The table shown on page 2 of this P&B white paper compares drop-out time from a
common 12V frame relay relative to coil suppression type. In this example, a
Zener with a breakdown voltage of 2X the supply voltage was chosen. The table
clearly shows a tradeoff between drop-out time and measured transient voltage
created by the collapsing coil field.
https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=13C3311_AppNote&DocType=CS&DocLang=EN
Paul, W9AC
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