Transistor Based Level Shifter

One of the simplest designs I’ve found for level shifting is just tying 2 NOT gates together. The nice thing about a NOT gate is it can be made with a single transistor, which means we can make a level shifter with only 2 transistors and a couple resistors to limit current.

I use these 2 designs often since 3.3v and 5v are really common in the parts I used, but this same circuit can be used for higher voltages by modifying the resistors (I’ve even used these resistor values with higher and lower voltages and it still worked fine, but your mileage may vary).

3v3 to 5v

5v to 3v3

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