I’m redesigning two different Arduino circuits, into one. Both drive external relays. In re-designing, I’m looking for some Opto-Isolators that will drive the relays directly (no external transistors) so I need optos that can source and sink about 200 ma. (Actual requirements are less, but I want some safety margin.)
First is currently a NANO, drives an 8 Channel 5V Relay Shield Module Board for Arduino. I use them to provide a switched 12v to the external DC antenna relays. (About 60 ma each).
The second is currrently a MEGA (using 2 RS232 comm ports) and drives a series of 4N35 OptoIsolators to provide the necessary logic to drive relays (2 in this case, each about 60 ma, 120 ma total per circuit). These require a pull down to gnd to activate the relays. Because of the higher current, I added an NPN transistor to each output.
Because one set of relays requires 12v to activate, I need a PNP output opto, and the other set of relays requires a pull down to activate, I need an NPN output opto also.
How do I go about finding an pair of OptoIsolators to meet my needs?
Thanks in advance!