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Renesas Electronics America - Knowledgebase

What happens if Zener diodes connect in parallel?

Latest Updated:08/01/2005


I would like to connect several Zener diodes in parallel to achieve loss dispersion, but can this be done without problems?


Do not connect Zener diodes in parallel.
If several Zener diodes are connected in parallel and a voltage that exceeds the Zener voltage is applied, the Zener current becomes extremely unbalanced if there are even slight fluctuations in the Zener voltage, causing topical load concentrations In the case of combinations with large fluctuations in Zener voltage, sometimes only one of the Zener diodes switches on.
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