# Can I use a diode as a level shifter, and which way should it be?

RXD_5V is connected to RXD with a diode labelled 1n4148.

But in my mind I imagine the diode would be facing the other direction. What am I missing please?

• What do you actually want to do? – Transistor Jul 4 '16 at 17:51
• Be safe that I don't fry my 3v microcontroller by reading from a 5v serial signal on an FTDI breakout. – Ali Afshar Jul 5 '16 at 19:50