WEET - How to Detect the Quality of Diodes

Method for detecting the quality of diodes:


1. Detection of ordinary diodes: (including detector diodes, rectifier diodes, damping diodes, switching diodes, and freewheeling diodes) is a semiconductor device composed of a PN structure with unidirectional conductivity characteristics. By using a multimeter to detect its forward and reverse resistance values, the electrode of the diode can be identified, and it can also be estimated whether the diode is damaged.

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2. Detection of zener diode: Connect the positive terminal of the megohmmeter to the negative terminal of the zener diode, and connect the negative terminal of the megohmmeter to the positive terminal of the zener diode. Shake the handle of the megohmmeter at a constant speed according to regulations, and monitor the voltage values at both ends of the zener diode with a multimeter (the voltage range of the multimeter should depend on the size of the stable voltage value). When the voltage indication on the multimeter is stable, This voltage value is the stable voltage value of the zener diode. If the stable voltage value of the zener diode is measured to fluctuate, it indicates that the diode is unstable.

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WEET: what is Zener Diode

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Zener diode, allows current to flow not only from its anode to its cathode, but also in the reverse direction, when the Zener voltage is reached.

Zener diodes have a highly doped p-n junction, can reliably operate in breakdown region.

Zener reverse breakdown is due to electron quantum tunnelling caused by a high-strength electric field.

Zener diodes are widely used in electronic equipment of all kinds and are one of the basic building blocks of electronic circuits. They are used to generate low power stabilized supply rails from a higher voltage and to provide reference voltages for circuits, especially stabilized power supplies. They are also used to protect circuits from overvoltage, especially electrostatic discharge (ESD).

 

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WEET Difference Between Rectifier Diode, Schottky Diode, Zener diode

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WEE manufactures diodes since 2000, welcome your inquiries and orders.

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