Need hardware advice: ULN2003A

[Luciano]

Hi,

There is no CMOS or TTL version for the ULN2003A.
If the relay is 12V, connect +12V to the pin 9.
If the relay is 48V, connect +48V to the pin 9.
(The outputs of the ULN2003A work up to 50V).

What you see on the datasheet (Fig. 18 and 19) is
what you have when the input of ULN2003A is connected
to a CMOS IC or a TTL IC. What you see on the left of
fig. 19 represents an output inside a TTL IC. What you
see on the left of fig. 18 represents an output inside
a CMOS IC.

On the first page of the datasheet you car read
"Inputs Compatible with various types of logic".

Best regards,

Luciano