The ADUM6403ARWZ is a quad-channel digital isolator from Analog Devices' IsoPower and iCoupler series that integrates an isolated DC-DC converter on-chip. That means it can provide a regulated, isolated output voltage from its own internal oscillator and transformer — no separate isolated power module needed on the secondary side. The part is rated for 5000Vrms isolation and a minimum common-mode transient immunity of 25kV/µs, which puts it squarely in the industrial motor-drive and inverter class where high-voltage transients are the norm. The 1Mbps data rate with 100ns max propagation delay is fine for SPI, UART, and general-purpose GPIO isolation, but not for high-speed interfaces like CAN (typically 1Mbps but tighter timing) or full-speed USB.
Channel direction and supply voltage — getting the fit right
The channel arrangement is 1 input on Side 1 (the primary side) and 3 inputs on Side 2 (the isolated side). The supply range is 3V to 5.5V on both sides, so 3.3V or 5V logic rails work without a separate level shifter — but both sides must be powered within that window; the IsoPower converter generates its own isolated rail internally, not from an external secondary supply.
Housed in a 16-SOIC wide-body package (7.50mm width) with surface-mount termination. The IsoPower converter runs its own internal switching at a few hundred kilohertz, so the usual SOIC-16 thermal dissipation applies — no exposed pad, so the junction-to-ambient path is through the leads and board copper. For continuous operation near 105°C ambient, ensure adequate copper pour on the secondary side to spread the converter's dissipation.