I am sure that some rigs use an "open drain" MOSFET instead of a
"normal" transistor. The built-in "body diode" of the MOSFET acts as a
built-in snubber for the reverse polarity transient, and should easily
handle the current.
On 12/24/2017 11:49 AM, Paul Christensen wrote:
A single-component option with the benefits of the combo diode/Zener that Jim
described is a “Transorb” device. The link below opens an application note that
discusses various forms of coil transient suppression, beginning with passive,
then single diode, a combo diode-Zener (mentioned by Jim and recommended by
Schrack) and then concludes with the “Transil,” ST’s trade name for their
transorb device.
https://tinyurl.com/ydyy8pqt
Paul, W9AC
Sent from my iPhone8
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