Three-channel isolation in a 16-SOIC wide body
The ADUM1311BRWZ-RL is a three-channel digital isolator from Analog Devices' iCoupler family, using magnetic coupling to transfer digital signals across a 3750Vrms isolation barrier. Two channels are configured from Side 1 to Side 2, and one channel runs from Side 2 to Side 1 — a 2/1 unidirectional split that suits applications like isolated SPI where you need MISO, MOSI, and a clock or chip-select in the opposite direction. The part handles data rates up to 10Mbps with 50ns max propagation delay and 5ns pulse-width distortion, so it fits UART, SPI, and general-purpose logic isolation without timing margin headaches.
The 3750Vrms isolation rating is the withstand voltage for basic insulation. In a motor drive or industrial PSU, that covers the reinforced isolation requirement for 300V working voltage systems. The 25kV/µs common-mode transient immunity (CMTI) is the spec that matters when you place this isolator between a noisy power stage and a sensitive controller — fast-switching SiC or IGBT edges can couple several kV/µs across the barrier, and if the isolator's CMTI is too low, data corrupts or the output latches. At 25kV/µs minimum, this part handles the transients from a typical 600V/30A inverter leg without bit errors.
Both sides of the isolator run from a single 2.7V to 5.5V supply, so you can interface a 3.3V MCU to a 5V peripheral without a level shifter — the part handles the voltage translation internally. The 16-SOIC wide-body package (7.50mm body width) gives the creepage distance needed for the 3750Vrms rating.