Three downstream channels, one upstream controller — what the 3/0 input mapping means for your bus
The ADUM3300BRWZ is a 3-channel unidirectional digital isolator from Analog Devices' iCoupler family, built with magnetic coupling technology. All three channels are oriented side 1 to side 2 (3/0 input count), so it isolates three downstream signals — SPI chip-select, data, and clock, for example — from a single upstream controller without reverse-direction capability. The 10 Mbps data rate handles most industrial serial buses (SPI up to 10 MHz, UART at 1 Mbps, CAN at 1 Mbps) with margin, while the 2500 Vrms isolation rating provides basic insulation for equipment operating on 240 VAC mains or in noisy factory-floor environments where ground loops are a concern. The 25 kV/µs common-mode transient immunity keeps data intact when adjacent motor drives or inverters slam the isolation barrier with fast dv/dt edges — a spec that matters more than the headline voltage rating in high-noise installations.
Propagation delay is 50 ns max with 3 ns pulse-width distortion, tight enough for clocked interfaces where skew budget is tight.
That said, the 16-SOIC wide-body package is shared across multiple iCoupler variants, so if a future PCN shifts fab or assembly site, the form-fit-function risk is low — the package and pinout are stable across the family.
Sourcing and verification notes for the procurement desk
Because the ADUM3300BRWZ is a current-production part with no EOL risk, the main sourcing concern is date-code consistency and avoiding re-marked stock. The laser-etched marking on the 16-SOIC body should match ADI's plant-and-week format — any sanded or re-inked surface is a red flag.