OK, I've got a P channel FET (not my design, just took it over) that is usi= ng 3.3V to switch another 3.3V supply (always on turning on the rest of the= board). Part is a FDC638P. Looking at the data sheet, Vgs is the voltage= differential to turn on the gate, right? So pretty much....you can't have= the same voltage on both the gate and drain to turn it on, just wont work.= Now if I had 5V (or anything more than 4.1V) there, with a resistor to gr= ound to keep it turned off, that should work. = --------------------------------- Yahoo! Messenger with Voice. Make PC-to-Phone Calls to the US (and 30+ coun= tries) for 2=A2/min or less. -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist