I am using the 2N7000BU Enhancement MOSFET to control a 5 VDC signal to a relay with a 3.3 VDC gate voltage applied.
Vds max is 60 V and Vgs(th) is ~800 mV with a +/- 20 V max. and a max. drain current of 200 mA. I have it connected to a Solid State Relay with a 4-32 V input voltage and a maximum of 20 mA current draw.
The diagram appears to show that left is the source and right is the drain. I tested the pins with nothing connected to the gate with a multimeter and it shows no connection between 1 and 3.
When I connect my +5 V to the drain and -5 V to the source with nothing at the gate there is no current flow initially, but after powering the gate with 5 V it does not turn off on its own: when the 5 V is removed it takes a few seconds to turn off. After that, even gently brushing the gate pin with my finger causes the relay light to turn on and remain stuck.
I would really appreciate some help troubleshooting why this is not working as expected.