Main Difference Between PN Junction Diode and Zener Diode




Difference Between PN Junction Diode and Zener Diode, PN Junction Diode VS Zener Diode



The main difference between PN Junction Diode and Zener Diode is, PN Junction diode conducts current only in one direction at normal condition but Zener Diode can conduct current in both direction at normal condition.

There is little constructional difference between PN junction diode and Zener diode. Here we will discuss all important differences between PN Junction Diode and Zener Diode.



PN Junction Diode VS Zener Diode



1. PN Junction diodes are not heavily doped that is why it can not be used in reverse breakdown condition but Zener diodes are heavily doped and it can be used in reverse bias condition.


2. PN junction diode can conduct current in one direction but Zener diode can conduct current in both direction.


3. The breakdown voltage rating of PN Junction diode is more than the Zener diode.


4. The PN Junction diode will be damaged if a large reverse bias voltage is applied across it but Zener Diode is mainly designed to use in reverse bias condition.


5. PN Junction Diodes are used for rectification purposes and also used as a freewheeling diode in some of the circuits on the other hand Zener Diodes are used for voltage regulation, protection purposes.


6. PN Junction Diodes are to be connected in forward bias for its operation but Zener Diodes are connected in reverse bias for voltage regulation.








Difference between the application of PN Junction Diode and Zener Diode



Zener Diode as voltage regulator, Difference Between PN Junction Diode and Zener Diode



As you see in the above circuit diagram both PN Junction Diode and Zener Diode are used. Here the PN Junction diode is used to convert the Alternating Current(AC) to Direct Current(DC). Obviously, it is a half wave rectifier circuit. During the positive half cycle, the PN Junction diode will conduct and during the negative half cycle, it blocks the flow of current. 

A capacitor is connected in parallel to filter the impure DC supply. The capacitor filter the impure DC.

The Zener Diode is connected in reverse for voltage regulation. When an overvoltage occurs then the voltage across the Zener diode will increase and it goes beyond the Zener break down voltage and the Zener diode will start conducting current through it. 

When current start flowing through the Zener Diode then a voltage will be dropped by the Zener Diode and protect the circuit from overvoltage and it keep constant the voltage across the load.

Thus a PN junction diode and Zener Diode works differently in a circuit.







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Main Difference Between PN Junction Diode and Zener Diode Main Difference Between PN Junction Diode and Zener Diode Reviewed by ETechnoG on 20:11 Rating: 5
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