12V into a logic drive MOSFET doesn't give you much but STBs point was you can use a non-logic drive MOSFET. They usually state RDSon at 10V so again suitable for 12V drive that is 10% low plus some margin. But as you say 12V isn't necessarily available and if PC PSUs are used without dummy load resistors it can easily be out of spec, so 5V is a much better bet.
e14 prices tend to have bigger markups for low volume compared to other similar companies. For example Mouser have much less steep price volume curves in general.
e14 prices tend to have bigger markups for low volume compared to other similar companies. For example Mouser have much less steep price volume curves in general.