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ISO3082: replacing ISO3080DWR with ISO3082DWR

Diego Bolzoni
Prodigy 30 points
Part Number: ISO3082
Other Parts Discussed in Thread: ISO3080, , ISO1452, ISO1412, ISO1432

Good morning,

we usually mount on our products as RS485 transceiver the ISO3080DWR.

Following the schematic

The ISO3080DWR is a full duplex tranceiver, but we are using it in HALF DUPLEX MODE.

Now, for availability reasons, I'm evaluating the ISO3082DWR (which is an half duplex).

Following the pinout difference:


What does the datasheet mean for pin 11 and pin 14?

Are not internally connected and so I can use my PCB (without modifications on the external connections)?

Or connecting pin11 with pin 14 and pin 12 with pin 13 the ISO3082DWR doesn't work correcty or it is possible to damage it?

Please let me know as soon as possible.

Best regards.

Diego Bolzoni 

  • 0
    TI__Guru 53545 points

    Hi Diego,

    Thanks for reaching out and for using ISO3080 in your design.

    The NC pins 11 and 14 of ISO3082 are internally "Not Connected" and hence, connecting them to any other pin doesn't affect device operation.
    Unfortunately, pins 12 of the two devices are not compatible with each other. It is Z for ISO3080 and A for ISO3082 which shouldn't be connected together. Replacing ISO3082 onto ISO3080 footprint will create a short on RS-485 bus due to shorting of A and Z.

    You could possibly look at ISO1412, ISO1432 and ISO1452 which are pin-compatible to ISO3080. If these devices are available, then you could use them. Thanks.


    Regards,
    Koteshwar Rao