# How many excess electrons are in a modern SLC flash memory cell?

A colleague told me that in a modern SLC flash memory cell there are about 400 electrons.

However, I can't find any reference to this.

Flash memory cells can be thought of as little buckets of electrons on the floating gate of a transistor. When they have enough excess electrons, the transistor switches. The gate floats, so the transistors don't drain away.

I'm looking for a reference to how many electrons are in a modern SLC flash memory cell.

EDIT: More references:

• How many atoms are in the cell and how many electrons does each of those atoms have? Jun 13, 2020 at 15:11
• Probably closer to 40,000 but next year this might be 20,000 and so nobody's going to really be able to produce an answer that survives the test of time. How much capacitance does a floating gate have? How much voltage (take a guess at 5 volts).... Q=CV etc.. Jun 13, 2020 at 15:27
• Hi @Andyaka, can you provide a reference for 40,000?
– vy32
Jun 13, 2020 at 15:28
• I guessed based on 1 fF gate capacitance and a gate charge voltage of 5 volts. Jun 13, 2020 at 15:29