What is the principle of working of Zener diode?
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.
How are zener diodes marked?
In a perfectly ideal diode, current flows in one direction only, from the anode (positive side) to the cathode (negative side) which is marked with the stripe. The schematic symbol is a triangle pointing towards a bar, where the current flows in the same direction, towards the barred (striped) end.
What is Zener diode draw its symbol?
Symbol of zener diode Zener diode consists of two terminals: cathode and anode. In zener diode, electric current flows from both anode to cathode and cathode to anode. The symbol of zener diode is similar to the normal p-n junction diode, but with bend edges on the vertical bar.
How do you read a Zener diode label?
The negative or black lead of the multimeter should be on the cathode or marked side of the diode. A forward-biased silicon diode should read 0.5 to 0.7 volts, so this is the reading you should see for the zener. To test the reverse-biased voltage, switch the multimeter leads.
What are the markings on a diode?
The polarity of both diodes is indicated with a stripe on one end of the body. The stripe corresponds to the line in the schematic symbol, indicating the cathode. The other end (no stripe) is the anode, indicated by the triangle in the schematic symbol.
How Zener diode works as a voltage regulator?
When the Zener diode is given reverse bias feedback, there is a small leakage current until it attains the breakdown voltage or a constant voltage. At this point, the current begins flowing seamlessly without any change in voltage. Therefore, the constant voltage helps Zener Diode as Voltage Regulator.
How is Zener diode made?
Zener diodes are made by heavily doped n-type and p-type semiconductors. The quantity of the doping of the semiconductors is kept different so that their breakdown voltage is different.
What is the code of 12V Zener diode?
Product Information
| Manufacturer Part No | 1N4742A |
|---|---|
| Order Code: | 2125942 |
| Zener Voltage Vz Typ: | 12V |
| Power Dissipation Pd: | 1W |
| Diode Case Style: | DO-41 (DO-204AL) |
How are diodes numbered?
The first number in the system indicates the number of junctions in the semiconductor device and is a number, one less than the number of active elements. Thus 1 designates a diode; 2 designates a transistor (which may be considered as made up of two diodes); and 3 designates a tetrode (a four-element transistor).