I²C bus isolation in an 8-SOIC footprint
The SI8600AB-B-ISR is a 2-channel bidirectional I²C digital isolator from Skyworks Solutions, built with capacitive coupling technology. It provides 2500Vrms galvanic isolation between the I²C bus segments, with both channels operating bidirectionally — meaning the SDA and SCL lines each carry data in both directions across the isolation barrier without needing a separate direction-control pin.
Common-mode transient immunity is specified at a minimum 35 kV/µs — this is the rate of voltage slew between the two isolated grounds that the part can reject without corrupting the I²C data. In a motor-drive or inverter application where the switching node slews at 10–20 kV/µs, the 35 kV/µs margin keeps the bus from seeing false start/stop conditions. No derating is needed for ambient temperatures up to 125°C, though the junction-to-ambient thermal resistance of the SOIC-8 package (typically 120–150 °C/W) should be checked against the total power dissipation at the high end.