On a previous question I just asked it was about storing an led's previous state with the eeprom. Without a microcontroller, it seemed not possible, so now Im asking if you can buy single floating gate transistors anywhere, because I have searched, and nothing showed up. Do they even make this?


1 Answer 1


Buy a normal FET, leave the gate unconnected. You now have a floating gate transistor :)

Less flippantly, this is actually one of the answers suggested to your previous question: connect a capacitor to the gate of a FET with some way of charging and discharging it. If you design the circuit to minimise the current leakage off the capacitor and use a large capacitor, you can store a bit for a long time.

  • \$\begingroup\$ Only if its a MOSFET ... a JFET gate probably doesn't float freely enough. But ... :-) \$\endgroup\$
    – user16324
    Commented Nov 29, 2012 at 13:46
  • 1
    \$\begingroup\$ wow I am here 10 years later does this actually work? \$\endgroup\$
    – Chadley123
    Commented Oct 30, 2022 at 4:54

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