It usually a bad idea to power any active circuit from a logic signal -
Agreed. That's why I'd like to use the logic signal to control a switching device (MOSFET?) which provides the power to the circuits which also run on 3.3V.
What I'm finding seem to have Vgs more than 3.3V. Looking for something where I can attach the Drain to 3.3V, the Source to the load and control it with 0V (off) and 3.3V (on).
Everything I seem to find is for (relatively) high power/voltage requirements.