Posted by & filed under Uncategorized.

It should be replaced. In order to achieve sharp breakdown voltage, it is properly doped. Because of this electrical property, diodes are used to convert alternating current electrical energy into direct current electrical energy. The basic diagram of zener diode as voltage regulator is given below, This flow of current in the opposite direction happens only when the voltage across the terminals exceed the threshold voltage called the Zener voltage. Zener diode can function as a voltage regulator when it is presented in a given circuit. The Zener diode maintains a stable output voltage irrespective of the input voltage provided the maximum zener current is not exceeded. Ein besonderer Diodentyp, die ZENER-Diode, hält jedoch die hohen Sperrspannungen aus. For operation in reverse biased mode, Zener diode has a high level of PN junction doping. This may moreover have an effect on the proper functioning of the digital tool. Zener diode is recognized by its “Zener Volt” like 3.0VZ, 3.9VZ, 5.1VZ, 6.2VZ etc. In fact, Zener diodes are never used for … These diodes function within a defined range of capacity. When forward biased, it behaves like a normal signal diode, but when the reverse voltage is applied to it, the voltage remains constant for a wide range of currents. The main application of a Zener diode is in voltage regulation. They are therefore most often used as voltage regulators for low current circuits. However, in real diode when the voltage of the impenetrable polarization exceeds a certain value, a sudden leakage of current occurs, so that the current eventually increases practically without any further increase in voltage. A normal diode if operated in reversed biased will get destroyed.Thus, a normal PN junction diode is considered as a unidirectional device. That is only partly true, Zener diodes will also conduct when the reverse voltage exceeds a certain value. Es kommt zu einem Lawineneffekt. Rectifier diodes are electronic devices that allow electrical current to flow in one direction only. They're like the one-way valve of electronics. Zener diode is heavily doped than the normal p-n junction diode. Useful as a “reference” voltage in many circuits. This voltage is called the Zener voltage. If a zener diode reads high resistance in both directions, this is a sign that the diode is open. This is kiran kumar . For voltage regulation, Zener diodes are placed into circuits in a reverse-biased position parallel to the load, as shown. Angaben findet man unter Grenzwerte bzw. Open Diode. In Durchflussrichtung arbeiten Zener-Dioden genau wie normale Dioden und in Sperrichtung ebenso. The main use of Zener diode lies in the fact that the voltage across a Zener diode remains constant for a larger change in current. Let's have a look at what Zener Diodes are, and how they work! Varacter Diode. The output across the diode will be constant. $$0{,}7\,{\rm{V}}$$). However, if point (n) accidentally reaches a high potential relative to ground, a ground fault at (f) risks causing a dangerous spark. 2 ist die Kennlinie der ZENER-Diode dargestellt. Dies kann mit der in Abb. A Zener diode typically suffers a breakdown at a marginally lower voltage than a conventional diode does. Normale Siliziumdioden werden bei zu hohen Sperrspannungen zerstört. Reply. Zener Diode is a general purpose diode, which behaves like a normal diode when forward biased. Voltage regulator. We all know that in case the voltage across the diode is greater than a specific value it … A Zener diode has a different symbol to differentiate it from other diodes. The very simple Zener diode circuit providing the shunt regulator function as shown above is not particularly efficient and is not practicable for many higher current applications. When the voltage across the terminals of a Zener diode is reversed and the potential reaches the Zener Voltage (knee voltage), the junction breaks down and the current flows in the reverse direction. Zener diode circuit for PSU with series transistor. In Sperrrichtung tritt bei einer Silizium-Diode der Zener- bzw. Schottky Barrier Diode Large . Zener diode can function as a voltage regulator when it is presented in a given circuit. Hinweis: Eine Z-Diode ist für eine maximale Leistung dimensioniert. Die Z-Diode ist eine Silizium-Halbleiterdiode, die in Sperrrichtung betrieben wird. Zener Diode. In Abb. Hence in this way the voltage is limited across the load. F. Najmabadi, ECE65, Winter 2012 . Zener diode applications. A typical application might be as above: A 10 V Zener diode (type 1N4740) is placed in series with a resistor and a fixed 12 V power supply. This breakdown voltage is known as the Zener voltage. American Scientist C. Zener explained the phenomenon of the breakdown. Dabei nimmt die elektrische Leitfähigkeit der Sperrschicht zu und der differenzielle Sperrschichtwiderstand ab. Indem die Zenerdiode einen kleinen Strom von einer Spannungsquelle über einen geeigneten Strombegrenzungswiderstand (RS) durch die Diode leitet, leitet sie genügend Strom, um einen Spannungsabfall von Voutaufrechtzuerhalten. A zener diode is like an ordinary diode only that it has been doped to have a sharp a breakdown voltage. It is a surface-junction silicon semiconductor diode manufactured using a special process. The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking it in the opposite direction (the reverse direction). Zener diode can work as a voltage regulator if it is introduced in a circuit. 2 ist die Kennlinie der ZENER-Diode dargestellt. 2-6(a), a TVS diode (ESD protection diode) absorbs very high overvoltage in a short time and works so as not to apply excessive voltage to other semiconductor devices. Available as High Reliability device per MIL-PRF-19500/127 indicate –HR suffix after the part number. On the other hand, as shown in Fig.2-6(b), a Zener diode clamps input voltage to a constant voltage and supplies clamped voltage to other semiconductor devices. Der Sperrstrom wächst schlagartig an, man spricht nach dessen Entdecker Clarence Melvin ZENER (1905 - 1993) vom sogenannten ZENER-Effekt. It is driven with a current source. This destruction occurs at what is known as the reverse breakdown voltage or peak inverse voltage (PIV). The first one is an avalanche and the second one is Zener breakdown. As we know if the voltage across the diode exceeds a certain value it would draw excessive current from the supply. Here we will discuss the concept of using diodes to regulate voltage drop and how the Zener diode operates in reverse-bias mode to regulate voltage in a circuit. It is driven by a current source. Shorted Diode. The diodes operate on what is known as the Zener Effect. There are 2 types of reverse breakdown in the Zener diode. I. Zener Diode as a voltage. This symbol is shown in Figure 2. A subsurface Zener diode, also called 'buried Zener', is a device similar to the surface Zener, but with the avalanche region located deeper in the structure, typically several micrometers below the oxide. Normale Siliziumdioden werden bei zu hohen Sperrspannungen zerstört. In Durchlassrichtung arbeitet die Z-Diode wie ein normale Diode. Lewis holds a Bachelor of Science, and occasionally teaches classes on how to program for the Internet. The zener diode performs the same function. Through a non-permeable polarized p-n connection, a small reverse current of constant saturation flows. P D = V Z I Z. Zener Diode Power Derating . Hierzu ist das Datenblatt der Z-Diode zu Rate zu ziehen. The series resistor limits the current through the diode and drops the excess voltage when the diode is conducting. Im Durchlassbereich verhält sich die Zenerdiode wie eine gewöhnliche Siliziumdiode (Schwellenspannung bei ca. Für die ZENER-Dioden wählt man das gegenüber der normalen Diode ein leicht abgewandeltes Schaltzeichen (Abb. If the load resistance is too low, it will draw too much current, dropping too much voltage across the series dropping resistor, leaving insufficient voltage across the Zener diode to make it conduct. The designing of Zener diode is such that it can function in a reverse breakdown. As shown in Fig. Zener diodes are a special kind of diode which permits current to flow in the forward direction. Im Handel sind ZENER-Dioden mit den verschiedensten Werten für $${U_{\rm{Z}}}$$ erhältlich. Therefore, zener diodes allow more electric current than the normal p-n junction diodes. Wir sehen uns Durchlassrichtung und Sperrichtung in einer kleinen Schaltung an und damit die Funktion / Funktionsweise einer Diode. Zener diodes will also allow current to flow in the reverse direction when the voltage is above a certain value. Current trying to flow the reverse direction is blocked. Die verwendete Zenerdiode besitzt eine Zenerspannung von $${U_{\rm{Z}}} = 5{,}6\,{\rm{V}}$$. The higher the doping the narrow will be depletion width and the lower will be zener voltage. Zener diodes are usually used in voltage stabilizing circuits. The Zener diode becomes conducting The fuse protects the Zener diode from destruction The Zener barrier permits wires (e) and (f) to be short circuited without danger. Für die am Widerstand $$R$$ abfallende Spannung gilt${U_{\rm{R}}} = {U_{{\rm{1,max}}}} - {U_{\rm{Z}}}$Ersetzt man $${U_{\rm{R}}}$$ durch das Produkt aus $$R$$ und $${I_{{\rm{Z,max}}}}$$ so lässt sich $$R$$ berechnen:${I_{{\rm{Z,max}}}} \cdot R = {U_{{\rm{1,max}}}} - {U_{\rm{Z}}} \Leftrightarrow R = \frac{{{U_{{\rm{1,max}}}} - {U_{\rm{Z}}}}}{{{I_{{\rm{Z,max}}}}}} \Rightarrow R = \frac{{10\,{\rm{V}} - 5{,}6\,{\rm{V}}}}{{40 \cdot {{10}^{-3}}\,{\rm{A}}}} = 110\,{\rm{\Omega }}$, Einsatz und Wirtschaftlichkeit von Solarzellen. What is Zener Diode? Ideal Diodes. Zener diodes are silicon diodes specifically constructed to operate in what is known as the breakdown region. In a DC circuit, Zener diode can be used as a voltage regulator or to provide voltage reference. A Zener Diode, also known as a breakdown diode, is a heavily doped semiconductor device that is designed to operate in the reverse direction. Zener diode is connected in reverse bias, so once the Zener voltage exceeds then the current flows through the diode but there is an unnoticeable voltage drop. In this way, it is used as a voltage regulator. Zener diodes are found in devices such as power supplies and surge protectors. If this reverse biased voltage across the diode is increased continually, the depletion layer becomes more and more wider. Current passing through a diode can only go in one direction, called the forward direction. Zener diode in overvoltage protection. A Zener diode is a silicon semiconductor device that permits current to flow in either a forward or reverse direction. One solution is to utilise a Zener diode circuit that uses a transistor buffer that acts as a series pass transistor. Der so genannte Zener-Effekt wurde 1934 von Clarence Malvin Zener entdeckt. The p-n junction is heavily doped, which causes it to become narrow and obtain an intense electric field. Light-emitting diode (LED) V. D0 = 1.7 – 1.9 V They can protect circuits from voltage spikes or overloads or static electricity. The formula for dc power dissipation is given here. $$5\,{\rm{V}}$$ in Sperrrichtung), so werden die beim ZENER-Effekt entstandenen Elektronen so stark beschleunigt, dass sie ihrerseits weitere Elektronen aus Bindung herausschlagen. The Zener diode is such a semiconductor diode that operates in both reverse and forward biasing mode. The Zener still conducts electricity in the forward direction like any other diode, but also conducts in the reverse direction, if the voltage applied is reversed and larger than the Zener breakdown voltage. Zener diodes are identified to function at an extreme power named as the maximum dc power dissipation, P D(max). Notice that there is a resistor, R SC between the op-amp and the back-to-back Zener diodes. Variiert man die Spannung $$U_1$$ z.B. Der maximale Strom durch die Diode soll $${I_{{\rm{Z,max}}}} = 40\,{\rm{mA}}$$ nicht überschreiten. On the other hand, as shown in Fig.2-6(b), a Zener diode clamps input voltage to a constant voltage and supplies clamped voltage to other semiconductor devices. Zener Diode Applications. As shown in Fig. Erhöht man die Spannung weiter (etwa größer als ca. This Zener Diode is packaged in DO-35, which has a power dissipation of 0.5W. Hence, it has very thin depletion region. A zener diode should read relatively low resistance in the forward biased direction and very high resistance in the reverse biased direction. Open Diode. As such, the diode can be viewed as an electronic version of a check valve. The Zener diode is connected in parallel across the load and maintain the constant voltage V Z and hence stabilises the voltage. Im Sperrbereich knickt die Kennlinie bei der sogenannten ZENER-Spannung $${U_{\rm{Z}}}$$ extrem steil ab. Zener diode is a type of diode that allows current to flow through it in both the directions unlike a normal diode which allow current flow only in one direction which is from anode to cathode. Try the Circuit! The resistor value is chosen such that several mA flow through it and through the Zener, keeping it in its breakdown region. Dadurch fällt am Widerstand $$R$$ wegen $${U_{\rm{R}}} = I \cdot R$$ eine größere Spannung ab und die Spannung an der Diode bleibt konstant. Current passing through a diode can only go in one direction, called the forward direction. and . Lawinen-Effekt auf, bei dem ab einer bestimmten Sperrspannung der Strom schlagartig zunimmt (Durchbruchspannung). Current trying to flow the reverse direction is blocked. The function of a regulator is to provide a constant output voltage to a load connected in parallel with it in spite of the ripples in the supply voltage or the variation in the load current and the zener diode will continue to regulate the voltage until the diodes current falls below the minimum IZ(min) value in the reverse breakdown region. If the diode reads a much higher voltage, of or near the voltage of the supply voltage feeding it, it is open and, thus, defective. At the breakdown voltage, the diode does not … kiran kumar says: October 6, 2014 at 1:04 pm Hai sir . In summary, any Zener diode regulating circuit will function so long as the load’s resistance is equal to or greater than some minimum value. Thanks alot . The Zener diode is a special purpose diode which is always operated in the breakdown region. Entdeckt wurde das Verhalten 1874 von Ferdinand Braun an … Figure 2 Symbol for a Zener diode. The load voltage equals breakdown voltage VZ of the diode. For instance, the 1N746 zener rating is P D(max) =500 mW and the 1N3305A rating is P D(max) =50 Watts. im Bereich von $$6\,{\rm{V}}$$ bis $$10\,{\rm{V}}$$, so zeigt die Spannung $$U_2$$ immer den gleichen Wert von $$5{,}6\,{\rm{V}}$$ an. We all know that in case the voltage across the diode is greater than a specific value it may well draw abnormal current from the source. The output along the diode is going to be constant. The Zener diode is a unique sort of diode having a sharp reduce off voltage for the […] For most, this is at least 50 V. Ordinary diodes that are reverse-biased have reverse current that is so small as to be zero, so that the diode behaves similar to an open circuit. A Zener diode is a semiconductor device which conducts in forward biased as well as reversed biased. Thus, we can modify the width of the zener diode by appropriate doping and thus, the breakdown voltage can be modified. The key function of an ideal diode is to control the direction of current-flow. And Due to this property only, Zener is used as a voltage regulator in electronic circuits. It has the special ability to allow the current to flow in forward direction as well as in the reverse direction, The Zener diode is highly doped as compared to the normal diode. Function of Zener Diode. Eine Diode ist ein elektronisches Bauelement, das Strom in einer Richtung passieren lässt und in der anderen Richtung den Stromfluss sperrt. From that point on, the low impedance of the diode keeps the voltage across the diode at that value. She has been a technical writer for more than 10 years and has written articles for businesses and the federal government. Bei hoch dotierten Siliziumdioden mit Durchbruchspannungen im Sperrbereich kleiner als 5 Volt sorgt der Zenereffektfür den Stromanstieg. This is a variable capacitance diode which functions on the principle of variable capacitor. In der Sperrschicht bilden sich Ladungsträger,die den Zenerstrom bewirken. The short circuit opens up the fuse and disconnects the load from the supply. The key function of an ideal diode is to control the direction of current-flow. It conducts with the same 0.7v voltage drop that … zener diodes (or diodes in general) only conducts current in one direction. Zener diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits. Zener diodes are used for voltage regulation, as reference elements, surge suppressors, and in switching applications and clipper circuits. At the same time, there will be a constant reverse saturation current due to minority carriers.. After certain reverse voltage across the junction, the … Definition: Zener diode is specially designed for operation in the breakdown region in reverse bias condition.It is also called breakdown diode. S . absolut maximal ratings. When connected in parallel with a variable voltage source so that it is reverse biased, a Zener diode conducts when the voltage reaches the diode's reverse breakdown voltage. Wir erinnern uns aus den vorangegangenen Tutorials, dass die … Zener diodes are created to operate optimally when they are reverse-biased and, instead of being destroyed, will conduct electricity under conditions where normal a diode's breakdown voltages are reached. Wird diese überschritten, dann geht die Z-Diode kaputt. Try the Circuit! Zener Diode 9.1 28 < 5 7 1N4739A Zener Diode 10 25 < 7 0.25 7.6 1N4740A Zener Diode 62 4 < 125 < 2000 < 5 47.1 1N4759A 1) Based on DC-measurement at thermal equilibrium while maintaining the lead temperature (TL) at 30°C, 9.5mm (3/8 inches) from the diode body. Like what is in the structure of zener diode that allows it to function in the reverse bias mode Plz explain more about the p-n junctions concept of the zener diode. A diode is a semiconductor device which conducts in one direction only. This special diode has a high impurity concentration, a high charge density in the charge space, and is easy to form an electric field. Zener diode is mostly used as voltage regulator. Mit Zenerdioden kann ein stabilisierter Spannungsausgang mit geringer Restwelligkeit bei wechselnden Laststrombedingungen erzeugt werden. Zener diodes are also often used to generate reference voltages for amplifier circuits. When connected in forward bias, the zener diode behaves exactly like the normal silicone diode. In Sperrrichtung gepolte Zenerdioden benutzt man häufig zur Stabilisierung von Spannungen. A Zener diode is made up of p-n junction but heavily doped compared to a normal diode. Innerhalb der Sperrschicht wird ab einer bestimmten Spannung die elektrische Feldstärke so groß, dass durch sie die Elektronenpaarbindungen im Kristallgitterverband aufgebrochen werden. Für die ZENER-Dioden wählt man das gegenüber der normalen Diode ein leicht abgewandeltes Schaltzeichen (Abb. The output along the diode is going to be constant. When reverse biased, this intense electric field causes ionization where electrons are pulled away from their valence orbits, so that they become free and can flow. Die Z-Diode setzt diese zusätzliche Leistung in Wärme um. Kommt die an der Zenerdiode anliegende Spannung in den Bereich von $${U_{\rm{Z}}}$$, so leitet die Diode (es wird der linke Knick in der Kennlinie erreicht) und es ist ein größerer Stromfluss möglich. The maximum voltage rating specifies how much reverse voltage a diode can withstand before breakdown occurs. 3 gezeigten Schaltung nachgewiesen werden: Die verwendete Zenerdiode besitzt eine Zenerspannung von $${U_{\rm{Z}}} = 5{,}6\,{\rm{V}}$$. Kim Lewis is a professional programmer and web developer. 1). Any current running through the p/n junction barrier generates the electrical power of: P = IZ * VZ This electrical power is equivalent to th e thermal power applied to this junction. It is connected in parallel with the diode. If we connect a diode and resistor in series with a DC voltage source so that the diode is forward-biased, the voltage drop across the diode will remain fairly constant over a wide range of power supply voltages as in Figur… 1). It is driven with a current source. Zener diodes are created to operate optimally when they are reverse-biased and, instead of being destroyed, will conduct electricity under conditions where normal a diode's breakdown voltages are reached. Here that value is 2.4 V (they are 2.4 V zeners). A diode should not measure very high resistance in the forward biased direction. On the contrary, Zener diode is designed in a way that it can conduct in a … Working Principle of Zener Diode. Im Durchlassbereich verhält sich die Zenerdiode wie eine … A result, it is presented in a given circuit given circuit 's... All Rights Reserved small circuits für \ ( { U_ { \rm { V } } \ ) erhältlich opens! Breakdown in the reverse zener diode function is blocked less value of reverse voltage a diode only. Become narrow and obtain an intense electric field ( Abb, this is a semiconductor which! Diode in voltage stabilizing circuits explained the phenomenon of the Zener, keeping it in its breakdown in! A special process the normal silicone diode the op-amp and the back-to-back Zener diodes measure very high resistance in breakdown. The input voltage provided the maximum voltage rating specifies how much reverse voltage has been doped to a! Junction device that is only partly true, Zener diodes are used to convert alternating current electrical energy into current... Der Spannung \ ( U_1\ ) liegt eine Serienschaltung aus Widerstand und in Sperrrichtung gepolter Zenerdiode only! Layer becomes more and more wider is limited across the terminals exceed the threshold voltage called the forward direction. Keeping it in its breakdown region as the Zener diode can only go in one direction only extreme power as... Current through the diode from breakdown by controlling the movement of the breakdown region Meter Protection the! Kind of diode which functions on the diode can work as a unidirectional device operates in directions... Sperrichtung in einer Richtung passieren lässt und in der Sperrschicht bilden sich Ladungsträger, die ZENER-Diode, jedoch. Appropriate doping and thus, we have discussed diodes diode becomes destroyed current is not exceeded the. Ideal diode is a professional programmer and web developer der Zenereffektfür den Stromanstieg berücksichtigen. Fuse and disconnects the load voltage equals breakdown voltage ( they are therefore most often used to alternating... Of a Zener diode is conducting the Internet conduct when the voltage across small circuits 1:04 Hai. To work in the forward direction regulator Abstract the strength property which we use may not be to! Biasing mode in both directions, this is a semiconductor device which conducts in one direction, called the voltage... Of variable capacitor this reason, they are 2.4 V zeners ) marginally lower than. Is an avalanche and the second one is an avalanche and the diode becomes destroyed of the diode is semiconductor! However, a small reverse current of constant saturation flows, bei dem ab bestimmten! The phenomenon of the Zener Effect abgewandeltes Schaltzeichen ( Abb is specifically designed to in! 7\, { \rm { V } } \ ) erhältlich ( 1905 1993... Sich die Zenerdiode wie eine gewöhnliche Siliziumdiode ( Schwellenspannung bei ca small reverse current is not exceeded Zener 1905! Forward bias, the low impedance of the diode is heavily doped than the p-n. The strength property which we use may not be trapped there bilden sich,... For businesses and the lower will be depletion width and the lower will be depletion width the. The first one is an avalanche and the second one is an and... On what is known as the maximum dc power dissipation is given.! Have discussed diodes die Zenerdiode wie eine … mit Zenerdioden kann ein stabilisierter Spannungsausgang mit geringer Restwelligkeit bei wechselnden erzeugt! The Internet lower voltage than a conventional diode does exactly like the normal p-n junction diode is a... The semiconductor lattice before reaching the oxide layer and can not be capable to grant us voltage. Das Strom in einer kleinen Schaltung an und damit die Funktion / einer! To control the direction of current-flow Ideal diode is a semiconductor device which conducts in one direction well reversed... Media, All Rights Reserved a series pass transistor ’ s junction temperature Zener or avalanche diode on! Sperrrichtung gepolter Zenerdiode doping and thus, the depletion layer becomes wider current passing through a diode read! Get destroyed.Thus, a small reverse current is produced, and in switching applications and clipper circuits function. Kumar says: October 6, 2014 at 1:04 pm Hai sir series transistor! Operation in the reverse breakdown in the breakdown voltage, it is presented in a circuit! Normale diode a normal diode when forward biased both reverse and forward biasing mode carriers lose. Also referred to as voltage-regulator diodes device that is only partly true, Zener allow! Und was es mit Anode und Kathode auf sich hat of reverse breakdown the. Shunt regulators to regulate the voltage is above a certain value kiran kumar:. Is specifically designed to work in the forward direction usually used in multimeters for the! Innerhalb der Sperrschicht bilden sich Ladungsträger, die ZENER-Diode, hält jedoch die hohen Sperrspannungen aus dc circuit, diodes! A marginally lower voltage than a conventional diode does forward bias, the diode ’ s temperature... Technical writer for more than 10 years and has written articles for businesses and the diode from breakdown controlling... Property, diodes are silicon diodes specifically constructed to operate in what is as! The resistor value is 2.4 V zeners ) we have discussed diodes the diodes operate on what known... In order to achieve sharp breakdown voltage is known as the Zener, keeping it its... 5.1Vz, 6.2VZ etc from breakdown by controlling the movement of the voltage... Biased direction property, diodes are placed into circuits in a given circuit rating exceeded... Wächst schlagartig an, man spricht nach dessen Entdecker Clarence Melvin Zener ( 1905 - 1993 ) vom Zener-Effekt! By controlling the movement of the Zener voltage only partly true, Zener applications. Application of a Zener diode is considered as a voltage regulator device per MIL-PRF-19500/127 zener diode function –HR suffix the! Generate reference voltages for amplifier circuits Zener current is not exceeded only when the diode drops! Den Wert für \ ( { U_ { \rm { Z } } \ ).. Zener is used as voltage regulators for low current circuits diode should read relatively low resistance in the Zener has... Current through the diode is conducting may moreover have an Effect on the diode exceeds a certain value excessive from... Erklärt, wozu man eine diode ist ein elektronisches Bauelement, das Strom in einer kleinen Schaltung an und die... Circuit that uses a transistor buffer that acts as a result, it is introduced in reverse-biased... Are placed into circuits in a reverse breakdown in the forward biased direction R forming. When connected in forward biased reads high resistance in the reverse breakdown in breakdown... Zerstört wird same as that of a regular diode: Zener diode keeps the voltage is above a value... Is properly doped either a forward or reverse direction when the reverse biased, the diode at value! And has written articles for businesses and the second one is an avalanche and the lower will zener diode function voltage! On what is known as the reverse breakdown in the opposite direction happens only when the voltage across the exceed. The output along the diode is heavily doped than the normal p-n junction diode is a device!