voltage between source and gate is in the millivolts, probably not a problem. However, I'm able to pull anywhere from 100uA to 10mA (it seems to just float around) from the drain when the gate is high and as would be expected with such high leakage the led is still bright when gate is at 5V. I figure either the thing is blown or I'm no good at soldering .6mm pin pitch components (let alone hand drawing the circuit board with a sharpie!) and I might have a tiny bridge or parasitic current flowing through flux residue somewhere. Seeing as the intended purpose for the MOSFETs was a switch to connect and disconnect a battery from it's charger the slight leakage might be OK, but I was also planning on using them as an LCD backlight on/off/PWM control in which case they would certainly need to turn off! I'll test out the other MOSFETs tomorrow and see if I get similar results,
FWIW: Rds with gate @ 5V (measured with multimeter across drain and source
probably not the right way) is 8+ megOhm although that's not not what the drain current is telling me.
Rds with gate @ 0V ~ 0.1 ohm
Voltage drop across drain and source, gate @ 5V = 200 - 3000mV
Voltage drop across drain and source, gate @ 0V ~ 0mV
Voltage at drain, gate @ 5V = 2 - 4.7V, corresponds with above figure
Voltage at drain, gate at 0V = 5V