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What kind of impedance is dynamic impedance Zz?

Latest Updated:11/01/2007


The characteristics of Zener diodes in the data sheet include a characteristic called dynamic impedance Zz. What kind of impedance is this?


Dynamic impedance Zz is the differential impedance of the area surrounded by the circle in the following figure.
To measure it, a small AC signal is superposed on a Zener current and measured as the differential impedance.
The dynamic impedance of a Zener diode with Vz within the range of about 6 V to 7 V is lowest. It becomes higher for Zener diodes with either lower or higher Vz.

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