The ADUM3400CRWZ is a 4-channel, unidirectional digital isolator from Analog Devices' iCoupler series, using magnetic coupling to pass signals across a 2500 Vrms isolation barrier. The 4/0 input-to-output channel arrangement means all four channels run from side 1 to side 2 — no reverse-direction channels. This part sits in industrial automation, motor drives, medical equipment, and any isolated data interface where you need to move digital signals across a safety barrier without an isolated power supply on the secondary side.
Package and mounting
The 90 Mbps data rate covers SPI, UART, and parallel bus isolation up to about 45 MHz clock. The 25 kV/µs common-mode transient immunity (CMTI) is the spec that matters in noisy environments — motor drives, inverter legs, and industrial fieldbus where fast voltage transients couple across the barrier. If the CMTI is too low, the output glitches or latches. At 25 kV/µs minimum, this part handles the dV/dt from a typical IGBT switching leg without hiccup. Rise and fall times are a symmetric 2.5 ns typical, which keeps signal integrity clean on short PCB traces.
Supply range and temperature — field-fit check
No isolated power output — this is a pure signal isolator; you supply Vdd on both sides separately.