I'm looking for replacement for ADM2587E.

This is ADM2587E:

enter image description here

Can I just use cheap, not isolated RS485 transceiver like MAX485 connected to microcontroller TX, RX, DE/_RE via optocouplers and power it from isolated supply?

I realize, that it will take more space on PCB, but are there some other side-effects? Circuit is used for low speed communication (max baud rate is 38400).

  • 2
    \$\begingroup\$ Sure you could, if you properly design it. \$\endgroup\$ Jun 10, 2022 at 18:40
  • \$\begingroup\$ Even without optos its possible. Analog Devices has some ICs in the same series (ADuM?) that are digital Isolators WITH isolated power. So 2 ICs only, ADuM + RS485. Same goes for other manufacturers, TI, etc. \$\endgroup\$
    – Wesley Lee
    Jun 10, 2022 at 18:47
  • \$\begingroup\$ It is possible so it depends how you design it. \$\endgroup\$
    – Justme
    Jun 10, 2022 at 18:59

1 Answer 1


Of course you can, as long as the digital isolators (e.g. optos) are fast enough for the baudrate you'll use.


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