What this isolator does in the assembly
The ADUM1401CRWZ-RL is a 4-channel digital isolator from Analog Devices' iCoupler series, using magnetic coupling to pass signals across a 2500Vrms isolation barrier. The 3/1 input-to-output split (three channels forward, one reverse) suits designs that need a feedback path — like an enable or fault signal — without adding a second isolator.
The ADUM1401CRWZ-RL supports a data rate of 90 Mbps. Rise/fall times are 2.5 ns typical.
For a production line that needs a stable BOM through the next several years, this part is not a sourcing risk.