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IC for galvnics isolation USB?

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berger.h

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I'm looking, how isolate USB bus between PC and MCU with USB.
I know ADUM4160B, but this solution is expensive 10Euro and i need cheaper IC around 1Euro.
There is something like that<
 

Most modern AC adapters have one opto isolated transistor inside, but for the sake of USB I can't say if it's fast enough. But at least it is cheap as you will probably find one or several in electric waste bin.
 

Isolators in general seem to be expensive (custom
processing, smallish market) but you might find a
better price-point by (say) using a cheapest 5V
logic isolator (or 3.3, 2.5V) and a dirt cheap LVDS
Tx / Rx chip (depending on application). Insisting
on the combo cuts your supply base with predictable
pricing consequences.

And of course there's the question of how much
isolation voltage you truly need (if any).

If a minimum transition density can be guaranteed
on the serial lanes then simpler solutions (like pulse
xfmr, DC-blocked) might apply.
 

An USB isolator implements a special circuit on both sides translating the bidirectional USB signal into unidirectional signals to be transferred by multiple couplers. That's far from being easy and can't be implemented much cheaper than by the Analog Devices chip.

Read USB full speed protocol specification (USB V1.1) to understand the problem.
 

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