Quad-channel isolator with onboard DC-DC — what it saves on the BOM
The ADUM5404ARWZ-RL is a quad-channel digital isolator from Analog Devices' IsoPower and iCoupler family. What sets it apart from a plain isolator is the integrated, isolated DC-DC converter — it generates a regulated output voltage on the isolated side without needing a separate transformer or module. That saves board space and simplifies the power architecture in designs where you need signal isolation plus a clean isolated rail for sensors, ADCs, or a secondary microcontroller. The four channels are all unidirectional and arranged as 0 inputs on side 1 and 4 inputs on side 2 — meaning all four channels drive from the secondary (isolated) side back to the primary. This directionality suits applications where an isolated sensor or ADC sends data back to a main controller.
2500Vrms isolation and 25kV/µs CMTI — where it holds the line
Rated at 2500Vrms for one minute, this isolator covers the basic reinforced isolation needed for motor-drive control signals, PLC digital inputs, and medical patient-monitoring interfaces. The 25kV/µs common-mode transient immunity means the data path stays clean when a nearby IGBT switches or a relay coil de-energizes — no false edges on the output. Propagation delay is 100ns max in either direction, with pulse-width distortion held to 40ns. At 1Mbps the timing budget is comfortable for SPI clock rates up to a few MHz and for most UART or GPIO handshake lines. Rise and fall times are 2.5ns typical, which keeps the signal edges sharp enough for a 16-SOIC layout without excessive ringing.
Supply range and temperature — industrial fit
Operates from 3V to 5.5V on both sides, so it can bridge a 3.3V controller to a 5V sensor rail or vice versa.
ADI lists the ADUM5404ARWZ-RL as Active.