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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.
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Zener impedance is the equivalent series resistance of a Zener diode when it is conducting current. Zener impedance should ideally be zero, but in reality, a Zener diode has some impedance. Thus, a Zener diode acts as such only in a limited current range.
A Zener diode is a type of diode designed to use Zener breakdown in the reverse-biased state. Reverse current suddenly increases at Zener voltage. In other words, Zener voltage is only slightly dependent on reverse current. Still, Zener voltage changes in response to a change in current. The rate of this change is specified as dynamic impedance.
Zener diodes exhibit higher impedance than the specified dynamic impedance in the lower and higher current regions as shown Fig. 1. In these regions, Zener voltage might change considerably in response to a change in current or temperature. Care should be exercised when Zener diodes are used in constant-voltage circuits.
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