RS232 to TTL level convertor

RS232 to TTL level converter
When developing a product that communicates over RS-232 it happens frequently that the product uses TTL levels. The serial (COM) port of a PC uses RS232 levels, so a level converter is required. This RS232 to TTL level converter solves this problem in a convenient way.

The level converter is a standard component, but needs some circuitry to be useable. We use the ICL3221 in a TSOP package.

On the PCB 3 LED’s are mounted to indicate power supply, Rx and Tx. This level converter is suited for 3-wire communication only: Rx, Tx and ground. The device needs an external DC 3.0 to 5.0 V power supply.

RS232 to TTL stamp assembly

RS232 to TTL level converter with D Sub hood
The circuit is as small as a real stamp and it will fit in most (long type) D-sub hoods. This hood can be ordered separately from us or from Farnell.


You can download more information about the RS-232 to TTL level converter below:
Schematic and component layout of the RS232 to TTL level converter(165 kB)

More RS232 information

A lot of information about RS232 can be found on the Internet but most of that is fragmented. A source that has gathered a lot of very useful information can be found here (RS232 information, English).


On the order page you can find out how to order this product.

If you have any questions or suggestions, please feel free to contact us.