What this 4-channel iCoupler brings to the board
The ADUM241E0BRWZ is a 4-channel digital isolator from Analog Devices' iCoupler family, built around magnetic coupling technology. Three channels run Side 1 to Side 2; the fourth goes the other way, which maps neatly to a three-wire SPI plus a single back-channel interrupt or enable line. The 16-pin SOIC wide-body (7.50 mm width) gives you the creepage distance for the 5000 Vrms rating without needing a slot in the PCB.
At 150 Mbps the part handles full-speed SPI clock rates and most parallel data buses without adding a wait state. The 13 ns propagation delay, matched on both edges, keeps the pulse-width distortion under 3 ns — that's tight enough that a 10 MHz SPI bus won't see duty-cycle skew that eats setup time. Rise and fall times are 2.5 ns typical, which is fast enough to need controlled-impedance traces if the run exceeds a couple inches. The 75 kV/µs CMTI means it won't glitch when a 1200 V IGBT switches next to it — a common failure point in motor drives and inverters where older optocouplers would hiccup.