What the ADUM6402CRWZ-RL does on the board
The ADUM6402CRWZ-RL is a quad-channel digital isolator from Analog Devices' IsoPower and iCoupler series that integrates an isolated DC-DC converter on-chip. It provides 5000Vrms galvanic isolation across four unidirectional channels — two from Side 1 to Side 2, two from Side 2 to Side 1 — using magnetic coupling technology.
The 5000Vrms isolation voltage rating qualifies this part for reinforced insulation in medical (IEC 60601) and industrial (IEC 61010) applications where a single-fault condition must not create a safety hazard. The 25kV/µs common-mode transient immunity means the output logic state holds steady when a fast high-voltage transient — like the switching edge in a motor-drive inverter or a lightning surge on a field cable — slams the isolation barrier. In practice, this CMTI number keeps the data link from bit-flipping in noisy environments where a lower-rated isolator would glitch.
25Mbps data rate and propagation delay — sizing the timing budget
The 25Mbps data rate supports SPI clocks up to 12.5 MHz (half-duplex), UART at standard baud rates, and general-purpose GPIO isolation. The maximum propagation delay of 60ns in either direction and pulse-width distortion of 6ns are tight enough that a 25Mbps NRZ signal retains adequate eye opening across the barrier. If your bus runs faster than 25Mbps — say, a 50 MHz SPI — this part will not close timing; step up to a higher-rate isolator family.
Package and footprint — 16-SOIC wide-body
The wide-body gives the creepage distance needed to sustain the 5000Vrms rating — standard SOIC-16 narrow (3.90 mm) would not pass. The Tape & Reel suffix (-RL) means it ships on 13-inch reels, typical for volume production.
If your application requires 125°C ambient (under-hood automotive, downhole tools), the ADUM5402WCRWZ-1RL carries an automotive-grade variant with the same 25Mbps data rate but lower 2500Vrms isolation.