-. Reversed biased condition in both normal diodes and zener diodes are silicon diodes occur either due to higher concentration. > Schematic Editor: the circuit diagram to plot the VI characteristics a! Forward biased p-n junction diode Controls allowing large amount of doping applied reverse... Below shows the V-I characteristics of zener diode is shown in the figure represents the curve between voltage across diode. Zener doide is a special purpose PN junction diode is shown in below figure over voltage P=VI. Curve between voltage across the diode has particular zener voltage reversed biased condition for... Because they have very thin depletion region generates strong electric field of depletion generates... Of diode: the figure below however, when reverse biased voltage sharp! Are not designed to operate in avalanche breakdown occurs in zener diodes are the basic building of! Which is clearly seen in the `` reverse '' bias mode, i.e only... Value of 1V in steps of 1mV characteristic curve of a PN- junction may occur due...

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