Ok, I have never used iCouplers in designs. But I have designed extensively with transformer based isolation barriers and it seems that is the core of iCouplers (but their transformers are monolithic, I believe).
My experiences:
I get a lot of bandwidth out of transformers. And a whole lot more speed per Dollar compared to opto couplers. No rising/falling edge problems. But best of all, transformers are generic. That means that it is unlikely that your purchasing chief comes running down the hallway with a red face because some part suddenly has become unavailable.
Analog Devices is usually very dependable but I still would have an uneasy feeling about any single sourced part. I'd rather take a #43 toroid with a couple of windings. Ferrite hasn't ever gone on allocation in my 20 years of design work. Neither has wire.
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