Three channels, all forward — where the 3/0 direction matters
The ADUM230E1BRIZ is a 3-channel unidirectional digital isolator from Analog Devices' iCoupler series, built with magnetic coupling technology. All three channels drive from Side 1 to Side 2 (3/0 input/output split), making it a clean fit for forward-only data paths like SPI clock-and-data lines, isolated UART TX, or GPIO expansion where no feedback channel is needed. The 150 Mbps data rate handles most serial protocols without timing pressure — SPI at 50 MHz, UART at several Mbps, or CAN at 1 Mbps all pass with margin. The 5000 Vrms isolation rating is sized for reinforced insulation in motor drives, industrial PSUs, and medical equipment where the safety barrier must hold off mains transients.
5000 Vrms and 75 kV/µs CMTI — the margin for noisy environments
The 5000 Vrms isolation voltage is the headline spec that defines this part's application space. It provides reinforced insulation for equipment connected to mains or high-voltage DC links — motor drives, solar inverters, medical patient-contact interfaces, and industrial sensors with long cable runs. The 75 kV/µs common-mode transient immunity (CMTI) is equally important in those environments: fast-switching IGBTs and SiC MOSFETs can couple several kV/µs across the isolation barrier, and if the isolator cannot reject that dV/dt, data bits get corrupted. The ADUM230E1BRIZ's CMTI rating of 75 kV/µs (minimum) keeps the output state stable through those events.
That simplifies the BOM and saves board area — the isolator itself handles the voltage translation. The 1.7 V minimum also covers the lower end of 1.8 V logic (which can droop to 1.6 V under load) with margin. Propagation delay is 13 ns max (both tpLH and tpHL), and pulse-width distortion stays under 3 ns, so timing skew across channels is tight enough for parallel buses like SPI with multiple chip selects.