summary of Zener Diodes

summary

● Zener diodes are designed to operate at voltages greater than the breakdown voltage (peak reverse voltage).

● The breakdown voltage of a zener diode is deter- mined by the resistivity of the diode.

● Zener diodes are manufactured with a specific breakdown (zener) voltage.

● Power dissipation of a zener diode is based on temperature and lead lengths.

Zener diodes are packaged the same as P–N junction diodes.

● Zener diodes with a breakdown voltage greater than 5 V have a positive zener voltage- temperature coefficient.

Zener diodes with a breakdown voltage less than 4 V have a negative zener voltage temperature coefficient.

● Zener diodes are used to stabilize or regulate voltage.

● Zener diode regulators provide a constant output voltage despite changes in the input voltage or output current.

● Zener diodes can be tested for opens, shorts, or leakage with an ohmmeter.

● To determine whether a zener diode is regulat- ing at the proper voltage, a regulation test must be performed.

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