5000Vrms isolation in a 16-SOIC — what it buys you
The ADUM2402BRIZ is a 4-channel, unidirectional digital isolator from the iCoupler family, built with magnetic coupling technology. Data rate is rated at 10Mbps, which comfortably handles most serial protocols up to full-speed SPI without timing margin issues. Propagation delay is 50ns max (both directions), and pulse-width distortion holds to 3ns max — tight enough for synchronous interfaces where skew between channels matters. Supply voltage spans 2.7V to 5.5V on both sides, so it can bridge 3.3V and 5V logic domains without a separate level shifter. The wide range also helps during power-up sequencing: either side can come up first without latch-up or excessive current draw.
25kV/µs CMTI — why it matters for motor drives and inverters
Common-mode transient immunity is rated at 25kV/µs minimum. In a variable-frequency drive, the IGBT switching edges can slam several hundred volts across the isolation barrier in a few nanoseconds. If the isolator's CMTI is too low, those edges couple through as data errors or latch-up. At 25kV/µs the ADUM2402BRIZ handles the typical 600V/µs to 1500V/µs transients in industrial drives with margin to spare. Rise and fall times are 2.5ns typical — fast enough to preserve signal integrity at 10Mbps but not so fast that they radiate excessively. Pair with a solid ground plane under the SOIC and a 100nF decoupling cap per supply pin, as close as the layout allows.
Channel configuration and temperature range
Four unidirectional channels are arranged as two inputs on side 1 and two inputs on side 2. That split suits half-duplex interfaces (e.g., RS-485 with separate DE and RE) or mixed-direction sensor isolation where a few signals need to cross the barrier in each direction. No isolated power is integrated — each side needs its own supply rail.