What Is The Difference Between Zener Diode And Rectifier Diode?

What is the basic difference between zener diode and silicon diode?

The major difference between PN junction and the Zener diode is that the PN junction diode allows current to pass only in the forward direction, whereas the Zener diode allows the current to flow both in the forward and the reversed direction..

What is the zener breakdown voltage?

The Zener Breakdown is observed in the Zener diodes having Vz less than 5V or between 5 to 8 volts. When a reverse voltage is applied to a Zener diode, it causes a very intense electric field to appear across a narrow depletion region.

How zener diode is fabricated?

A Zener diode is fabricated by heavily doping both p and n sides of the junction. Because of heavy doping, a very thin (<10−6 m) depletion region is formed between the p and n sides, and hence, the electric field of the junction is extremely high (~5 × 106 V/m) even for a small reverse bias voltage of about 5V.

How do you identify a zener diode?

Zeners may be indistinguishable from regular diodes. Zener diodes may have a dark plastic casing with a dark stripe, which is the same coloring as that of other diodes. Many other zener diodes are copper colored, and are enclosed in a glass casing with a white or black or blue stripe.

What is the difference between diode and zener diode?

A diode is a semiconductor device which conducts in one direction only. A Zener diode is a semiconductor device which conducts in forward biased as well as reversed biased. A normal diode if operated in reversed biased will get destroyed.

Why zener diode is used in reverse bias?

When the Zener diode is reverse biased the junction potential increases. … As the breakdown voltage is high this will provide high voltage handling capacity. As the reverse voltage is increased, the reverse current increases drastically at a certain reverse voltage.

What happens when zener diode is connected in series?

Zener diodes can be placed in series or parallel with other circuit elements, which includes other Zener diodes. When using Zener diodes in series, the current and voltage distribution will follow Kirchoff’s laws, and you can derive a specific relationship for the voltage and current distribution in your diodes.

What is a Schottky diode used for?

Schottky diodes are used for their low turn-on voltage, fast recovery time and low-loss energy at higher frequencies. These characteristics make Schottky diodes capable of rectifying a current by facilitating a quick transition from conducting to blocking state.

What are the advantages of Zener diode?

Advantages of Zener DiodesLess expensive than other diodes.Ability to shift voltage.Easily compatible and obtainable across systems.High-performance standard.Protection from over-voltage.Ability to regulate and stabilize circuit voltage.Greater control overflowing current.Usable in smaller circuits.Sep 17, 2020

How do you know if a Zener diode is bad?

Measure the reverse-biased voltage on the Zener diode by switching the multimeter probes. Place the positive lead on the marked or cathode side, and the negative lead on the unmarked or anode side. You should get a reading indicating infinite resistance or no current flow.

What is the basic principle of Zener diode?

A Zener diode is a silicon semiconductor device that permits current to flow in either a forward or reverse direction. The diode consists of a special, heavily doped p-n junction, designed to conduct in the reverse direction when a certain specified voltage is reached.

What happens if Zener diode is forward biased?

When Zener diode is biased in the forward direction it behaves like a normal signal diode passing the current increasing linearly with voltage, but as soon as a reverse voltage applied across the Zener diode attains the breakdown voltage of the device, a large current starts to flow through the diode.

Is Zener diode heavily doped?

Zener diode is a special type of diode that is designed to work in reverse condition. Under forward bias condition, the diode acts as a normal diode. The Zener diode, however, is heavily doped, as a result, they have a thin depletion region.

What is Zener diode characteristics?

A Zener diode operates just like a normal diode when it is forward-biased. However, when connected in reverse biased mode, a small leakage current flows through the diode. As the reverse voltage increases to the predetermined breakdown voltage (Vz), current starts flowing through the diode.

Why zener diode is called zener diode?

Zener diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits. 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.

Why zener diode is used in Rectifier?

A Zener diode is made up of a PN junction but heavily doped compared to a normal diode. As a result, it can undergo breakdown without being damaged. And Due to this property only, Zener is used as a voltage regulator in electronic circuits. In fact, Zener diodes are never used for rectification purposes.

Where are zener diodes used?

Zener diodes are used for voltage regulation, as reference elements, surge suppressors, and in switching applications and clipper circuits. The load voltage equals breakdown voltage VZ of the diode. The series resistor limits the current through the diode and drops the excess voltage when the diode is conducting.

Which diode is used for rectifier?

For power rectification applications, power diodes or Schottky diodes are normally used. For signal rectification small point contact diodes, signal diodes, or Schottky diodes may be used. The Schottky diode has the advantage that it only requires a forward voltage of around 0.2 – 0.3volts for forward conduction.

How do you calculate Zener current?

The maximum current is calculated by dividing the power rating by the Zener voltage: I=P/V = 3W/12V = 0.25A.

What happens when a zener diode fails?

Interestingly enough, when Zener diodes fail due to excessive power dissipation, they usually fail shorted rather than open. A diode failed in this manner is readily detected: it drops almost zero voltage when biased either way, like a piece of wire.

Is zener a rectifier diode?

Unlike the normal p-n junction diode, a Zener diode has a low peak inverse voltage. This is an undesirable property for the rectifier circuit. This is the reason why Zener diodes are not used for rectification purpose but are mostly used in applications that require voltage regulation.