5000Vrms isolation in a 16-pin SOIC — the iCoupler® workhorse
The ADUM2400CRWZ-RL is a 4-channel, unidirectional digital isolator from Analog Devices' iCoupler® family. The part is rated for a 90Mbps data rate with 32ns max propagation delay and 2ns pulse-width distortion, so it handles full-speed USB and most serial protocols without timing trouble. Supply range is 2.7V to 5.5V on a single rail, which means it can sit on either a 3.3V or 5V domain without a separate regulator.
The 90Mbps data rate is fast enough for isolated SPI (up to 40-50 MHz clock), UART at any common baud rate, and CAN or RS-485 transceiver isolation. The 32ns max propagation delay is symmetric (32ns both directions), so you don't get duty-cycle distortion from the isolator itself. The 2ns pulse-width distortion means a 50% duty-cycle input emerges still close to 50% — important for PWM signals or clock distribution across the isolation barrier. Common-mode transient immunity (CMTI) is rated at a minimum of 25kV/µs. That's the part's ability to reject fast voltage spikes that couple capacitively across the barrier. In a motor drive with IGBTs switching at 10-20 kHz, those spikes are exactly what corrupt data if the isolator is weak. 25kV/µs is a strong spec for industrial and automotive environments.
4 unidirectional channels — all inputs on side 1
The channel configuration is 4/0 — all four channels are unidirectional with their inputs on side 1 and outputs on side 2. That means this part is designed to pass signals in one direction only, from the primary-side logic to the secondary-side load. If you need bidirectional isolation (e.g., for a half-duplex RS-485 bus), you would use a different variant in the ADUM2400 family that has a mix of input/output directions. For a simple isolated data stream — sensor output to controller, or controller command to driver — this 4/0 arrangement is exactly what you want.
Active lifecycle, ROHS3, and industrial temperature range
The package is a 16-SOIC wide-body (7.50mm width), which provides the creepage distance needed to maintain the 5000Vrms isolation rating across the PCB.