Four-channel isolator with onboard isolated DC-DC
The ADUM5404ARWZ is a four-channel, unidirectional digital isolator from Analog Devices that integrates an isolated DC-DC converter on-chip, eliminating the need for a separate isolated power supply on the secondary side. It uses magnetic coupling (iCoupler technology) and is part of the IsoPower family, meaning the same package delivers both signal isolation and isolated power. This part is rated for 2500Vrms isolation and a data rate of 1Mbps, with propagation delays of 100ns max in either direction.
2500Vrms isolation and 25kV/µs CMTI — what they mean for a motor-drive or industrial bus
The 2500Vrms isolation rating is the basic safety isolation level for many industrial and medical applications, sufficient for reinforced insulation in mains-connected equipment where the working voltage stays under 250V. The 25kV/µs common-mode transient immunity (CMTI) is the critical spec for motor-drive and inverter environments: it means the isolator will not falsely toggle when the motor phase voltage slews at high dV/dt, keeping the control-side logic clean. If your system sees fast switching edges from IGBTs or SiC MOSFETs, this CMTI number is the one that keeps the bus from glitching.
1Mbps data rate and 100ns propagation delay — bus timing budget
At 1Mbps, this isolator is sized for standard UART, SPI (up to a few MHz), and general-purpose digital I/O isolation. The 100ns max propagation delay (tpLH/tpHL) and 40ns max pulse-width distortion mean the signal duty cycle is preserved within a few percent at 1Mbps, so it works for PWM signals and encoder outputs without needing a separate clock recovery. For faster interfaces like 10MHz SPI or CAN FD, look at the higher-speed variants in the ADuM family; for 1Mbps isolated power and signal in one package, this is the fit.
The part is ROHS3 compliant.