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Can two NNCDs (each facing the other) be use?

Latest Updated:11/01/2005

Question:

When using NNCDs to protect signal lines such as RS-232C from ESD, should two NNCDs, each facing the other, be used?

Answer:

Both positive and negative ESD may be superimposed on signal lines.
Therefore, it is recommened to use bi-directional zenner diodes.
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