Thanks to all who responded.

The higher gate voltage is useful if the control supply is 24V for example
or if it comes from a self oscillating converter with no regulation, or
when the part is used in special applications (telephony f.ex). Vgs >= 30V
does not mean threshold voltage >12V. For example I could use mosfets with
Vgs = 350V (are there such things ?) for simpler automation directly off
mains.

Peter

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